СПИСОК патентов США - подгруппа МПК16 H04M9/08
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| № п/п | Номер патента | Название патента | |||
2017 | |||||
| 1 | 9609141 | Loudspeaker localization with a microphone array | |||
| 2 | 9602923 | Estimating a room impulse response | |||
| 3 | 9602922 | Adaptive echo cancellation | |||
| 4 | 9596541 | Post-filter for handling resonance-induced echo components | |||
| 5 | 9591123 | Echo cancellation | |||
| 6 | 9589556 | Energy adjustment of acoustic echo replica signal for speech enhancement | |||
| 7 | 9584642 | Apparatus with adaptive acoustic echo control for speakerphone mode | |||
| 8 | 9578161 | Method for metadata-based collaborative voice processing for voice communication | |||
| 9 | 9564147 | Audio communication system, audio communication method, audio communication purpose program, audio transmission terminal, and audio transmission terminal purpose program | |||
| 10 | 9562970 | Proximity detecting apparatus and method based on audio signals | |||
| 11 | 9558758 | User feedback on microphone placement | |||
| 12 | 9552827 | Echo control through hidden audio signals | |||
| 13 | 9549079 | Acoustic echo cancellation for microphone array with dynamically changing beam forming | |||
| 14 | 9544702 | Dynamic characterization of a communication device | |||
| 15 | 9544442 | Lingering cancellation for data encoded audio signals | |||
| 16 | 9544422 | Acoustic echo suppression | |||
| 17 | 9542957 | Procedure and mechanism for controlling and using voice communication | |||
| 18 | 9538299 | Acoustic echo cancellation (AEC) with conferencing environment templates (CETs) | |||
| 19 | 9538283 | Ear microphone | |||
2016 | |||||
| 20 | 9531433 | Echo cancellation methodology and assembly for electroacoustic communication apparatuses | |||
| 21 | 9530428 | Echo cancellation device | |||
| 22 | 9521264 | Echo removal | |||
| 23 | 9521249 | Echo path change detector with robustness to double talk | |||
| 24 | 9520139 | Post tone suppression for speech enhancement | |||
| 25 | 9516159 | System and method of double talk detection with acoustic echo and noise control | |||
| 26 | 9509854 | Echo cancellation | |||
| 27 | 9509852 | Audio acoustic echo cancellation for video conferencing | |||
| 28 | 9508359 | Acoustic echo preprocessing for speech enhancement | |||
| 29 | 9503815 | Perceptual echo gate approach and design for improved echo control to support higher audio and conversational quality | |||
| 30 | 9503812 | Systems and methods for split echo cancellation | |||
| 31 | 9497330 | Signal processing method, signal processing device, and signal processing program | |||
| 32 | 9491545 | Methods and devices for reverberation suppression | |||
| 33 | 9491306 | Signal processing control in an audio device | |||
| 34 | 9484011 | Echo modulation methods and system | |||
| 35 | 9479650 | Methods and devices for updating filter coefficients during echo cancellation | |||
| 36 | 9473646 | Robust acoustic echo cancellation | |||
| 37 | 9473645 | Audio quality in teleconferencing | |||
| 38 | 9467571 | Echo removal | |||
| 39 | 9462116 | Reducing the feedback overhead during crosstalk precoder initialization | |||
| 40 | 9461702 | Systems and methods of echo and noise cancellation in voice communication | |||
| 41 | 9451078 | Universal reconfigurable echo cancellation system | |||
| 42 | 9449615 | Externally estimated SNR based modifiers for internal MMSE calculators | |||
| 43 | 9449593 | Detecting nonlinear amplitude processing | |||
| 44 | 9445196 | Inter-channel coherence reduction for stereophonic and multichannel acoustic echo cancellation | |||
| 45 | 9443530 | Acoustic echo cancellation | |||
| 46 | 9443528 | Method and device for eliminating echoes | |||
| 47 | 9438308 | Echo cancellation with quantization compensation | |||
| 48 | 9437210 | Audio signal processing | |||
| 49 | 9437179 | Reverberation suppression device | |||
| 50 | 9432219 | Voice energy collision back-off | |||
| 51 | 9426300 | Matching reverberation in teleconferencing environments | |||
| 52 | 9426279 | Systems and methods for echo cancellation and echo suppression | |||
| 53 | 9420390 | Estimation and suppression of harmonic loudspeaker nonlinearities | |||
| 54 | 9420115 | Method using array microphone to cancel echo | |||
| 55 | 9420114 | Echo canceller for VOIP networks | |||
| 56 | 9414162 | Systems and methods for echo reduction | |||
| 57 | 9414158 | Single-channel, binaural and multi-channel dereverberation | |||
| 58 | 9413478 | Method and systems for reducing crosstalk | |||
| 59 | 9413434 | Cancellation of interfering audio on a mobile device | |||
| 60 | 9407320 | Detection of double talk in telecommunications networks | |||
| 61 | 9401996 | Synchronizing audio signal sampling in a wireless, digital audio conferencing system | |||
| 62 | 9401995 | Method and arrangement for echo cancellation in conference systems | |||
| 63 | 9392379 | Output phase modulation entrainment containment for digital filters | |||
| 64 | 9386162 | Systems and methods for reducing audio noise | |||
| 65 | 9385674 | Dynamic speaker management for multichannel audio systems | |||
| 66 | 9380150 | Methods and devices for automatic volume control of a far-end voice signal provided to a captioning communication service | |||
| 67 | 9379770 | Methods and systems for activating and deactivating communication paths | |||
| 68 | 9374453 | Audio processing for multi-participant communication systems | |||
| 69 | 9369557 | Frequency-dependent sidetone calibration | |||
| 70 | 9363600 | Method and apparatus for improved residual echo suppression and flexible tradeoffs in near-end distortion and echo reduction | |||
| 71 | 9363386 | Acoustic echo cancellation based on ultrasound motion detection | |||
| 72 | 9361874 | Varying adaptive filter step size in acoustic echo cancellation | |||
| 73 | 9357080 | Spatial quiescence protection for multi-channel acoustic echo cancellation | |||
| 74 | 9352701 | Managing telephony and entertainment audio in a vehicle audio platform | |||
| 75 | 9349363 | Audio signal processing system and echo signal removing method thereof | |||
| 76 | 9344579 | Variable step size echo cancellation with accounting for instantaneous interference | |||
| 77 | 9344050 | Dynamic speaker management with echo cancellation | |||
| 78 | 9338304 | Bidirectional communication system and method for compensating for undesired feedback in the bidirectional communication system | |||
| 79 | 9338278 | Determining the distance and/or acoustic quality between a mobile device and a base unit | |||
| 80 | 9336792 | Systems and methods for voice enhancement in audio conference | |||
| 81 | 9330682 | Apparatus and method for discriminating speech, and computer readable medium | |||
| 82 | 9330650 | Sound masking device and sound masking method | |||
| 83 | 9325855 | Echo elimination device and method for miniature hands-free voice communication system | |||
| 84 | 9325854 | Structure and method for echo reduction without loss of information | |||
| 85 | 9319791 | Reduced-delay subband signal processing system and method | |||
| 86 | 9319783 | Attenuation of output audio based on residual echo | |||
| 87 | 9319532 | Acoustic echo cancellation for audio system with bring your own devices (BYOD) | |||
| 88 | 9319510 | Personalized bandwidth extension | |||
| 89 | 9318123 | Apparatus and method for reproducing sound, and method for canceling a feedback signal | |||
| 90 | 9312913 | Echo cancellation apparatus, echo cancellation method and communications apparatus | |||
| 91 | 9307334 | Method for calculating audio latency in real-time audio processing system | |||
| 92 | 9307318 | Audio processor circuits for acoustic echo cancellation and method therefor | |||
| 93 | 9301048 | Signal processing method, signal processing device, and signal processing program | |||
| 94 | 9293148 | Reducing noise in a shared media session | |||
| 95 | 9288578 | Method and apparatus for canceling acoustic echo, and method for updating adaptive filter coefficient by the apparatus | |||
| 96 | 9288576 | Dereverberation parameter estimation device and method, dereverberation/echo-cancellation parameter estimation device, dereverberation device, dereverberation/echo-cancellation device, and dereverberation device online conferencing system | |||
| 97 | 9286881 | Echo canceler and echo detector | |||
| 98 | 9282196 | Moving a sound localization point of a computer program during a voice exchange | |||
| 99 | 9282195 | Echo canceller and echo cancellation method | |||
| 100 | 9280983 | Acoustic echo cancellation (AEC) for a close-coupled speaker and microphone system | |||
| 101 | 9277059 | Echo removal | |||
| 102 | 9275625 | Content based noise suppression | |||
| 103 | 9270830 | Echo canceller for VOIP networks | |||
| 104 | 9264807 | Multichannel acoustic echo reduction | |||
| 105 | 9264805 | Method for determining a set of filter coefficients for an acoustic echo compensator | |||
| 106 | 9264553 | Methods and apparatuses for echo cancelation with beamforming microphone arrays | |||
| 107 | 9258410 | Methods and systems for determining crosstalk for a joining line in a vectored system | |||
| 108 | 9246545 | Adaptive estimation of delay in audio systems | |||
| 109 | 9237241 | Voice packet dynamic echo cancellation system | |||
| 110 | 9237226 | Controlling echo in a wideband voice conference | |||
| 111 | 9237225 | Apparatus with dynamic audio signal pre-conditioning and methods therefor | |||
| 112 | 9232072 | Participant controlled spatial AEC | |||
| 113 | 9232071 | Optimizing audio processing functions by dynamically compensating for variable distances between speaker(s) and microphone(s) in a mobile device | |||
| 114 | 9231656 | System and method to reduce crosstalk of digital subscriber lines | |||
2015 | |||||
| 115 | 9225843 | Method, system and computer program product for acoustic echo cancellation | |||
| 116 | 9225842 | Determining an acoustic coupling between a far-end talker signal and a combined signal | |||
| 117 | 9224393 | Noise estimation for use with noise reduction and echo cancellation in personal communication | |||
| 118 | 9219958 | Systems and methods for acoustic echo cancellation with wireless microphones and speakers | |||
| 119 | 9219456 | Correcting clock drift via embedded sin waves | |||
| 120 | 9215328 | Beamforming apparatus and method based on long-term properties of sources of undesired noise affecting voice quality | |||
| 121 | 9215327 | Methods and apparatuses for multi-channel acoustic echo cancelation | |||
| 122 | 9210505 | Maintaining spatial stability utilizing common gain coefficient | |||
| 123 | 9210504 | Processing audio signals | |||
| 124 | 9210502 | Echo cancelling device | |||
| 125 | 9210270 | Echo cancellation for ultrasound | |||
| 126 | 9203972 | Efficient audio signal processing in the sub-band regime | |||
| 127 | 9203527 | Sharing a designated audio signal | |||
| 128 | 9197974 | Directional audio capture adaptation based on alternative sensory input | |||
| 129 | 9191740 | Method and apparatus for in-ear canal sound suppression | |||
| 130 | 9191519 | Echo suppressor using past echo path characteristics for updating | |||
| 131 | 9191494 | Device, system, and method for performing echo cancellation in different modes of a communication device | |||
| 132 | 9185506 | Comfort noise generation based on noise estimation | |||
| 133 | 9185233 | Audio communication device and method using fixed echo cancellation filter coefficients | |||
| 134 | 9184791 | Selective adaptive audio cancellation algorithm configuration | |||
| 135 | 9179224 | Hearing device with adaptive feedback-path estimation | |||
| 136 | 9172817 | Communication system | |||
| 137 | 9172816 | Echo suppression | |||
| 138 | 9172791 | Noise estimation algorithm for non-stationary environments | |||
| 139 | 9171551 | Unified microphone pre-processing system and method | |||
| 140 | 9167342 | Echo suppression | |||
| 141 | 9160864 | Systems and methods for stereo echo cancellation | |||
| 142 | 9154873 | Echo suppression | |||
| 143 | 9154635 | Signal processing method, signal processing device, and signal processing program | |||
| 144 | 9148724 | Audio system signal processing control using microphone movement information | |||
| 145 | 9143862 | Correlation based filter adaptation | |||
| 146 | 9143621 | Computation saving echo canceller for a wide band audio signal | |||
| 147 | 9142223 | Sound processing to produce target volume level | |||
| 148 | 9136906 | Detection of double talk in telecommunications networks | |||
| 149 | 9136905 | Multi-receiving terminal echo cancellation method and system | |||
| 150 | 9131317 | Sharing public addressing system using personal communication devices in an ad-hoc network | |||
| 151 | 9131316 | Sharing public addressing system using personal communication devices in an ad-hoc network | |||
| 152 | 9131041 | Using an auxiliary device sensor to facilitate disambiguation of detected acoustic environment changes | |||
| 153 | 9130747 | Software radio frequency canceller | |||
| 154 | 9129594 | Signal processing apparatus and signal processing method | |||
| 155 | 9124708 | Far-end sound quality indication for telephone devices | |||
| 156 | 9118769 | Mobile phone and method for processing call signal thereof | |||
| 157 | 9112951 | Acoustic echo suppression | |||
| 158 | 9100736 | Control of an adaptive feedback cancellation system based on probe signal injection | |||
| 159 | 9100466 | Method for processing an audio signal and audio receiving circuit | |||
| 160 | 9097795 | Proximity detecting apparatus and method based on audio signals | |||
| 161 | 9094496 | System and method for stereophonic acoustic echo cancellation | |||
| 162 | 9088336 | Systems and methods of echo and noise cancellation in voice communication | |||
| 163 | 9083785 | Systems and methods selectively excluding tones from vectoring | |||
| 164 | 9083783 | Detecting double talk in acoustic echo cancellation using zero-crossing rate | |||
| 165 | 9083782 | Dual beamform audio echo reduction | |||
| 166 | 9083776 | Echo mitigation in a conference call | |||
| 167 | 9076426 | Training an echo canceller in severe noise | |||
| 168 | 9065896 | Method and system for sampling rate mismatch correction of transmitting and receiving terminals | |||
| 169 | 9065895 | Non-linear echo cancellation | |||
| 170 | 9060052 | Single channel, binaural and multi-channel dereverberation | |||
| 171 | 9042567 | Acoustic echo cancellation system | |||
| 172 | 9042535 | Echo control optimization | |||
| 173 | 9036816 | Frequency domain acoustic echo cancellation using filters and variable step-size updates | |||
| 174 | 9036815 | Method for acoustic echo cancellation and system thereof | |||
| 175 | 9036814 | Echo suppression | |||
| 176 | 9025764 | Detection and suppression of returned audio at near-end | |||
| 177 | 9025763 | Apparatus and method for cancelling wideband acoustic echo | |||
| 178 | 9025762 | System and method for clock synchronization of acoustic echo canceller (AEC) with different sampling clocks for speakers and microphones | |||
| 179 | 9020144 | Cross-domain processing for noise and echo suppression | |||
| 180 | 9008302 | Audio acoustic echo cancellation for video conferencing | |||
| 181 | 9001994 | Non-uniform adaptive echo cancellation | |||
| 182 | 9001974 | System for providing telephony and data services | |||
| 183 | 8983058 | Echo canceller and a method thereof | |||
| 184 | 8983057 | Step size control for acoustic echo cancellation | |||
| 185 | 8971523 | Over-sampled single-sided subband echo cancellation | |||
| 186 | 8971522 | Noise reduction | |||
| 187 | 8964967 | Subband domain echo masking for improved duplexity of spectral domain echo suppressors | |||
| 188 | 8958544 | Time-alignment of crosstalk acquisition phases between multiple joining lines | |||
| 189 | 8953777 | Echo path change detector with robustness to double talk | |||
| 190 | 8953776 | Particular signal cancel method, particular signal cancel device, adaptive filter coefficient update method, adaptive filter coefficient update device, and computer program | |||
| 191 | 8942370 | Filter bank optimization for acoustic echo cancellation | |||
| 192 | 8938066 | Methods, apparatus and articles of manufacture to cancel echo for communication paths having long bulk delays | |||
| 193 | 8934622 | Method for detecting double-talk condition and system using the same | |||
| 194 | 8934621 | Echo prevention circuit having signal subtracter feature | |||
| 195 | 8934620 | Acoustic echo cancellation for high noise and excessive double talk | |||
2014 | |||||
| 196 | 8923530 | Speakerphone feedback attenuation | |||
| 197 | 8923509 | Controlling echo in a wideband voice conference | |||
| 198 | 8923508 | Half-duplex speakerphone echo canceler | |||
| 199 | 8917864 | Full-duplex audio communication terminal | |||
| 200 | 8917863 | Method and device for data processing in a digital subscriber line environment | |||
| 201 | 8917639 | Eliminating false audio associated with VoIP communications | |||
| 202 | 8913737 | Echo canceller and microphone apparatus | |||
| 203 | 8897429 | Communication circuit employing optocoupler | |||
| 204 | 8892450 | Signal clipping protection using pre-existing audio gain metadata | |||
| 205 | 8885840 | Device, system and method for measurement of media consumption in digital media terminals | |||
| 206 | 8885815 | Null-forming techniques to improve acoustic echo cancellation | |||
| 207 | 8879721 | Audio communication system | |||
| 208 | 8879720 | Acoustic echo cancellation using a variable length adaptive filter | |||
| 209 | 8873742 | Echo canceller auditor | |||
| 210 | 8873741 | Methods, apparatuses and computer program products for providing active echo-cancellation for systems combining voice communication and synchronous audio content | |||
| 211 | 8873740 | Enhanced echo cancellation | |||
| 212 | 8867735 | Echo cancelling device, communication device, and echo cancelling method having the error signal generating circuit | |||
| 213 | 8861713 | Clipping based on cepstral distance for acoustic echo canceller | |||
| 214 | 8861712 | Method, apparatus, and system for reducing line-to-line crosstalk during transmission of digital subscriber line service | |||
| 215 | 8861711 | Echo cancellation apparatus, conferencing system using the same, and echo cancellation method | |||
| 216 | 8855295 | Acoustic echo cancellation using blind source separation | |||
| 217 | 8831210 | Method and system for detection of onset of near-end signal in an echo cancellation system | |||
| 218 | 8824667 | Time-domain acoustic echo control | |||
| 219 | 8824666 | Noise cancellation for phone conversation | |||
| 220 | 8811603 | Echo canceler circuit and method | |||
| 221 | 8811602 | Full duplex speakerphone design using acoustically compensated speaker distortion | |||
| 222 | 8811601 | Integrated echo cancellation and noise suppression | |||
| 223 | 8792649 | Echo canceller used for voice communication | |||
| 224 | 8787561 | Techniques for implementing adaptation control of an echo canceller to facilitate detection of in-band signals | |||
| 225 | 8787560 | Method for determining a set of filter coefficients for an acoustic echo compensator | |||
| 226 | 8774399 | System for reducing speakerphone echo | |||
| 227 | 8774398 | Transceiver | |||
| 228 | 8767951 | Talk deciding system | |||
| 229 | 8761386 | Sound processing apparatus, method, and program | |||
| 230 | 8761385 | Signal processing method, signal processing device, and signal processing program | |||
| 231 | 8761349 | Systems and methods of monitoring performance of acoustic echo cancellation | |||
| 232 | 8750494 | Clock skew compensation for acoustic echo cancellers using inaudible tones | |||
| 233 | 8750493 | Method and system for stereo echo cancellation for VoIP communication systems | |||
| 234 | 8750492 | Reducing the feedback overhead during crosstalk precoder initialization | |||
| 235 | 8750491 | Mitigation of echo in voice communication using echo detection and adaptive non-linear processor | |||
| 236 | 8744069 | Removing near-end frequencies from far-end sound | |||
| 237 | 8737601 | Echo canceller | |||
| 238 | 8731184 | Performance testing of echo cancellers using a white noise test signal | |||
| 239 | 8730852 | Eliminating false audio associated with VoIP communications | |||
| 240 | 8724799 | Operating points for spectrum management in digital subscriber lines | |||
| 241 | 8724798 | System and method for acoustic echo cancellation using spectral decomposition | |||
| 242 | 8718275 | Low complex and robust delay estimation | |||
| 243 | 8718273 | Apparatus for processing echo signal and method thereof | |||
| 244 | 8712068 | Acoustic echo cancellation | |||
| 245 | 8712034 | Adaptive analog echo/next cancellation | |||
| 246 | 8705758 | Audio processing device and method for reducing echo from a second signal in a first signal | |||
| 247 | 8694326 | Communication terminal and communication method | |||
| 248 | 8693698 | Method and apparatus to reduce non-linear distortion in mobile computing devices | |||
| 249 | 8693678 | Device and method for controlling damping of residual echo | |||
| 250 | 8693677 | Techniques for updating filter coefficients of an adaptive filter | |||
| 251 | 8687797 | Method and system for a dual echo canceller | |||
| 252 | 8670555 | Communication apparatus for rapidly adjusting analog echo cancellation circuit and related echo cancellation method | |||
| 253 | 8670554 | Method for encoding multiple microphone signals into a source-separable audio signal for network transmission and an apparatus for directed source separation | |||
| 254 | 8666058 | Time domain adaptive filter bank for network echo reduction or cancellation | |||
| 255 | 8654967 | System for conditioning echo response of loop start trunk line | |||
| 256 | 8644496 | Echo suppressor, echo suppressing method, and computer readable storage medium | |||
| 257 | 8644495 | Echo canceler | |||
| 258 | 8644494 | Echo canceler | |||
| 259 | 8634547 | Echo canceller operative in response to fluctuation on echo path | |||
| 260 | 8634546 | Signal processing device, echo canceller, and signal processing method | |||
| 261 | 8630405 | Echo removing apparatus | |||
| 262 | 8625776 | Detection and suppression of returned audio at near-end | |||
| 263 | 8625775 | Method and system for reducing echo and noise in a vehicle passenger compartment environment | |||
2013 | |||||
| 264 | 8619970 | Echo cancellers and echo cancelling methods | |||
| 265 | 8615075 | Method and apparatus for removing noise signal from input signal | |||
| 266 | 8606573 | Voice recognition improved accuracy in mobile environments | |||
| 267 | 8605891 | Adaptive gain control based on echo canceller performance information | |||
| 268 | 8605890 | Multichannel acoustic echo cancellation | |||
| 269 | 8600040 | Apparatus and method for convergence control | |||
| 270 | 8600039 | System for low complexity adaptive ECHO and NEXT cancellers | |||
| 271 | 8600038 | System and method for echo cancellation | |||
| 272 | 8600037 | Audio quality and double talk preservation in echo control for voice communications | |||
| 273 | 8594320 | Hybrid echo and noise suppression method and device in a multi-channel audio signal | |||
| 274 | 8588404 | Method and apparatus for acoustic echo cancellation in VoIP terminal | |||
| 275 | 8582781 | Echo modulation methods and systems | |||
| 276 | 8582754 | Method and system for echo cancellation in presence of streamed audio | |||
| 277 | 8582577 | Modem with voice processing capability | |||
| 278 | 8577019 | Methods, apparatus and articles of manufacture to detect echo during teleconferences | |||
| 279 | 8571204 | Apparatus and method for echo control in parameter domain | |||
| 280 | 8565416 | Cache-based echo canceller | |||
| 281 | 8565415 | Gain and spectral shape adjustment in audio signal processing | |||
| 282 | 8559656 | System and method for automatic microphone volume setting | |||
| 283 | 8542818 | Vehicle call device, call system, center, and calling method | |||
| 284 | 8538037 | Audio signal decorrelator, multi channel audio signal processor, audio signal processor, method for deriving an output audio signal from an input audio signal and computer program | |||
| 285 | 8538008 | Acoustic echo canceler using an accelerometer | |||
| 286 | 8520821 | Systems and methods for switching between computer and presenter audio transmission during conference call | |||
| 287 | 8515086 | Method and system for clock drift compensation | |||
| 288 | 8515055 | Adaptive filtering with flexible selection of algorithm complexity and performance | |||
| 289 | 8515054 | Voice and data exchange over a packet based network with echo cancellation | |||
| 290 | 8503669 | Integrated latency detection and echo cancellation | |||
| 291 | 8499020 | Method and system for estimating and applying a step size value for LMS echo cancellers | |||
| 292 | 8498423 | Device for and a method of processing audio signals | |||
| 293 | 8498407 | Systems and methods for double-talk detection in acoustically harsh environments | |||
| 294 | 8488776 | Echo suppressing method and apparatus | |||
| 295 | 8488745 | Endpoint echo detection | |||
| 296 | 8483398 | Methods and systems for reducing acoustic echoes in multichannel communication systems by reducing the dimensionality of the space of impulse responses | |||
| 297 | 8472617 | Interaction between echo canceller and packet voice processing | |||
| 298 | 8472616 | Self calibration of envelope-based acoustic echo cancellation | |||
| 299 | 8467544 | Filter coefficient setting device and echo prevention device | |||
| 300 | 8467521 | Echo canceler circuit and method | |||
| 301 | 8463331 | Deterministic characterization and reduction of acoustic echo | |||
| 302 | 8462936 | Adaptive delay compensation for acoustic echo cancellation | |||
| 303 | 8452002 | Methods, apparatus and articles of manufacture to cancel echo for communication paths having long bulk delays | |||
| 304 | 8441515 | Method and apparatus for minimizing acoustic echo in video conferencing | |||
| 305 | 8433074 | Echo suppressing method and apparatus | |||
| 306 | 8433061 | Reducing echo | |||
| 307 | 8433060 | Method and system for stereo echo cancellation for VoIP communication systems | |||
| 308 | 8433059 | Echo canceller canceling an echo according to timings of producing and detecting an identified frequency component signal | |||
| 309 | 8433058 | Method and system for distributed speakerphone echo cancellation | |||
| 310 | 8428247 | Echo mitigation in a conference call | |||
| 311 | 8422663 | Structure and method for echo reduction without loss of information | |||
| 312 | 8416946 | System and process for regression-based residual acoustic echo suppression | |||
| 313 | 8411847 | Acoustic echo canceller | |||
| 314 | 8411846 | Echo path change detection in telecommunications networks | |||
| 315 | 8406416 | Configuring virtual noise parameters of very high-speed digital subscriber line | |||
| 316 | 8406415 | Privacy modes in an open-air multi-port conferencing device | |||
| 317 | 8401178 | Multiple microphone switching and configuration | |||
| 318 | 8401177 | Combined sidetone and hybrid balance | |||
| 319 | 8401176 | Acoustic echo canceller with multimedia training signal | |||
| 320 | 8396206 | Multi-channel communication device and methods for reducing echoes by inserting a training sequence under a spectral mask | |||
| 321 | 8391504 | Method and system for artificial reverberation employing dispersive delays | |||
| 322 | 8391472 | Acoustic echo cancellation solution for video conferencing | |||
| 323 | 8391471 | Echo suppressing apparatus, echo suppressing system, echo suppressing method and recording medium | |||
| 324 | 8385539 | Method and arrangement for controlling adaptive filters | |||
| 325 | 8374851 | Voice activity detector and method | |||
| 326 | 8374355 | Robust and efficient frequency-domain decorrelation method | |||
| 327 | 8369512 | Device and method for detecting a divergence of an adaptive system and use of such a device for the detection of a divergence of a digital filter | |||
| 328 | 8369251 | Timestamp quality assessment for assuring acoustic echo canceller operability | |||
| 329 | 8364480 | Method and apparatus for controlling echo in the coded domain | |||
| 330 | 8363821 | Apparatus and method for canceling echo | |||
| 331 | 8355511 | System and method for envelope-based acoustic echo cancellation | |||
| 332 | 8351597 | Electronic device, echo canceling method thereof, non-transitory computer readable medium, circuit substrate, and portable telephone terminal device | |||
| 333 | 8345860 | Method and system for detection of onset of near-end signal in an echo cancellation system | |||
2012 | |||||
| 334 | 8340278 | Method and apparatus for cross-talk resistant adaptive noise canceller | |||
| 335 | 8335319 | Double talk detection method based on spectral acoustic properties | |||
| 336 | 8335311 | Communication apparatus capable of echo cancellation | |||
| 337 | 8331552 | Detection of double talk in telecommunications networks | |||
| 338 | 8325911 | Personal speakerphone device | |||
| 339 | 8325910 | Echo cancelling device, communication device, and echo cancelling method having the error signal generating circuit | |||
| 340 | 8325909 | Acoustic echo suppression | |||
| 341 | 8320577 | Method and apparatus for multi-channel audio processing using single-channel components | |||
| 342 | 8320554 | Acoustic echo canceller clock compensation | |||
| 343 | 8320553 | Enhanced echo cancellation | |||
| 344 | 8320552 | Delay estimator | |||
| 345 | 8315380 | Echo suppression method and apparatus thereof | |||
| 346 | 8315379 | Single transducer full duplex talking circuit | |||
| 347 | 8311234 | Echo canceller and communication audio processing apparatus | |||
| 348 | 8306215 | Echo canceller for eliminating echo without being affected by noise | |||
| 349 | 8306214 | Method and system for clear signal capture | |||
| 350 | 8300801 | System and method for telephone based noise cancellation | |||
| 351 | 8295476 | Echo canceller and echo cancellation method | |||
| 352 | 8295475 | Selective glitch detection, clock drift compensation, and anti-clipping in audio echo cancellation | |||
| 353 | 8295474 | Echo canceller with heavy double-talk estimation | |||
| 354 | 8290143 | Delay estimator | |||
| 355 | 8290142 | Echo cancellation in a portable conferencing device with externally-produced audio | |||
| 356 | 8290141 | Techniques for comfort noise generation in a communication system | |||
| 357 | 8290140 | Sound event processing with echo analysis | |||
| 358 | 8284949 | Multi-channel acoustic echo cancellation system and method | |||
| 359 | 8284007 | Magnetic package for a communication system | |||
| 360 | 8280037 | Echo canceller having its effective filter taps adaptively controlled with echo cancellation amount monitored | |||
| 361 | 8280036 | Configuring the virtual noise parameters of a digital subscriber line | |||
| 362 | 8275142 | Acoustic echo cancellation system | |||
| 363 | 8275139 | Linear full duplex system and method for acoustic echo cancellation | |||
| 364 | 8275120 | Adaptive acoustic echo cancellation | |||
| 365 | 8271051 | Method and system for double-end talk detection, and method and system for echo elimination | |||
| 366 | 8265263 | Delayed adaptation structure for improved double-talk immunity in echo cancellation devices | |||
| 367 | 8259928 | Method and apparatus for reducing timestamp noise in audio echo cancellation | |||
| 368 | 8259927 | Method and arrangement for the adaptive filtering of signals | |||
| 369 | 8259926 | System and method for 2-channel and 3-channel acoustic echo cancellation | |||
| 370 | 8259917 | System and method for generating one-way speech signal samples | |||
| 371 | 8254561 | Headset adapter with host phone detection and characterization | |||
| 372 | 8254560 | Oscillation-echo preventing circuit and microphone/speaker unit | |||
| 373 | 8238548 | Controlling echo during double-talk in a voice conference | |||
| 374 | 8238547 | Sound pickup apparatus and echo cancellation processing method | |||
| 375 | 8238546 | Echo canceler circuit and method | |||
| 376 | 8233632 | Method and apparatus for multi-channel audio processing using single-channel components | |||
| 377 | 8229107 | Echo canceler | |||
| 378 | 8223960 | Apparatus and method for removing an echo signal in a signal transmission/reception apparatus of a communication system | |||
| 379 | 8223959 | Echo cancellation in which sound source signals are spatially distributed to all speaker devices | |||
| 380 | 8223943 | Systems and methods for computer and voice conference audio transmission during conference call via PSTN phone | |||
| 381 | 8218757 | Echo canceler | |||
| 382 | 8213598 | Harmonic distortion residual echo suppression | |||
| 383 | 8213597 | Audio communication device and methods for reducing echoes by inserting a training sequence under a spectral mask | |||
| 384 | 8213596 | Method of accelerating the training of an acoustic echo canceller in a full-duplex beamforming-based audio conferencing system | |||
| 385 | 8208623 | Echo processing method and device | |||
| 386 | 8208622 | Performance testing of echo cancellers using a white noise test signal | |||
| 387 | 8208621 | Systems and methods for acoustic echo cancellation | |||
| 388 | 8208462 | Line driver for an adaptive hybrid circuit | |||
| 389 | 8204210 | Method and system for nonlinear acoustic echo cancellation in hands-free telecommunication devices | |||
| 390 | 8204209 | Full duplex hands-free telephone system | |||
| 391 | 8199927 | Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter | |||
| 392 | 8194852 | Low complexity echo compensation system | |||
| 393 | 8194851 | Voice processing apparatus, voice processing system, and voice processing program | |||
| 394 | 8194850 | Method and apparatus for voice communication | |||
| 395 | 8189767 | Method and system for clear signal capture | |||
| 396 | 8189766 | System and method for blind subband acoustic echo cancellation postfiltering | |||
| 397 | 8189765 | Multichannel echo canceller | |||
| 398 | 8184802 | Adaptive analog echo/next cancellation | |||
| 399 | 8184801 | Acoustic echo cancellation for time-varying microphone array beamsteering systems | |||
| 400 | 8184790 | Notification of dropped audio in a teleconference call | |||
| 401 | 8175871 | Apparatus and method of noise and echo reduction in multiple microphone audio systems | |||
| 402 | 8175261 | Systems and methods for adaptive echo cancellation | |||
| 403 | 8175260 | Echo cancellation | |||
| 404 | 8170226 | Acoustic echo cancellation and adaptive filters | |||
| 405 | 8170200 | Method and apparatus for percussive noise reduction in a conference | |||
| 406 | 8170199 | Echo canceller | |||
| 407 | 8160241 | Communication terminal device with echo canceller and its echo canceling method | |||
| 408 | 8160240 | Echo cancellation balance using noise generator and average power detection | |||
| 409 | 8160239 | Echo canceller and speech processing apparatus | |||
| 410 | 8155304 | Filter bank optimization for acoustic echo cancellation | |||
| 411 | 8155303 | System and method for cancelling echo | |||
| 412 | 8155302 | Acoustic echo canceller | |||
| 413 | 8150027 | Control of echo cancellation filters | |||
| 414 | 8144863 | Method and apparatus for echo cancellation | |||
| 415 | 8144862 | Method and apparatus for the detection and suppression of echo in packet based communication networks using frame energy estimation | |||
| 416 | 8139760 | Estimating delay of an echo path in a communication system | |||
| 417 | 8130941 | Echo canceler | |||
| 418 | 8130940 | Echo detection | |||
| 419 | 8126161 | Acoustic echo canceller system | |||
| 420 | 8121260 | Method and apparatus for retraining of echo cancellation | |||
| 421 | 8116448 | Acoustic echo canceler | |||
| 422 | 8107619 | Method, system and apparatus for controlling a network interface device | |||
| 423 | 8107617 | Audio processor | |||
| 424 | 8107616 | Acoustic echo canceller | |||
| 425 | 8103011 | Signal detection using multiple detectors | |||
| 426 | 8098813 | Communication system | |||
| 427 | 8094809 | Frame-based level feedback calibration system for sample-based predictive clipping | |||
| 428 | 8090094 | Echo canceller | |||
| 429 | 8090093 | Echo canceller | |||
2011 | |||||
| 430 | 8085930 | Communication system | |||
| 431 | 8081753 | Hybrid echo canceller controllers | |||
| 432 | 8077859 | Adaptive analog echo/NEXT cancellation | |||
| 433 | 8077858 | Echo canceler and echo canceling method | |||
| 434 | 8077857 | Portable speakerphone device with selective mixing | |||
| 435 | 8077642 | Methods and apparatus for signal echo cancellation and transmitter calibration in full duplex systems | |||
| 436 | 8073133 | Echo canceler and echo canceling method | |||
| 437 | 8073132 | Echo canceler and echo canceling program | |||
| 438 | 8073131 | Portable device case with corner protector | |||
| 439 | 8068884 | Acoustic echo reduction circuit for a "hands-free" device usable with a cell phone | |||
| 440 | 8054966 | Echo cancellation and noise reduction adaptation during ringing signal playback | |||
| 441 | 8045703 | Apparatus and method for echo-cancellation | |||
| 442 | 8045702 | Multi-path active hybrid circuit | |||
| 443 | 8041028 | Double-talk detection | |||
| 444 | 8041027 | Electricity echo cancellation device and method | |||
| 445 | 8036376 | Echo prevention circuit having adaptive digital filter | |||
| 446 | 8032365 | Method and apparatus for controlling echo in the coded domain | |||
| 447 | 8031863 | Apparatus and method for controlling acoustic echo cancellation in mobile communication terminal | |||
| 448 | 8023641 | Spectral domain, non-linear echo cancellation method in a hands-free device | |||
| 449 | 8019076 | Portable speakerphone device and subsystem utilizing false doubletalk detection | |||
| 450 | 8019075 | Hybrid echo canceller controllers | |||
| 451 | 8014519 | Cross-correlation based echo canceller controllers | |||
| 452 | 8014517 | Method and apparatus for enhanced convergence of the normalized LMS algorithm | |||
| 453 | 8014516 | Method and apparatus for echo cancellation | |||
| 454 | 7995745 | Structure and method for echo reduction without loss of information | |||
| 455 | 7991146 | Anti-howling structure | |||
| 456 | 7970124 | Adaptive gain control based on echo canceller performance information | |||
| 457 | 7970123 | Adaptive coupling equalization in beamforming-based communication systems | |||
| 458 | 7970122 | Circuit method and system for transmitting information | |||
| 459 | 7965834 | Method and system for clear signal capture | |||
| 460 | 7933295 | Cable modem with voice processing capability | |||
| 461 | 7925008 | Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus | |||
| 462 | 7925007 | Multi-input channel and multi-output channel echo cancellation | |||
| 463 | 7925006 | Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus | |||
| 464 | 7920697 | Interaction between echo canceller and packet voice processing | |||
| 465 | 7917562 | Method and system for estimating and applying a step size value for LMS echo cancellers | |||
| 466 | 7899195 | Adaptive howling canceller | |||
| 467 | 7894598 | System for limiting receive audio | |||
| 468 | 7881460 | Configuration of echo cancellation | |||
| 469 | 7881459 | Acoustic echo canceller using multi-band nonlinear processing | |||
| 470 | 7876892 | Multiple echo cancellation using a fixed filter delay | |||
| 471 | 7876718 | Echo reduction | |||
| 472 | 7869587 | Method and apparatus for canceling acoustic echo in a mobile terminal | |||
| 473 | 7864718 | Echo cancellation device for full duplex communication systems | |||
2010 | |||||
| 474 | 7860236 | Method and system for echo cancellation in a network switch | |||
| 475 | 7856098 | Echo cancellation and control in discrete cosine transform domain | |||
| 476 | 7856097 | Echo canceling apparatus, telephone set using the same, and echo canceling method | |||
| 477 | 7844365 | Field-mounted process device | |||
| 478 | 7835774 | Removal of local duplication voice on conference calls | |||
| 479 | 7831036 | Method to reduce training time of an acoustic echo canceller in a full-duplex beamforming-based audio conferencing system | |||
| 480 | 7831035 | Integration of a microphone array with acoustic echo cancellation and center clipping | |||
| 481 | 7826609 | Method and apparatus for digital near-end echo/near-end crosstalk cancellation with adaptive correlation | |||
| 482 | 7822194 | Method and system for low delay echo cancelling | |||
| 483 | 7822193 | Estimation method and apparatus | |||
| 484 | 7822192 | Sound event processing with echo analysis | |||
| 485 | 7821957 | Acknowledgment of media waveforms between telecommunications endpoints | |||
| 486 | 7817797 | Method and apparatus for detecting echo path changes in an acoustic echo canceller | |||
| 487 | 7813499 | System and process for regression-based residual acoustic echo suppression | |||
| 488 | 7813498 | Full-duplex communication device and method of acoustic echo cancellation therein | |||
| 489 | 7813497 | Echo canceller with interference-level controlled step size | |||
| 490 | 7813496 | Method for reducing a computational complexity in non-linear filter arrangements as well as corresponding filter arrangements | |||
| 491 | 7809129 | Acoustic echo cancellation based on noise environment | |||
| 492 | 7796767 | Howling detection method, device, and acoustic device using the same | |||
| 493 | 7792281 | Delay estimation and audio signal identification using perceptually matched spectral evolution | |||
| 494 | 7792280 | Narrow band tone detection in echo canceling system | |||
| 495 | 7787613 | Method and apparatus for double-talk detection in a hands-free communication system | |||
| 496 | 7783478 | Two stage frequency subband decomposition | |||
| 497 | 7783032 | Method and system for processing subband signals using adaptive filters | |||
| 498 | 7778408 | Method and apparatus for acoustic echo cancellation utilizing dual filters | |||
| 499 | 7773743 | Integration of a microphone array with acoustic echo cancellation and residual echo suppression | |||
| 500 | 7773742 | Echo canceller | |||
| 501 | 7773741 | Voice and data exchange over a packet based network with echo cancellation | |||
| 502 | 7769186 | System and method facilitating acoustic echo cancellation convergence detection | |||
| 503 | 7769162 | Acoustic echo canceller with multimedia training signal | |||
| 504 | 7764783 | Acoustic echo cancellation with oversampling | |||
| 505 | 7747002 | Method and system for stereo echo cancellation for VoIP communication systems | |||
| 506 | 7747001 | Speech signal processing with combined noise reduction and echo compensation | |||
| 507 | 7742592 | Method and device for removing echo in an audio signal | |||
| 508 | 7742387 | Cancellation of crosstalk energy in communication loops | |||
| 509 | 7742386 | Multiple channel interference cancellation | |||
| 510 | 7738655 | Interference canceller tap sharing in a communications transceiver | |||
| 511 | 7734036 | Dynamic attenuation method and apparatus for optimizing voice quality using echo cancellers | |||
| 512 | 7734035 | Method and apparatus for soft-response echo suppression | |||
| 513 | 7724893 | Method of adaptation step control in echo cancellers | |||
| 514 | 7724892 | Method and apparatus for optimizing speakerphone performance based on tilt angle | |||
| 515 | 7724891 | Method to reduce acoustic coupling in audio conferencing systems | |||
| 516 | 7720232 | Speakerphone | |||
| 517 | 7711108 | Fast echo canceller reconvergence after TDM slips and echo level changes | |||
| 518 | 7711107 | Perceptual masking of residual echo | |||
| 519 | 7706549 | Broadside small array microphone beamforming apparatus | |||
| 520 | 7693291 | Multi-channel frequency-domain adaptive filter method and apparatus | |||
| 521 | 7693276 | Method of measuring distortion and determining residue-echo threshold in loop start trunk circuits | |||
| 522 | 7688968 | Adaptive analog echo/next cancellation | |||
| 523 | 7684559 | Acoustic echo suppressor for hands-free speech communication | |||
| 524 | 7680266 | System and method for adaptive reduced-rank parameter estimation using an adaptive decimation and interpolation scheme | |||
| 525 | 7680265 | Echo canceler circuit and method | |||
| 526 | 7672447 | Frequency domain echo canceller | |||
| 527 | 7672446 | Echo processing method and device | |||
| 528 | 7672445 | Method and system for nonlinear echo suppression | |||
| 529 | 7649988 | Comfort noise generator using modified Doblinger noise estimate | |||
| 530 | 7643630 | Echo suppression with increment/decrement, quick, and time-delay counter updating | |||
2009 | |||||
| 531 | 7636436 | Method for the performance testing of echo cancellers using an artificial segmented test signal | |||
| 532 | 7636435 | Device and method for processing audio signals and telecommunication set equipped with such a processing device | |||
| 533 | 7627111 | Noise matching for echo cancellers | |||
| 534 | 7620172 | Method and system for eliminating noises and echo in voice signals | |||
| 535 | 7613291 | Echo path change detection using dual sparse filtering | |||
| 536 | 7599483 | Echo canceler circuit and method | |||
| 537 | 7599432 | Method and apparatus for dynamically inserting gain in an adaptive filter system | |||
| 538 | 7596220 | Echo cancellation using adaptive IIR and FIR filters | |||
| 539 | 7583768 | Apparatus for canceling intersymbol interference in semiconductor memory device and method thereof | |||
| 540 | 7577248 | Method and apparatus for echo cancellation, digit filter adaptation, automatic gain control and echo suppression utilizing block least mean squares | |||
| 541 | 7564964 | Echo canceller | |||
| 542 | 7558729 | Music detection for enhancing echo cancellation and speech coding | |||
| 543 | 7555117 | Path change detector for echo cancellation | |||
| 544 | 7555116 | Real time processing and management method for cancelling out the echo between a loudspeaker and a microphone of a computer terminal | |||
| 545 | 7554933 | Echo cancellation device for full duplex communication systems | |||
| 546 | 7552050 | Speech recognition system and method utilizing adaptive cancellation for talk-back voice | |||
| 547 | 7548616 | Termination device for a telephone line | |||
| 548 | 7545926 | Echo and noise cancellation | |||
| 549 | 7539300 | Echo canceller with enhanced infinite and finite ERL detection | |||
| 550 | 7539299 | Office-line trunk circuit operating on ground-start and loop-start modes, method of controlling same, and control program for same | |||
| 551 | 7536007 | Echo cancellation using adaptive IIR and FIR filters | |||
| 552 | 7536006 | Method and system for near-end detection | |||
| 553 | 7532717 | Echo canceler with automatic gain control of echo cancellation signal | |||
| 554 | 7525952 | Method and apparatus for determining the source of user-perceived voice quality degradation in a network telephony environment | |||
| 555 | 7515704 | Method, apparatus and articles incorporating a step size control technique for echo signal cancellation | |||
| 556 | 7512227 | Echo canceller controller | |||
| 557 | 7508931 | Method for detecting echo path changes in echo cancellers | |||
| 558 | 7502461 | Echo cancellation in a communication network | |||
| 559 | 7483530 | Apparatus for separating blind source signals having systolic array structure | |||
| 560 | 7477735 | System and method for enhanced stereo audio | |||
2008 | |||||
| 561 | 7471788 | Echo cancellers for sparse channels | |||
| 562 | 7457353 | Method and system for mitigating Fourier transform side lobes | |||
| 563 | 7454011 | ADSL communication system having echo canceller and method for downloading filter coefficient of the echo canceller | |||
| 564 | 7450714 | Echo canceller having improved non-linear processor | |||
| 565 | 7450713 | Echo canceller employing dual-H architecture having improved non-linear echo path detection | |||
| 566 | 7443978 | Method and apparatus for audio coding with noise suppression | |||
| 567 | 7436787 | Transceiver for full duplex communication systems | |||
| 568 | 7433463 | Echo cancellation and noise reduction method | |||
| 569 | 7428304 | Method and apparatus for detecting subscriber alerting signal tones and customer premises equipment alerting signal tones to non-echo canceling modems | |||
| 570 | 7426270 | Method and system for clear signal capture | |||
| 571 | 7409057 | Nonlinear echo compensator for class B transmitter line driver | |||
| 572 | 7408891 | Echo canceller employing H-register and storage register | |||
| 573 | 7403610 | Echo canceller employing dual-H architecture having split adaptive gain settings | |||
| 574 | 7403609 | Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus | |||
| 575 | 7403608 | Echo processing devices for single-channel or multichannel communication systems | |||
| 576 | 7386120 | Echo canceller having a frequency domain active region location estimator | |||
| 577 | 7359504 | Method and apparatus for reducing echo and noise | |||
| 578 | 7352858 | Multi-channel echo cancellation with round robin regularization | |||
| 579 | 7352687 | Mixed domain cancellation | |||
| 580 | 7333605 | Acoustic echo cancellation with adaptive step size and stability control | |||
| 581 | 7319748 | Device and method for suppressing echo in telephones | |||
2007 | |||||
| 582 | 7313233 | Tone clamping and replacement | |||
| 583 | 7310425 | Multi-channel frequency-domain adaptive filter method and apparatus | |||
| 584 | 7295670 | Howling suppression device and howling suppression method | |||
| 585 | 7280654 | Modified affine projection algorithm for non-stationary signal | |||
| 586 | 7277538 | Distortion compensation in an acoustic echo canceler | |||
| 587 | 7269211 | Residual echo reduction for a full duplex transceiver | |||
| 588 | 7266092 | Adaptive frequency duplexing system and method | |||
| 589 | 7260214 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections | |||
| 590 | 7260213 | Telephone echo canceller | |||
| 591 | 7251322 | Systems and methods for echo cancellation with arbitrary playback sampling rates | |||
| 592 | 7242762 | Monitoring and control of an adaptive filter in a communication system | |||
| 593 | 7236586 | Synchronization of echo cancellers in a voice processing system | |||
| 594 | 7236463 | Transceiver for echo and near-end crosstalk cancellation without loop timing configuration | |||
| 595 | 7221755 | Method of capturing constant echo path information in a full duplex speakerphone | |||
| 596 | 7218730 | System and method for analysis and filtering of signals in a telecommunications network | |||
| 597 | 7215765 | Method and apparatus for pure delay estimation in a communication system | |||
| 598 | 7212628 | Echo cancellation/suppression and double-talk detection in communication paths | |||
| 599 | 7209566 | Method and apparatus for determining a nonlinear response function for a loudspeaker | |||
| 600 | 7206561 | Radio equipment | |||
| 601 | 7206404 | Communications system and method utilizing centralized signal processing | |||
| 602 | 7197146 | Microphone array signal enhancement | |||
| 603 | 7194084 | System and method for stereo conferencing over low-bandwidth links | |||
| 604 | 7190800 | Howling control device and howling control method | |||
| 605 | 7181000 | Voice transmission device and voice transmission system | |||
| 606 | 7180869 | Comprehensive echo control system | |||
| 607 | 7177419 | Methods and apparatuses for detecting and reducing non-linear echo in a multi-carrier communication system | |||
| 608 | 7177416 | Channel control and post filter for acoustic echo cancellation | |||
| 609 | 7173962 | High-speed modem with uplink remote-echo canceller | |||
| 610 | 7171003 | Robust and reliable acoustic echo and noise cancellation system for cabin communication | |||
| 611 | 7170927 | Methods and apparatus for an ADSL transceiver | |||
| 612 | 7167568 | Microphone array signal enhancement | |||
2006 | |||||
| 613 | 7155018 | System and method facilitating acoustic echo cancellation convergence detection | |||
| 614 | 7154867 | Echo reduction | |||
| 615 | 7151828 | Circuit arrangement for the analogue suppression of echoes | |||
| 616 | 7146003 | Noise level calculator for echo canceller | |||
| 617 | 7142533 | Echo canceller and compression operators cascaded in time division multiplex voice communication path of integrated access device for decreasing latency and processor overhead | |||
| 618 | 7136670 | Mobile communication device with audio recorder | |||
| 619 | 7136471 | Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path | |||
| 620 | 7133442 | Rapid identification of transmission media channel characteristics | |||
| 621 | 7106856 | Method and apparatus for performing echo cancellation within a communication network | |||
| 622 | 7099458 | Downlink activity and double talk probability detector and method for an echo canceler circuit | |||
| 623 | 7095848 | Power up reset circuit for line powered circuit | |||
| 624 | 7095847 | DC/DC converter and subscriber line interface circuit | |||
| 625 | 7092516 | Echo processor generating pseudo background noise with high naturalness | |||
| 626 | 7092513 | Limiting maximum gain in duplex communications devices including telephone sets | |||
| 627 | 7085374 | Distributed echo cancelling | |||
| 628 | 7085245 | Coefficient domain history storage of voice processing systems | |||
| 629 | 7072466 | Method and apparatus for canceling echo in a telephone communication system | |||
| 630 | 7068780 | Hybrid echo canceller | |||
| 631 | 7068711 | Multi-function equalizer arrangement | |||
| 632 | 7065206 | Method and apparatus for adaptive echo and noise control | |||
| 633 | 7054438 | Method and apparatus for active reduction of speakerphone singing | |||
| 634 | 7054437 | Statistical adaptive-filter controller | |||
| 635 | 7050577 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections | |||
| 636 | 7050576 | Double talk, NLP and comfort noise | |||
| 637 | 7050575 | Echo canceler coefficient update apparatus and method | |||
| 638 | 7050545 | Methods and apparatus for echo cancellation using an adaptive lattice based non-linear processor | |||
| 639 | 7046795 | Method and apparatus for active latency characterization | |||
| 640 | 7043014 | Apparatus and method for time-alignment of two signals | |||
| 641 | 7043013 | Method for adaptive control of multichannel acoustic echo cancellation system and device therefor | |||
| 642 | 7039181 | Consolidated voice activity detection and noise estimation | |||
| 643 | 7035415 | Method and device for acoustic echo cancellation combined with adaptive beamforming | |||
| 644 | 7035398 | Echo cancellation processing system | |||
| 645 | 7035397 | System and method for updating filter coefficients and echo canceller including same | |||
| 646 | 7035396 | Configurable echo canceller | |||
| 647 | 7031461 | Robust adaptive filter for echo cancellation | |||
| 648 | 7031458 | Method and apparatus for isolation in a data access arrangement using analog encoded pulse signaling | |||
| 649 | 7027591 | Integrated noise cancellation and residual echo suppression | |||
| 650 | 7023812 | System and method for improving modem transmission through private branch exchanges, central offices, and other systems | |||
| 651 | 7020279 | Method and system for filtering a signal and for providing echo cancellation | |||
| 652 | 7020276 | Frequency sensitive inductance device in POTS splitter design | |||
| 653 | 7020246 | Time domain reflected signal measurement using statistical signal processing | |||
| 654 | 7016490 | Circuit board capacitor structure for forming a high voltage isolation barrier | |||
| 655 | 7016489 | System and method for performing echo cancellation for non-linearities | |||
| 656 | 7016488 | Method and apparatus for non-linear processing of an audio signal | |||
| 657 | 7016487 | Digital echo cancellation device | |||
| 658 | 7009945 | Dual-mode analog/digital adaptive echo cancellation in communication systems with asymmetric spectrum | |||
| 659 | 7003103 | Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit | |||
| 660 | 7003101 | Subband echo location and double-talk detection in communication systems | |||
| 661 | 7003100 | Modem with enhanced echo canceler | |||
| 662 | 7003097 | Synchronization of echo cancellers in a voice processing system | |||
| 663 | 7003096 | Full duplex telephone set using echo cancellation and side tone management for high gain stability | |||
| 664 | 7003095 | Acoustic echo canceler and handsfree telephone set | |||
| 665 | 7003094 | Adaptive interference cancellation for ADSL | |||
| 666 | 7002897 | Multiple channel interference cancellation | |||
| 667 | 6999582 | Echo cancelling/suppression for handsets | |||
| 668 | 6996231 | Step size convergence control | |||
| 669 | 6983047 | Echo canceling system for a bit pump and method of operating the same | |||
2005 | |||||
| 670 | 6968352 | Device for digital processing with frequency filtering and reduced computation complexity | |||
| 671 | 6968064 | Adaptive thresholds in acoustic echo canceller for use during double talk | |||
| 672 | 6963642 | Band-by-band full duplex communication | |||
| 673 | 6961422 | Gain control method for acoustic echo cancellation and suppression | |||
| 674 | 6959084 | Network interface unit shelf assembly with multi-positionable customer interface module | |||
| 675 | 6954530 | Echo cancellation filter | |||
| 676 | 6952474 | Phone privacy and unobtrusiveness via voice cancellation | |||
| 677 | 6952473 | System and method for echo assessment in a communication network | |||
| 678 | 6950513 | Impulse response setting method for the 2-channel echo canceling filter, a two-channel echo canceller, and a two-way 2-channel voice transmission device | |||
| 679 | 6947550 | Acoustic echo cancellation | |||
| 680 | 6947549 | Echo canceller | |||
| 681 | 6937722 | Method and apparatus for echo cancellation | |||
| 682 | 6934387 | Method and apparatus for digital near-end echo/near-end crosstalk cancellation with adaptive correlation | |||
| 683 | 6934386 | Echo canceller | |||
| 684 | 6932187 | Protective acoustic cover assembly | |||
| 685 | 6931123 | Echo cancellation | |||
| 686 | 6931121 | Dual personality analog port | |||
| 687 | 6931120 | Telephone-computer interface | |||
| 688 | 6928160 | Estimating bulk delay in a telephone system | |||
| 689 | 6925178 | Returning ringing signals through the tip amplifier of subscriber-line interface circuitry | |||
| 690 | 6925177 | Echo canceler compensating for amplifier saturation and echo amplification | |||
| 691 | 6925176 | Method for enhancing the acoustic echo cancellation system using residual echo filter | |||
| 692 | 6922403 | Acoustic echo control system and double talk control method thereof | |||
| 693 | 6917688 | Adaptive noise cancelling microphone system | |||
| 694 | 6917682 | Method and device for echo cancelling | |||
| 695 | 6912281 | Route delay sensitive echo cancellation | |||
| 696 | 6909041 | Sound field control method and sound field control system | |||
| 697 | 6904146 | Full duplex echo cancelling circuit | |||
| 698 | 6898281 | System and method for filtering echo/NEXT signal interferrence | |||
| 699 | 6895094 | Adaptive identification method and device, and adaptive echo canceller implementing such method | |||
| 700 | 6891948 | Echo canceller | |||
| 701 | 6889066 | Network echo suppression in mobile stations | |||
| 702 | 6879670 | Collective housing intercom apparatus | |||
| 703 | 6873704 | Apparatus for removing echo from speech signals with variable rate | |||
| 704 | 6868158 | Echo processing apparatus | |||
| 705 | 6859531 | Residual echo estimation for echo cancellation | |||
| 706 | 6856685 | Feed arrangement for a subscriber loop with multi-level current regulation capability | |||
| 707 | 6850783 | Methods and apparatus for mitigating the effects of microphone overload in echo cancelation systems | |||
| 708 | 6847930 | Analog voice activity detector for telephone | |||
| 709 | 6842516 | Digital adaptive filter and acoustic echo canceller using the same | |||
| 710 | 6839426 | Echo cancellor | |||
2004 | |||||
| 711 | 6836547 | Protecting an echo canceller against random transitions in echo paths | |||
| 712 | 6834108 | Method for improving acoustic noise attenuation in hand-free devices | |||
| 713 | 6829353 | Mechanism for preventing clipping of pulse metering signals in telephone line card channels | |||
| 714 | 6826279 | Base band echo cancellation using laguerre echo estimation | |||
| 715 | 6816591 | Voice switching system and voice switching method | |||
| 716 | 6813351 | Method and apparatus for echo cancellation that suppresses echo leak through | |||
| 717 | 6804350 | Method and apparatus for improving echo cancellation in non-voip systems | |||
| 718 | 6804203 | Double talk detector for echo cancellation in a speech communication system | |||
| 719 | 6798881 | Noise reduction circuit for telephones | |||
| 720 | 6798754 | Acoustic echo cancellation equipped with howling suppressor and double-talk detector | |||
| 721 | 6795551 | Circuit for removing in-band FSK signals without muting of receiver | |||
| 722 | 6795547 | Full duplex speaker-phone providing increased loop stability | |||
| 723 | 6785384 | Two-step algorithm for training an echo cancellation filter | |||
| 724 | 6785382 | System and method for controlling a filter to enhance speakerphone performance | |||
| 725 | 6778671 | Method of reference to echo time alignment for facilitation of echo cancellation | |||
| 726 | 6771771 | Method and device for echo cancellation | |||
| 727 | 6771769 | Method and apparatus for active reduction of speakerphone singing | |||
| 728 | 6771701 | Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis | |||
| 729 | 6768723 | Method of operating a full duplex speakerphone echo canceller | |||
| 730 | 6766019 | Method and apparatus for performing double-talk detection in acoustic echo cancellation | |||
| 731 | 6765971 | System method and computer program product for improved narrow band signal detection for echo cancellation | |||
| 732 | 6760436 | Echo canceling apparatus determining dynamically changing echo component | |||
| 733 | 6757385 | Symmetry based subband acoustic echo cancellation | |||
| 734 | 6757384 | Robust double-talk detection and recovery in a system for echo cancelation | |||
| 735 | 6754337 | Telephone having four VAD circuits | |||
| 736 | 6751315 | High bandwidth phone line transceiver with capacitor isolation | |||
| 737 | 6751313 | Method and apparatus for an improved echo canceller | |||
| 738 | 6748086 | Cabin communication system without acoustic echo cancellation | |||
| 739 | 6747581 | Techniques for variable sample rate conversion | |||
| 740 | 6744887 | Acoustic echo processing system | |||
| 741 | 6744884 | Speaker-phone system change and double-talk detection | |||
| 742 | 6738480 | Method and device for cancelling stereophonic echo with frequency domain filtering | |||
| 743 | 6731750 | xDSL multiple-point interface device | |||
| 744 | 6721411 | Audio conference platform with dynamic speech detection threshold | |||
| 745 | 6718041 | Echo attenuating method and device | |||
| 746 | 6718036 | Linear predictive coding based acoustic echo cancellation | |||
| 747 | 6718035 | Echo canceller employing dual-H architecture having split adaptive gain settings | |||
| 748 | 6711259 | Method and apparatus for noise suppression and side-tone generation | |||
| 749 | 6707912 | Method and apparatus for setting a step size for an adaptive filter coefficient of an echo canceller | |||
| 750 | 6707910 | Detection of the speech activity of a source | |||
| 751 | 6704415 | Echo canceler | |||
| 752 | 6700979 | Echo canceller | |||
| 753 | 6700977 | Method and apparatus for cancelling multi-channel echo | |||
| 754 | 6700976 | Noise canceler system with adaptive cross-talk filters | |||
| 755 | 6694020 | Frequency domain stereophonic acoustic echo canceller utilizing non-linear transformations | |||
| 756 | 6694018 | Echo canceling apparatus and method, and voice reproducing apparatus | |||
| 757 | 6683961 | Process and apparatus for eliminating loudspeaker interference from microphone signals | |||
| 758 | 6674865 | Automatic volume control for communication system | |||
2003 | |||||
| 759 | 6665401 | Method for canceling echo | |||
| 760 | 6662027 | Method of arbitrating speakerphone operation in a portable communication device for eliminating false arbitration due to echo | |||
| 761 | 6661895 | Zero-delay structure for sub-band echo cancellation | |||
| 762 | 6658107 | Methods and apparatus for providing echo suppression using frequency domain nonlinear processing | |||
| 763 | 6636604 | Method and device for suppressing echo in a hands free device such as a telephone | |||
| 764 | 6628781 | Methods and apparatus for improved sub-band adaptive filtering in echo cancellation systems | |||
| 765 | 6628779 | Method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors | |||
| 766 | 6622030 | Echo suppression using adaptive gain based on residual echo energy | |||
| 767 | 6618481 | Method for improving acoustic sidetone suppression in hands-free telephones | |||
| 768 | 6611601 | Echo sound signal suppressing apparatus | |||
| 769 | 6608898 | Band pass and notch filters for echo reduction with less phase distortion | |||
| 770 | 6608897 | Double-talk insensitive NLMS algorithm | |||
| 771 | 6606382 | System and method for implementation of an echo canceller | |||
| 772 | 6597787 | Echo cancellation device for cancelling echos in a transceiver unit | |||
| 773 | 6590975 | Echo canceller | |||
| 774 | 6590974 | Howling controller | |||
| 775 | 6580795 | Echo canceller for a full-duplex communication system and method therefor | |||
| 776 | 6580794 | Acoustic echo canceler with a peak impulse response detector | |||
| 777 | 6577731 | Method and apparatus of cancelling multi-channel echoes | |||
| 778 | 6574337 | Adaptive echo canceler undoing adaptations made during double-talk | |||
| 779 | 6574336 | Echo suppressor and non-linear processor of echo canceller | |||
| 780 | 6570986 | Double-talk detector | |||
| 781 | 6570985 | Echo canceler adaptive filter optimization | |||
| 782 | 6563925 | Method and apparatus for space-time echo cancellation | |||
| 783 | 6563803 | Acoustic echo canceller | |||
| 784 | 6560332 | Methods and apparatus for improving echo suppression in bi-directional communications systems | |||
| 785 | 6556682 | Method for cancelling multi-channel acoustic echo and multi-channel acoustic echo canceller | |||
| 786 | 6556564 | Scheduled internet protocol telephone instrument system | |||
| 787 | 6553122 | Method and apparatus for multi-channel acoustic echo cancellation and recording medium with the method recorded thereon | |||
| 788 | 6549627 | Generating calibration signals for an adaptive beamformer | |||
| 789 | 6546099 | Arrangement for suppressing an interfering component of an input signal | |||
| 790 | 6545985 | Echo cancellation mechanism | |||
| 791 | 6539091 | Apparatus for sidetone damping | |||
| 792 | 6535604 | Voice-switching device and method for multiple receivers | |||
| 793 | 6516063 | Echo canceller having improved non-linear processor | |||
| 794 | 6510225 | Ultrasonically-calibrated fast-start echo canceller for cellular and pcs telephone car kits | |||
| 795 | 6510224 | Enhancement of near-end voice signals in an echo suppression system | |||
| 796 | 6507653 | Desired voice detection in echo suppression | |||
| 797 | 6507652 | Echo canceller employing dual-H architecture having improved non-linear echo path detection | |||
2002 | |||||
| 798 | 6496581 | Coupled acoustic echo cancellation system | |||
| 799 | 6487178 | Methods and apparatus for providing volume control in communicating systems including a linear echo canceler | |||
| 800 | 6459942 | Acoustic coupling compensation for a speakerphone of a system | |||
| 801 | 6453041 | Voice activity detection system and method | |||
| 802 | 6449361 | Control method and device for echo canceller | |||
| 803 | 6442275 | Echo canceler including subband echo suppressor | |||
| 804 | 6434235 | Acoustic echo canceler | |||
| 805 | 6434234 | Process for improving the echo suppression in a telecommunications system | |||
| 806 | 6434110 | Full-duplex speakerphone circuit including a double-talk detector | |||
| 807 | 6430295 | Methods and apparatus for measuring signal level and delay at multiple sensors | |||
| 808 | 6424720 | Method and device for reducing multi-channel acoustic echo and adapting sound to space conditions | |||
| 809 | 6408070 | Method and apparatus for echo control in a communication system | |||
| 810 | 6404886 | Method and apparatus for echo cancelling with multiple microphones | |||
| 811 | 6389440 | Acoustic feedback correction | |||
| 812 | 6385176 | Communication system based on echo canceler tap profile | |||
| 813 | 6381224 | Method and apparatus for controlling a full-duplex communication system | |||
| 814 | 6377682 | Robust adaptive filter for use in acoustic and network echo cancellation | |||
| 815 | 6370245 | Full duplex communication circuits with bilateral T hybrid and balanced impedance configurations | |||
| 816 | 6360203 | System and method for dynamic voice-discriminating noise filtering in aircraft | |||
| 817 | 6354748 | Playing audio files at high priority | |||
| 818 | 6351532 | Echo canceler employing multiple step gains | |||
| 819 | 6339641 | Telephone device | |||
2001 | |||||
| 820 | 6311071 | Low-feedback compact wireless telephone | |||
| 821 | 6304654 | Telephone handset interface with feedback control | |||
| 822 | 6301491 | Device and method for radio terminal with hands-free function | |||
| 823 | 6301364 | Tagging echoes with low frequency noise | |||
| 824 | 6301357 | AC-center clipper for noise and echo suppression in a communications system | |||
| 825 | 6295364 | Simplified communication system | |||
| 826 | 6282176 | Full-duplex speakerphone circuit including a supplementary echo suppressor | |||
| 827 | 6278785 | Echo cancelling process with improved phase control | |||
| 828 | 6269161 | System and method for near-end talker detection by spectrum analysis | |||
| 829 | 6266408 | Echo controlling apparatus of video conferencing system and control method using the same | |||
| 830 | 6263078 | Acoustic echo canceller with fast volume control compensation | |||
| 831 | 6256384 | Method and apparatus for cancelling echo originating from a mobile terminal | |||
| 832 | 6249581 | Spectrum-based adaptive canceller of acoustic echoes arising in hands-free audio | |||
| 833 | 6246760 | Subband echo cancellation method for multichannel audio teleconference and echo canceller using the same | |||
| 834 | 6240180 | Echo canceller employing dual-H architecture having split adaptive gain settings | |||
| 835 | 6236725 | Echo canceler employing multiple step gains | |||
| 836 | 6233462 | Portable terminal device for automatically controlling transmitting voice level and calling sound level | |||
| 837 | 6226380 | Method of distinguishing between echo path change and double talk conditions in an echo canceller | |||
| 838 | 6215880 | Two-wire conference apparatus with echo canceler without training | |||
| 839 | 6212275 | Telephone with automatic pause responsive, noise reduction muting and method | |||
| 840 | 6212273 | Full-duplex speakerphone circuit including a control interface | |||
| 841 | 6201866 | Echo canceler employing segment-based reinitialization | |||
| 842 | 6199036 | Tone detection using pitch period | |||
| 843 | 6198819 | Echo canceller having improved non-linear processor | |||
| 844 | 6195437 | Method and apparatus for independent gain control of a microphone and speaker for a speakerphone mode and a non-speakerphone audio mode of a computer system | |||
| 845 | 6192126 | Double talk detector, method for double talk detection and device incorporating such a detector | |||
| 846 | 6185300 | Echo canceler for use in communications system | |||
| 847 | 6185299 | Adaptive echo cancellation device in a voice communication system | |||
| 848 | 6185298 | Telephone having a speech ban limiting function | |||
| 849 | 6181753 | Echo/noise canceler with delay compensation | |||
| 850 | 6178162 | Method and apparatus for inhibiting echo in a channel of a communication system | |||
| 851 | 6175634 | Adaptive noise reduction technique for multi-point communication system | |||
| 852 | 6173058 | Sound processing unit | |||
2000 | |||||
| 853 | 6163608 | Methods and apparatus for providing comfort noise in communications systems | |||
| 854 | 6160886 | Methods and apparatus for improved echo suppression in communications systems | |||
| 855 | 6154639 | Handsfree unit | |||
| 856 | 6151614 | Adaptive filter and adapting method thereof | |||
| 857 | 6148078 | Methods and apparatus for controlling echo suppression in communications systems | |||
| 858 | 6147979 | System and method for echo cancellation in a communication system | |||
| 859 | 6141415 | Method and apparatus for detecting speech at a near-end of a communications system, a speaker-phone system, or the like | |||
| 860 | 6138040 | Method for suppressing speaker activation in a portable communication device operated in a speakerphone mode | |||
| 861 | 6137881 | Adaptive filtering method and apparatus employing modified fast affine projection algorithm | |||
| 862 | 6108413 | Echo cancellation method and echo canceller implementing such a process | |||
| 863 | 6097971 | Hands-free speech communication apparatus | |||
| 864 | 6091965 | Low-feedback compact wireless telephone | |||
| 865 | 6091937 | Method and apparatus for the automatic adjustment of a switch means for automatic switching between a reception operating mode and a transmission operating mode in a hands-free means of a communication terminal equipment | |||
| 866 | 6091813 | Acoustic echo canceller | |||
| 867 | 6081732 | Acoustic echo elimination in a digital mobile communications system | |||
| 868 | 6069878 | TDM digital matrix intercom system | |||
| 869 | 6064873 | Method and apparatus for controlling echo on both sides of a connection | |||
| 870 | 6049606 | Circuit and method of double talk detection for use in handsfree telephony terminals | |||
| 871 | 6044150 | Method and apparatus for a host-based personal computer speakerphone | |||
| 872 | 6041290 | Method of adaptively adjusting the coefficients of a digital filter in an echo canceller | |||
| 873 | 6035034 | Double talk and echo path change detection in a telephony system | |||
| 874 | 6028929 | Echo canceller employing dual-H architecture having improved non-linear echo path detection | |||
1999 | |||||
| 875 | 6009165 | Full duplex speakerphone system | |||
| 876 | 6002950 | Satellite communication apparatus | |||
| 877 | 6002776 | Directional acoustic signal processor and method therefor | |||
| 878 | 5999828 | Multi-user wireless telephone having dual echo cancellers | |||
| 879 | 5987143 | Method and apparatus for erasing acoustic echo | |||
| 880 | 5982880 | Method and apparatus for canceling tone signal noise generated when using a speakerphone in a digital key telephone apparatus | |||
| 881 | 5982755 | System and method for providing high terminal coupling loss in a handsfree terminal | |||
| 882 | 5970137 | Loudspeaker gain correction for a hands-free telephone terminal | |||
| 883 | 5966438 | Method and apparatus for adaptive volume control for a radiotelephone | |||
| 884 | 5963639 | Telephone having an audio response function | |||
| 885 | 5949891 | Filtering audio signals from a combined microphone/speaker earpiece | |||
| 886 | 5943420 | Power-up system for line-powered telephones | |||
| 887 | 5940499 | Voice switch used in hands-free communications system | |||
| 888 | 5940486 | Two-way communication system with selective muting | |||
| 889 | 5937060 | Residual echo suppression | |||
| 890 | 5937009 | Sub-band echo canceller using optimum wavelet packets and cross-band cancellation | |||
| 891 | 5933493 | Telecommunications system, a subscriber unit, and a television set comprising a subscriber unit | |||
| 892 | 5923749 | Method and system for eliminating acoustic echos in a digital telecommunication system | |||
| 893 | 5913062 | Conference system having an audio manager using local and remote audio stream state machines for providing audio control functions during a conference session | |||
| 894 | 5912923 | System for transmitting coded speech signals | |||
| 895 | 5911124 | Method and apparatus for applying echo mitigation in a communication device | |||
| 896 | 5909489 | Method of and circuit arrangement for improving the transmission properties of an echo affected transmission link in a telecommunications network | |||
| 897 | 5909384 | System for dynamically adapting the length of a filter | |||
| 898 | 5907538 | Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input | |||
| 899 | 5901230 | Hands-free communication method for a multichannel transmission system | |||
| 900 | 5896450 | Automatically variable circuit of sound level of received voice signal in telephone | |||
| 901 | 5894513 | Hands-free communication unit having residual acoustic echo suppression means for suppressing residual echoes which have been left unremoved by an echo canceller, a bilateral communication system and a method for suppressing residual echoes | |||
| 902 | 5889857 | Acoustical echo canceller with sub-band filtering | |||
| 903 | 5887059 | System and method for performing echo cancellation in a communications network employing a mixed mode LMS adaptive balance filter | |||
| 904 | 5884194 | Hands-free telephone | |||
| 905 | 5875246 | Distributed audio signal processing in a network experiencing transmission delay | |||
| 906 | 5867574 | Voice activity detection system and method | |||
| 907 | 5867573 | Telephone handset interface with feedback control | |||
| 908 | 5862388 | Interrupt-time processing of received signals | |||
| 909 | 5859979 | System for negotiating conferencing capabilities by selecting a subset of a non-unique set of conferencing capabilities to specify a unique set of conferencing capabilities | |||
| 910 | 5859914 | Acoustic echo canceler | |||
| 911 | 5857019 | Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation | |||
1998 | |||||
| 912 | 5852769 | Cellular telephone audio input compensation system and method | |||
| 913 | 5848151 | Acoustical echo canceller having an adaptive filter with passage into the frequency domain | |||
| 914 | 5848146 | Audio system for conferencing/presentation room | |||
| 915 | 5841856 | Hands-free telephone set | |||
| 916 | 5838787 | Method and system for controlling echo return loss using a complementary variolosses in transmit path | |||
| 917 | 5838786 | Intelligent acoustic systems peripheral | |||
| 918 | 5835851 | Method and apparatus for echo reduction in a hands-free cellular radio using added noise frames | |||
| 919 | 5828756 | Stereophonic acoustic echo cancellation using non-linear transformations | |||
| 920 | 5825754 | Filter and process for reducing noise in audio signals | |||
| 921 | 5819183 | Low-feedback compact wireless telephone | |||
| 922 | 5818945 | Subband echo cancellation method using projection algorithm | |||
| 923 | 5818928 | Method and circuit arrangement for detecting speech in a telephone terminal from a remote speaker | |||
| 924 | 5809237 | Registration of computer-based conferencing system | |||
| 925 | 5805696 | Echo canceller adaptation technique | |||
| 926 | 5799078 | Echo canceller | |||
| 927 | 5796819 | Echo canceller for non-linear circuits | |||
| 928 | 5796818 | Dynamic optimization of handsfree microphone gain | |||
| 929 | 5794018 | System and method for synchronizing data streams | |||
| 930 | 5793863 | Telephone having a speech band limiting function | |||
| 931 | 5790657 | Echo suppressor capable of suppressing an echo resulting from acoustic coupling without spoiling a natural sound of conversation | |||
| 932 | 5790632 | Method and apparatus for echo canceling accounting for companding induced quantization error | |||
| 933 | 5787165 | Handsfree radiotelephone having dynamic path attenuation control for echo suppression | |||
| 934 | 5774674 | System for negotiating at least two sets of video capabilities between two nodes to perform video conferencing between the nodes according to the selected set | |||
| 935 | 5774562 | Method and apparatus for dereverberation | |||
| 936 | 5774561 | Subband acoustic echo canceller | |||
| 937 | 5771440 | Communication device with dynamic echo suppression and background noise estimation | |||
| 938 | 5768364 | Software speakerphone system and method of operating a speakerphone | |||
| 939 | 5761318 | Method and apparatus for multi-channel acoustic echo cancellation | |||
| 940 | 5757905 | Telephone set with circuit for suppression of howling and echo | |||
| 941 | 5737409 | Echo removing apparatus | |||
| 942 | 5737408 | Echo cancelling system suitable for voice conference | |||
| 943 | 5737407 | Voice activity detector for half-duplex audio communication system | |||
| 944 | 5734987 | Noise-controlled communication apparatus | |||
| 945 | 5734715 | Process and device for adaptive identification and adaptive echo canceller relating thereto | |||
| 946 | 5732134 | Doubletalk detection by means of spectral content | |||
| 947 | 5721772 | Subband acoustic echo canceller | |||
| 948 | 5721771 | Hands-free speaking device with echo canceler | |||
| 949 | 5721730 | Spectral noise compensation for telecommunication signal processing | |||
| 950 | 5715310 | Apparatus and method for echo attenuation | |||
| 951 | 5715309 | Conversion of compressed speech codes between attenuated and unattenuated formats | |||
| 952 | 5708722 | Microphone expansion for background noise reduction | |||
| 953 | 5706344 | Acoustic echo cancellation in an integrated audio and telecommunication system | |||
1997 | |||||
| 954 | 5699423 | Telephone set in which an echo signal is effectively cancelled in spite of being provided with a plurality of sound producing units | |||
| 955 | 5696821 | Radiotelephone and method therefor for substantially reducing audio feedback | |||
| 956 | 5696819 | Speech communication apparatus | |||
| 957 | 5692042 | Speakerphone controlled by a comparator with hysteresis | |||
| 958 | 5687229 | Method for controlling echo canceling in an echo canceller | |||
| 959 | 5687177 | Tone blocking using variable delay buffer | |||
| 960 | 5680450 | Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones | |||
| 961 | 5675641 | Dual-mode speaker telephone | |||
| 962 | 5673393 | Managing bandwidth over a computer network having a management computer that allocates bandwidth to client computers upon request | |||
| 963 | 5668871 | Audio signal processor and method therefor for substantially reducing audio feedback in a cummunication unit | |||
| 964 | 5666429 | Energy estimator and method therefor | |||
| 965 | 5666428 | Audio distribution system | |||
| 966 | 5664011 | Echo canceller with adaptive and non-adaptive filters | |||
| 967 | 5663955 | Echo canceller system with shared coefficient memory | |||
| 968 | 5663951 | Delayed transmission of data packets over networks | |||
| 969 | 5661813 | Method and apparatus for multi-channel acoustic echo cancellation | |||
| 970 | 5661795 | Adaptive signal processing device, echo suppressing device and hand-portable telephone device | |||
| 971 | 5657384 | Full duplex speakerphone | |||
| 972 | 5649008 | Circuit and method of reducing sidetone in a receive signal path | |||
| 973 | 5646991 | Noise replacement system and method in an echo canceller | |||
| 974 | 5646990 | Efficient speakerphone anti-howling system | |||
| 975 | 5644635 | Method of and device for echo cancellation | |||
| 976 | 5640450 | Speech circuit controlling sidetone signal by background noise level | |||
| 977 | 5638439 | Adaptive filter and echo canceller | |||
| 978 | 5638311 | Filter coefficient estimation apparatus | |||
| 979 | 5636323 | Speech communication apparatus having an echo canceler | |||
| 980 | 5636272 | Apparatus amd method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones | |||
| 981 | 5633936 | Method and apparatus for detecting a near-end speech signal | |||
| 982 | 5631967 | Processing audio signals using a state variable | |||
| 983 | 5631899 | Acoustic echo canceler | |||
| 984 | 5625697 | Microphone selection process for use in a multiple microphone voice actuated switching system | |||
| 985 | 5621800 | Integrated circuit that performs multiple communication tasks | |||
| 986 | 5621724 | Echo cancelling device capable of coping with deterioration of acoustic echo condition in a short time | |||
| 987 | 5619566 | Voice activity detector for an echo suppressor and an echo suppressor | |||
| 988 | 5617472 | Noise suppression of acoustic signal in telephone set | |||
| 989 | 5615256 | Device and method for automatically controlling sound volume in a communication apparatus | |||
| 990 | 5612996 | Loop gain processing system for speakerphone applications | |||
| 991 | 5610909 | Multistage echo canceler including time variation compensation | |||
| 992 | 5608804 | Method of and apparatus for identifying a system with adaptive filter | |||
| 993 | 5608793 | Speech control apparatus used in a folding telephone | |||
| 994 | 5604799 | Switching type echo canceler | |||
| 995 | 5604793 | Tone blocking using variable delay buffer | |||
| 996 | 5602913 | Robust double-talk detection | |||
| 997 | 5600797 | System for identifying new client and allocating bandwidth thereto by monitoring transmission of message received periodically from client computers informing of their current status | |||
| 998 | 5600714 | Conference telephone using dynamic modeled line hybrid | |||
| 999 | 5598468 | Method and apparatus for echo removal in a communication system | |||
| 1000 | 5598466 | Voice activity detector for half-duplex audio communication system | |||
| 1001 | 5592547 | Processing audio signals using a discrete state machine | |||
1996 | |||||
| 1002 | 5590128 | Dial lists for computer-based conferencing systems | |||
| 1003 | 5586180 | Method of automatic speech direction reversal and circuit configuration for implementing the method | |||
| 1004 | 5579389 | Histogram-based processing of audio signals | |||
| 1005 | 5577116 | Apparatus and method for echo characterization of a communication channel | |||
| 1006 | 5574934 | Preemptive priority-based transmission of signals using virtual channels | |||
| 1007 | 5570423 | Method of providing adaptive echo cancellation | |||
| 1008 | 5566238 | Distributed processing of audio signals | |||
| 1009 | 5561737 | Voice actuated switching system | |||
| 1010 | 5561668 | Echo canceler with subband attenuation and noise injection control | |||
| 1011 | 5559881 | Network echo canceller | |||
| 1012 | 5559880 | Circuit for hands free talking | |||
| 1013 | 5553137 | Method and apparatus for echo canceling in a communication system | |||
| 1014 | 5553014 | Adaptive finite impulse response filtering method and apparatus | |||
| 1015 | 5550901 | Full-duplex adapter for PBX telephone system | |||
| 1016 | 5548642 | Optimization of adaptive filter tap settings for subband acoustic echo cancelers in teleconferencing | |||
| 1017 | 5546458 | Handsfree communication apparatus | |||
| 1018 | 5544242 | Speakerphone with event driven control circuit | |||
| 1019 | 5539731 | Echo cancelling method and apparatus using fast projection scheme | |||
| 1020 | 5535433 | Hands-free circuitry providing audio signal adjustment based on speaker volume value | |||
| 1021 | 5528666 | Personal phone expansion system | |||
| 1022 | 5526426 | System and method for an efficiently constrained frequency-domain adaptive filter | |||
| 1023 | 5524110 | Conferencing over multiple transports | |||
| 1024 | 5513265 | Multi-channel echo cancelling method and a device thereof | |||
| 1025 | 5506954 | PC-based conferencing system | |||
| 1026 | 5506832 | Remote confidence testing for computer-based conferencing system | |||
| 1027 | 5502717 | Method and apparatus for estimating echo cancellation time | |||
| 1028 | 5493568 | Media dependent module interface for computer-based conferencing system | |||
| 1029 | 5483528 | TDM digital matrix intercom system | |||
1995 | |||||
| 1030 | 5479502 | Speaking apparatus having handfree conversation function | |||
| 1031 | 5477534 | Acoustic echo canceller | |||
| 1032 | 5475731 | Echo-canceling system and method using echo estimate to modify error signal | |||
| 1033 | 5473686 | Echo cancellation apparatus | |||
| 1034 | 5471528 | Voice switched speakerphone with filters having exponential transfer function in the monitoring path | |||
| 1035 | 5467394 | Method of improving sidetone attenuation in electroacoustic systems | |||
| 1036 | 5463618 | Echo canceller | |||
| 1037 | 5459786 | Loudspeaker telephone device comprising a novel noise suppressing circuit | |||
| 1038 | 5440644 | Audio distribution system having programmable zoning features | |||
| 1039 | 5434912 | Audio processing system for point-to-point and multipoint teleconferencing | |||
| 1040 | 5430796 | Auxiliary attenuator arrangement for use in voice-switched speakerphone and method of selectively inserting communication loss in speakerphone paths | |||
| 1041 | 5428604 | Training method for an echo canceller for use in a voice conference system | |||
| 1042 | 5428562 | Fast converging adaptive filter | |||
| 1043 | 5416829 | Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes | |||
| 1044 | 5414763 | Apparatus and method for providing echo suppression to a plurality of telephones | |||
| 1045 | 5410595 | Apparatus and method for noise reduction for a full-duplex speakerphone or the like | |||
| 1046 | 5408530 | Echo cancelling method and echo canceller using the same | |||
| 1047 | 5404397 | Conference system with automatic speaker detection and speaker unit | |||
| 1048 | 5400399 | Speech communication apparatus equipped with echo canceller | |||
| 1049 | 5398281 | Telephone with hands-free operation | |||
| 1050 | 5396554 | Multi-channel echo canceling method and apparatus | |||
| 1051 | 5396550 | Radio and land-line telephones with hands-free operation | |||
| 1052 | 5390250 | Echo canceller with improved doubletalk detection | |||
| 1053 | 5390244 | Method and apparatus for periodic signal detection | |||
| 1054 | 5387877 | Voltage controlled attenuator for speakerphones | |||
| 1055 | 5386465 | Audio processing system for teleconferencing with high and low transmission delays | |||
| 1056 | 5384843 | Hands-free telephone set | |||
| 1057 | 5381475 | Arrangement for suppressing echoes in a digital portable telephone | |||
| 1058 | 5379450 | Radio loudspeaker telephone device capable of automatically preventing howling on execution of calling operation | |||
1994 | |||||
| 1059 | 5371789 | Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors | |||
| 1060 | 5365583 | Method for fail-safe operation in a speaker phone system | |||
| 1061 | 5363434 | Audio distribution system | |||
| 1062 | 5359656 | Adaptive echo cancellation apparatus | |||
| 1063 | 5359653 | Circuit arrangement for controlling the volume range of a voice terminal | |||
| 1064 | 5353348 | Double echo cancelling system | |||
| 1065 | 5343521 | Device for processing echo, particularly acoustic echo in a telephone line | |||
| 1066 | 5329587 | Low-delay subband adaptive filter | |||
| 1067 | 5327496 | Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation | |||
| 1068 | 5323459 | Multi-channel echo canceler | |||
| 1069 | 5323458 | Echo cancellation in a full-duplex speakerphone | |||
| 1070 | 5321746 | Adjustable gain range current mirror | |||
| 1071 | 5319704 | Control circuit for voltage controlled attenuator for speakerphones | |||
| 1072 | 5307405 | Network echo canceller | |||
| 1073 | 5305307 | Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths | |||
| 1074 | 5297198 | Two-way voice communication methods and apparatus | |||
| 1075 | 5289539 | Echo canceller using impulse response estimating method | |||
1993 | |||||
| 1076 | 5272695 | Subband echo canceller with adjustable coefficients using a series of step sizes | |||
| 1077 | 5271057 | Audio processing system for teleconferencing system | |||
| 1078 | 5263083 | Method and apparatus for sharing speakerphone processor among multiple users | |||
| 1079 | 5263079 | Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes | |||
| 1080 | 5255316 | Hands-free telephone apparatus | |||
| 1081 | 5251263 | Adaptive noise cancellation and speech enhancement system and apparatus therefor | |||
| 1082 | 5247512 | Echo canceller | |||
| 1083 | 5237562 | Echo path transition detection | |||
| 1084 | 5212722 | Hands-free telephone having a handset volume attenuator for controlling speaker volume in a hands-free adaptor | |||
| 1085 | 5202918 | Duplex transducer for simultaneous voice broadcast and reception | |||
| 1086 | 5199065 | Method for automatic speech direction reversal, and circuit configuration for performing the method | |||
| 1087 | 5199064 | Fully-integrated telephone unit | |||
| 1088 | 5187741 | Enhanced acoustic calibration procedure for a voice switched speakerphone | |||
1992 | |||||
| 1089 | 5172410 | Conference telephone system and method | |||
| 1090 | 5172408 | Speakerphone state-controlled alerting arrangement | |||
| 1091 | 5170430 | Voice-switched handset receive amplifier | |||
| 1092 | 5138656 | Intercom with transducer enclosure to attenuate resonant frequencies | |||
| 1093 | 5136577 | Sub-band acoustic echo canceller | |||
| 1094 | 5134658 | Apparatus for discriminating information signals from noise signals in a communication signal | |||
| 1095 | 5131048 | Audio distribution system | |||
| 1096 | 5131032 | Echo canceller and communication apparatus employing the same | |||
| 1097 | 5125026 | Internal telephone intercom system | |||
| 1098 | 5121426 | Loudspeaking telephone station including directional microphone | |||
| 1099 | 5099472 | Hands free telecommunication apparatus and method | |||
1991 | |||||
| 1100 | 5075687 | Echo suppression with both digital and analog variable attenuators | |||
| 1101 | 5058153 | Noise mitigation and mode switching in communications terminals such as telephones | |||
| 1102 | 5054061 | Hands-free telephone | |||
| 1103 | 5050160 | Training method for an echo canceller for use in a voice conference system | |||
| 1104 | 5048082 | Voice direction recognition in a digital telephone station | |||
| 1105 | 5040206 | Communication apparatus having driving mechanism and speaker-phone | |||
| 1106 | 5033081 | Key telephone system | |||
| 1107 | 5027393 | Voice conference system using echo cancellers | |||
| 1108 | 5021783 | Method for operating an apparatus for facilitating communications | |||
| 1109 | 5020098 | Telephone conferencing arrangement | |||
| 1110 | 5016271 | Echo canceler-suppressor speakerphone | |||
| 1111 | 5014294 | Speakerphone for cellular telephones with howl prevention, detection, elimination and determination | |||
| 1112 | 5010570 | Method for active feedback suppression | |||
| 1113 | 5007046 | Computer controlled adaptive speakerphone | |||
| 1114 | 4998241 | Echo canceller | |||
| 1115 | 4991167 | Voice controlled attenuation adjustment in telephone transmission circuits | |||
| 1116 | 4991166 | Echo reduction circuit | |||
| 1117 | 4989242 | Control device for a hand-free alternate operating telephone set | |||
| 1118 | 4984265 | Device for forming the hands-free function in a telephone set, associating the gain switching and echo suppression functions | |||
| 1119 | 4982427 | Integrated circuit for telephone set with signal envelope detector | |||
| 1120 | 4982425 | Hands-free telephone | |||
1990 | |||||
| 1121 | 4979163 | Echo suppression arrangement for an adaptive speakerphone | |||
| 1122 | 4965833 | Voice enhancer system | |||
| 1123 | 4965822 | Full duplex speakerphone | |||
| 1124 | 4959857 | Acoustic calibration arrangement for a voice switched speakerphone | |||
| 1125 | 4956838 | Echo cancelling device with frequency sub-band filtering | |||
| 1126 | 4955055 | Loudspeaking telephone with a frequency shifting circuit | |||
| 1127 | 4945570 | Method for terminating a telephone call by voice command | |||
| 1128 | 4944002 | Current switch for use in telephony systems or the like | |||
| 1129 | 4930156 | Telephone receiver transmitter device | |||
| 1130 | 4912758 | Full-duplex digital speakerphone | |||
| 1131 | 4908855 | Electronic telephone terminal having noise suppression function | |||
| 1132 | 4903247 | Digital echo canceller | |||
| 1133 | 4901346 | Computer controlled speakerphone for adapting to a communication line | |||
| 1134 | 4899380 | Loudspeaking telephone with a variable gain circuit | |||
| 1135 | 4891837 | Voice control circuit for a communication terminal | |||
1989 | |||||
| 1136 | 4887288 | Self calibration arrangement for a voice switched speakerphone | |||
| 1137 | 4885773 | Apparatus for mounting a unidirectional microphone in a hands-free telephone subset | |||
| 1138 | 4879745 | Half-duplex speakerphone | |||
| 1139 | 4847897 | Adaptive expander for telephones | |||
| 1140 | 4843621 | Speakerphone using digitally compressed audio to detect acoustic feedback | |||
| 1141 | 4835484 | Gain control circuit for suppressing Larsen effect in a loudspeaker telephone | |||
| 1142 | 4831651 | Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier | |||
| 1143 | 4829565 | Telephone with background volume control | |||
| 1144 | 4819263 | Apparatus and method for hands free telephonic communication | |||
| 1145 | 4811390 | Control circuit for mobile telephone with full duplex operation capability | |||
| 1146 | 4796287 | Digital loudspeaking telephone | |||
1988 | |||||
| 1147 | 4764954 | Automatic gain control in a loudspeaker telephone set | |||
| 1148 | 4756021 | Telephone set | |||
| 1149 | 4754419 | Adaptive digital filter | |||
| 1150 | 4748663 | Loudspeaking telephone instrument | |||
| 1151 | 4741018 | Speakerphone using digitally compressed audio to control voice path gain | |||
| 1152 | 4736413 | Method for the control of voice channel attenuation | |||
| 1153 | 4731832 | Process and apparatus for control of a hands-free telephone set operating in alternation between sending and receiving | |||
| 1154 | 4731831 | Telephone instrument | |||
| 1155 | 4726062 | Duplex hands-free communications circuit | |||
| 1156 | 4724540 | Speakerphone with fast idle mode | |||
| 1157 | 4723277 | Loudspeaking telephone set having an anti-Larsen device for instability detection and control | |||
| 1158 | 4720856 | Control circuit having a direct current control loop for controlling the gain of an attenuator | |||
1987 | |||||
| 1159 | 4715063 | Speakerphone for radio and landline telephones | |||
| 1160 | 4715062 | Speakerphone control circuit having low gain states and method for controlling gain of speakerphone | |||
| 1161 | 4710953 | Speech control in a telephone station | |||
| 1162 | 4700382 | Voice-switched telephone circuit with center idle state | |||
| 1163 | 4696032 | Voice switched gain system | |||
| 1164 | 4691348 | Two way telephone communication system | |||
| 1165 | 4689814 | External device interface for an electronic telephone | |||
| 1166 | 4689506 | Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature | |||
| 1167 | 4679228 | Speakerphone sensing circuit | |||
| 1168 | 4677661 | Microprocessor controlled telephone unit | |||
| 1169 | 4669108 | Wireless hands-free conference telephone system | |||
| 1170 | 4658425 | Microphone actuation control system suitable for teleconference systems | |||
| 1171 | 4648110 | Circuit arrangement for a voice-controlled hands-free telephone facility | |||
| 1172 | 4644579 | Shunt regulator for hands-free telephone | |||
| 1173 | 4636586 | Speakerphone with adaptive cancellation of room echoes | |||
1986 | |||||
| 1174 | 4629829 | Full duplex speakerphone for radio and landline telephones | |||
| 1175 | 4608462 | Telephone instrument circuit | |||
| 1176 | 4600815 | Automatic gain control for echo cancellers and similar adaptive systems | |||
| 1177 | 4588859 | Two channel audio communication system | |||
| 1178 | 4580013 | Handsfree communication apparatus and method | |||
| 1179 | 4571461 | Conference telephone apparatus | |||
| 1180 | 4564939 | Handsfree telephone | |||
1985 | |||||
| 1181 | 4560840 | Digital handsfree telephone | |||
| 1182 | 4555596 | Loudspeaking telephones | |||
| 1183 | 4555592 | Wireless hands-free conference telephone system | |||
| 1184 | 4542263 | Speech control circuit | |||
| 1185 | 4527014 | Loudspeaking telephone | |||
| 1186 | 4513177 | Loudspeaking telephone system | |||
| 1187 | 4507524 | Loudspeaker telephone system | |||
| 1188 | 4506381 | Aural transmitter device | |||
| 1189 | 4497980 | Handsfree circuit for telephone instrument | |||
| 1190 | 4496799 | Handsfree telephone instrument using digital dial | |||
| 1191 | 4493950 | Loudspeaker telephone | |||
| 1192 | 4493101 | Anti-howl back device | |||
| 1193 | 4492824 | Speakerphone linear comparator | |||
1984 | |||||
| 1194 | 4490582 | Speakerphone control circuit | |||
| 1195 | 4488007 | Speech-amplifier telephone station | |||
| 1196 | 4485272 | Acoustic feedback cancelling electro-acoustic transducer network | |||
| 1197 | 4484034 | Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker | |||
| 1198 | 4465902 | Digital space phone system | |||
| 1199 | 4456792 | Voice switching arrangement for telephone conferencing | |||
| 1200 | 4454384 | Hands free telephone with switchable gain in the two speech signal paths | |||
| 1201 | 4453039 | Arrangement for avoiding annoying sustained oscillations in a closed-loop system and loud-speaking telephone set employing this arrangement | |||
| 1202 | 4433435 | Arrangement for reducing the noise in a speech signal mixed with noise | |||
1983 | |||||
| 1203 | 4414432 | Pseudo-full duplex television/telephone loudspeaker system | |||
| 1204 | 4400584 | Speakerphone for radio and, landline telephones | |||
| 1205 | 4400581 | Incoming audio detection circuit for a speaker telephone | |||
| 1206 | 4396802 | Aswixs remote speaker and handset set | |||
| 1207 | 4396799 | Combination of a loudspeaking telephone set and a hand set for soft speaking | |||
| 1208 | 4385207 | Line powered transformerless loudspeaking telephone | |||
| 1209 | 4378603 | Radiotelephone with hands-free operation | |||
1982 | |||||
| 1210 | 4359606 | Voice switching control system | |||
| 1211 | 4346261 | Speaker phones | |||
| 1212 | 4330690 | Telephone group listening systems | |||
| 1213 | 4329543 | Communication system | |||
| 1214 | 4319086 | Voice switch for hands free communication apparatus | |||
| 1215 | 4317959 | Speech control circuit | |||
| 1216 | 4315103 | Speech-controlled loudspeaker telephone station circuit | |||
| 1217 | 4309573 | Loudspeaking substation circuit | |||
1981 | |||||
| 1218 | 4304969 | Power circuit for loudspeaker telephone | |||
| 1219 | 4293740 | Hands free answer intercom | |||
| 1220 | 4282409 | Speech networks for telephone sets | |||
| 1221 | 4253000 | Method and system for reducing conference bridge oscillations | |||
| 1222 | 4251689 | Loudspeaker telephone apparatus | |||
| 1223 | 4243837 | Telephone transmission installation between interlocutors in a noisy environment | |||
1980 | |||||
| 1224 | 4225754 | Loudspeaker telephone | |||
| 1225 | 4215252 | Video teleconference audio echo control unit | |||
1979 | |||||
| 1226 | 4175216 | Intercom calling apparatus in a key telephone system | |||
| 1227 | 4162374 | Voice-switched telephone set | |||
| 1228 | 4161624 | Hands-free telephone with cascaded attenuators | |||
| 1229 | 4156797 | Filter for voice operated triggering circuits | |||
| 1230 | 4154981 | Telephone system for diver communication | |||
| 1231 | 4147892 | Speakerphone with dynamic level discriminator | |||
1978 | |||||
| 1232 | 4126770 | Echo canceller | |||
| 1233 | 4123620 | Apparatus for controlling the sound generation in the loudspeakers of intercommunicating telephone sets in response to speech signals from the microphones of said telephone sets | |||
| 1234 | 4119797 | Voice operated switch having an activation level which is higher than its sustaining level | |||
| 1235 | 4115658 | Two way telephone amplifier | |||
| 1236 | 4101735 | Two-way loudspeaking device for telephone stations | |||
1977 | |||||
| 1237 | 4065646 | Power converter | |||
| 1238 | 4057688 | Intercom embodying tap transducers | |||
| 1239 | 4052562 | System for control of speech direction in duplex telephone circuits | |||
| 1240 | 4051325 | Speech intercommunication system | |||
| 1241 | 4049911 | Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude | |||
| 1242 | 4025728 | Speaker telephone | |||
| 1243 | 4008376 | Loudspeaking teleconferencing circuit | |||
| 1244 | 4006310 | Noise-discriminating voice-switched two-way intercom system | |||
| 1245 | 4002854 | Loudspeaking telephone instruments | |||
1976 | |||||
| 1246 | 3976847 | Key telephone system intercom arrangement | |||
| 1247 | 3975588 | Acoustic feedback control | |||
| 1248 | 3974344 | Electronic speech circuit for a central battery telephone set | |||
| 1249 | 3970786 | Loudspeaking telephone with improved receive sensitivity | |||
| 1250 | 3963876 | Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network | |||
| 1251 | 3963868 | Loudspeaking telephone hysteresis and ambient noise control | |||
| 1252 | 3953676 | Digital control of a loudspeaking telephone system | |||
| 1253 | 3952166 | Loudspeaking telephone circuit | |||
| 1254 | 3946170 | Self regulating telephone sets | |||
| 1255 | 3944743 | Method and apparatus for feedback suppression | |||
| 1256 | 3939311 | Muting circuit for subscribers telephone | |||
| 1257 | 3932711 | Transmission of voice or sound through telegraphy | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||