СПИСОК патентов США - подгруппа МПК16 H04M9/08


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2017

19609141Loudspeaker localization with a microphone array
29602923Estimating a room impulse response
39602922Adaptive echo cancellation
49596541Post-filter for handling resonance-induced echo components
59591123Echo cancellation
69589556Energy adjustment of acoustic echo replica signal for speech enhancement
79584642Apparatus with adaptive acoustic echo control for speakerphone mode
89578161Method for metadata-based collaborative voice processing for voice communication
99564147Audio communication system, audio communication method, audio communication purpose program, audio transmission terminal, and audio transmission terminal purpose program
109562970Proximity detecting apparatus and method based on audio signals
119558758User feedback on microphone placement
129552827Echo control through hidden audio signals
139549079Acoustic echo cancellation for microphone array with dynamically changing beam forming
149544702Dynamic characterization of a communication device
159544442Lingering cancellation for data encoded audio signals
169544422Acoustic echo suppression
179542957Procedure and mechanism for controlling and using voice communication
189538299Acoustic echo cancellation (AEC) with conferencing environment templates (CETs)
199538283Ear microphone

2016

209531433Echo cancellation methodology and assembly for electroacoustic communication apparatuses
219530428Echo cancellation device
229521264Echo removal
239521249Echo path change detector with robustness to double talk
249520139Post tone suppression for speech enhancement
259516159System and method of double talk detection with acoustic echo and noise control
269509854Echo cancellation
279509852Audio acoustic echo cancellation for video conferencing
289508359Acoustic echo preprocessing for speech enhancement
299503815Perceptual echo gate approach and design for improved echo control to support higher audio and conversational quality
309503812Systems and methods for split echo cancellation
319497330Signal processing method, signal processing device, and signal processing program
329491545Methods and devices for reverberation suppression
339491306Signal processing control in an audio device
349484011Echo modulation methods and system
359479650Methods and devices for updating filter coefficients during echo cancellation
369473646Robust acoustic echo cancellation
379473645Audio quality in teleconferencing
389467571Echo removal
399462116Reducing the feedback overhead during crosstalk precoder initialization
409461702Systems and methods of echo and noise cancellation in voice communication
419451078Universal reconfigurable echo cancellation system
429449615Externally estimated SNR based modifiers for internal MMSE calculators
439449593Detecting nonlinear amplitude processing
449445196Inter-channel coherence reduction for stereophonic and multichannel acoustic echo cancellation
459443530Acoustic echo cancellation
469443528Method and device for eliminating echoes
479438308Echo cancellation with quantization compensation
489437210Audio signal processing
499437179Reverberation suppression device
509432219Voice energy collision back-off
519426300Matching reverberation in teleconferencing environments
529426279Systems and methods for echo cancellation and echo suppression
539420390Estimation and suppression of harmonic loudspeaker nonlinearities
549420115Method using array microphone to cancel echo
559420114Echo canceller for VOIP networks
569414162Systems and methods for echo reduction
579414158Single-channel, binaural and multi-channel dereverberation
589413478Method and systems for reducing crosstalk
599413434Cancellation of interfering audio on a mobile device
609407320Detection of double talk in telecommunications networks
619401996Synchronizing audio signal sampling in a wireless, digital audio conferencing system
629401995Method and arrangement for echo cancellation in conference systems
639392379Output phase modulation entrainment containment for digital filters
649386162Systems and methods for reducing audio noise
659385674Dynamic speaker management for multichannel audio systems
669380150Methods and devices for automatic volume control of a far-end voice signal provided to a captioning communication service
679379770Methods and systems for activating and deactivating communication paths
689374453Audio processing for multi-participant communication systems
699369557Frequency-dependent sidetone calibration
709363600Method and apparatus for improved residual echo suppression and flexible tradeoffs in near-end distortion and echo reduction
719363386Acoustic echo cancellation based on ultrasound motion detection
729361874Varying adaptive filter step size in acoustic echo cancellation
739357080Spatial quiescence protection for multi-channel acoustic echo cancellation
749352701Managing telephony and entertainment audio in a vehicle audio platform
759349363Audio signal processing system and echo signal removing method thereof
769344579Variable step size echo cancellation with accounting for instantaneous interference
779344050Dynamic speaker management with echo cancellation
789338304Bidirectional communication system and method for compensating for undesired feedback in the bidirectional communication system
799338278Determining the distance and/or acoustic quality between a mobile device and a base unit
809336792Systems and methods for voice enhancement in audio conference
819330682Apparatus and method for discriminating speech, and computer readable medium
829330650Sound masking device and sound masking method
839325855Echo elimination device and method for miniature hands-free voice communication system
849325854Structure and method for echo reduction without loss of information
859319791Reduced-delay subband signal processing system and method
869319783Attenuation of output audio based on residual echo
879319532Acoustic echo cancellation for audio system with bring your own devices (BYOD)
889319510Personalized bandwidth extension
899318123Apparatus and method for reproducing sound, and method for canceling a feedback signal
909312913Echo cancellation apparatus, echo cancellation method and communications apparatus
919307334Method for calculating audio latency in real-time audio processing system
929307318Audio processor circuits for acoustic echo cancellation and method therefor
939301048Signal processing method, signal processing device, and signal processing program
949293148Reducing noise in a shared media session
959288578Method and apparatus for canceling acoustic echo, and method for updating adaptive filter coefficient by the apparatus
969288576Dereverberation parameter estimation device and method, dereverberation/echo-cancellation parameter estimation device, dereverberation device, dereverberation/echo-cancellation device, and dereverberation device online conferencing system
979286881Echo canceler and echo detector
989282196Moving a sound localization point of a computer program during a voice exchange
999282195Echo canceller and echo cancellation method
1009280983Acoustic echo cancellation (AEC) for a close-coupled speaker and microphone system
1019277059Echo removal
1029275625Content based noise suppression
1039270830Echo canceller for VOIP networks
1049264807Multichannel acoustic echo reduction
1059264805Method for determining a set of filter coefficients for an acoustic echo compensator
1069264553Methods and apparatuses for echo cancelation with beamforming microphone arrays
1079258410Methods and systems for determining crosstalk for a joining line in a vectored system
1089246545Adaptive estimation of delay in audio systems
1099237241Voice packet dynamic echo cancellation system
1109237226Controlling echo in a wideband voice conference
1119237225Apparatus with dynamic audio signal pre-conditioning and methods therefor
1129232072Participant controlled spatial AEC
1139232071Optimizing audio processing functions by dynamically compensating for variable distances between speaker(s) and microphone(s) in a mobile device
1149231656System and method to reduce crosstalk of digital subscriber lines

2015

1159225843Method, system and computer program product for acoustic echo cancellation
1169225842Determining an acoustic coupling between a far-end talker signal and a combined signal
1179224393Noise estimation for use with noise reduction and echo cancellation in personal communication
1189219958Systems and methods for acoustic echo cancellation with wireless microphones and speakers
1199219456Correcting clock drift via embedded sin waves
1209215328Beamforming apparatus and method based on long-term properties of sources of undesired noise affecting voice quality
1219215327Methods and apparatuses for multi-channel acoustic echo cancelation
1229210505Maintaining spatial stability utilizing common gain coefficient
1239210504Processing audio signals
1249210502Echo cancelling device
1259210270Echo cancellation for ultrasound
1269203972Efficient audio signal processing in the sub-band regime
1279203527Sharing a designated audio signal
1289197974Directional audio capture adaptation based on alternative sensory input
1299191740Method and apparatus for in-ear canal sound suppression
1309191519Echo suppressor using past echo path characteristics for updating
1319191494Device, system, and method for performing echo cancellation in different modes of a communication device
1329185506Comfort noise generation based on noise estimation
1339185233Audio communication device and method using fixed echo cancellation filter coefficients
1349184791Selective adaptive audio cancellation algorithm configuration
1359179224Hearing device with adaptive feedback-path estimation
1369172817Communication system
1379172816Echo suppression
1389172791Noise estimation algorithm for non-stationary environments
1399171551Unified microphone pre-processing system and method
1409167342Echo suppression
1419160864Systems and methods for stereo echo cancellation
1429154873Echo suppression
1439154635Signal processing method, signal processing device, and signal processing program
1449148724Audio system signal processing control using microphone movement information
1459143862Correlation based filter adaptation
1469143621Computation saving echo canceller for a wide band audio signal
1479142223Sound processing to produce target volume level
1489136906Detection of double talk in telecommunications networks
1499136905Multi-receiving terminal echo cancellation method and system
1509131317Sharing public addressing system using personal communication devices in an ad-hoc network
1519131316Sharing public addressing system using personal communication devices in an ad-hoc network
1529131041Using an auxiliary device sensor to facilitate disambiguation of detected acoustic environment changes
1539130747Software radio frequency canceller
1549129594Signal processing apparatus and signal processing method
1559124708Far-end sound quality indication for telephone devices
1569118769Mobile phone and method for processing call signal thereof
1579112951Acoustic echo suppression
1589100736Control of an adaptive feedback cancellation system based on probe signal injection
1599100466Method for processing an audio signal and audio receiving circuit
1609097795Proximity detecting apparatus and method based on audio signals
1619094496System and method for stereophonic acoustic echo cancellation
1629088336Systems and methods of echo and noise cancellation in voice communication
1639083785Systems and methods selectively excluding tones from vectoring
1649083783Detecting double talk in acoustic echo cancellation using zero-crossing rate
1659083782Dual beamform audio echo reduction
1669083776Echo mitigation in a conference call
1679076426Training an echo canceller in severe noise
1689065896Method and system for sampling rate mismatch correction of transmitting and receiving terminals
1699065895Non-linear echo cancellation
1709060052Single channel, binaural and multi-channel dereverberation
1719042567Acoustic echo cancellation system
1729042535Echo control optimization
1739036816Frequency domain acoustic echo cancellation using filters and variable step-size updates
1749036815Method for acoustic echo cancellation and system thereof
1759036814Echo suppression
1769025764Detection and suppression of returned audio at near-end
1779025763Apparatus and method for cancelling wideband acoustic echo
1789025762System and method for clock synchronization of acoustic echo canceller (AEC) with different sampling clocks for speakers and microphones
1799020144Cross-domain processing for noise and echo suppression
1809008302Audio acoustic echo cancellation for video conferencing
1819001994Non-uniform adaptive echo cancellation
1829001974System for providing telephony and data services
1838983058Echo canceller and a method thereof
1848983057Step size control for acoustic echo cancellation
1858971523Over-sampled single-sided subband echo cancellation
1868971522Noise reduction
1878964967Subband domain echo masking for improved duplexity of spectral domain echo suppressors
1888958544Time-alignment of crosstalk acquisition phases between multiple joining lines
1898953777Echo path change detector with robustness to double talk
1908953776Particular signal cancel method, particular signal cancel device, adaptive filter coefficient update method, adaptive filter coefficient update device, and computer program
1918942370Filter bank optimization for acoustic echo cancellation
1928938066Methods, apparatus and articles of manufacture to cancel echo for communication paths having long bulk delays
1938934622Method for detecting double-talk condition and system using the same
1948934621Echo prevention circuit having signal subtracter feature
1958934620Acoustic echo cancellation for high noise and excessive double talk

2014

1968923530Speakerphone feedback attenuation
1978923509Controlling echo in a wideband voice conference
1988923508Half-duplex speakerphone echo canceler
1998917864Full-duplex audio communication terminal
2008917863Method and device for data processing in a digital subscriber line environment
2018917639Eliminating false audio associated with VoIP communications
2028913737Echo canceller and microphone apparatus
2038897429Communication circuit employing optocoupler
2048892450Signal clipping protection using pre-existing audio gain metadata
2058885840Device, system and method for measurement of media consumption in digital media terminals
2068885815Null-forming techniques to improve acoustic echo cancellation
2078879721Audio communication system
2088879720Acoustic echo cancellation using a variable length adaptive filter
2098873742Echo canceller auditor
2108873741Methods, apparatuses and computer program products for providing active echo-cancellation for systems combining voice communication and synchronous audio content
2118873740Enhanced echo cancellation
2128867735Echo cancelling device, communication device, and echo cancelling method having the error signal generating circuit
2138861713Clipping based on cepstral distance for acoustic echo canceller
2148861712Method, apparatus, and system for reducing line-to-line crosstalk during transmission of digital subscriber line service
2158861711Echo cancellation apparatus, conferencing system using the same, and echo cancellation method
2168855295Acoustic echo cancellation using blind source separation
2178831210Method and system for detection of onset of near-end signal in an echo cancellation system
2188824667Time-domain acoustic echo control
2198824666Noise cancellation for phone conversation
2208811603Echo canceler circuit and method
2218811602Full duplex speakerphone design using acoustically compensated speaker distortion
2228811601Integrated echo cancellation and noise suppression
2238792649Echo canceller used for voice communication
2248787561Techniques for implementing adaptation control of an echo canceller to facilitate detection of in-band signals
2258787560Method for determining a set of filter coefficients for an acoustic echo compensator
2268774399System for reducing speakerphone echo
2278774398Transceiver
2288767951Talk deciding system
2298761386Sound processing apparatus, method, and program
2308761385Signal processing method, signal processing device, and signal processing program
2318761349Systems and methods of monitoring performance of acoustic echo cancellation
2328750494Clock skew compensation for acoustic echo cancellers using inaudible tones
2338750493Method and system for stereo echo cancellation for VoIP communication systems
2348750492Reducing the feedback overhead during crosstalk precoder initialization
2358750491Mitigation of echo in voice communication using echo detection and adaptive non-linear processor
2368744069Removing near-end frequencies from far-end sound
2378737601Echo canceller
2388731184Performance testing of echo cancellers using a white noise test signal
2398730852Eliminating false audio associated with VoIP communications
2408724799Operating points for spectrum management in digital subscriber lines
2418724798System and method for acoustic echo cancellation using spectral decomposition
2428718275Low complex and robust delay estimation
2438718273Apparatus for processing echo signal and method thereof
2448712068Acoustic echo cancellation
2458712034Adaptive analog echo/next cancellation
2468705758Audio processing device and method for reducing echo from a second signal in a first signal
2478694326Communication terminal and communication method
2488693698Method and apparatus to reduce non-linear distortion in mobile computing devices
2498693678Device and method for controlling damping of residual echo
2508693677Techniques for updating filter coefficients of an adaptive filter
2518687797Method and system for a dual echo canceller
2528670555Communication apparatus for rapidly adjusting analog echo cancellation circuit and related echo cancellation method
2538670554Method for encoding multiple microphone signals into a source-separable audio signal for network transmission and an apparatus for directed source separation
2548666058Time domain adaptive filter bank for network echo reduction or cancellation
2558654967System for conditioning echo response of loop start trunk line
2568644496Echo suppressor, echo suppressing method, and computer readable storage medium
2578644495Echo canceler
2588644494Echo canceler
2598634547Echo canceller operative in response to fluctuation on echo path
2608634546Signal processing device, echo canceller, and signal processing method
2618630405Echo removing apparatus
2628625776Detection and suppression of returned audio at near-end
2638625775Method and system for reducing echo and noise in a vehicle passenger compartment environment

2013

2648619970Echo cancellers and echo cancelling methods
2658615075Method and apparatus for removing noise signal from input signal
2668606573Voice recognition improved accuracy in mobile environments
2678605891Adaptive gain control based on echo canceller performance information
2688605890Multichannel acoustic echo cancellation
2698600040Apparatus and method for convergence control
2708600039System for low complexity adaptive ECHO and NEXT cancellers
2718600038System and method for echo cancellation
2728600037Audio quality and double talk preservation in echo control for voice communications
2738594320Hybrid echo and noise suppression method and device in a multi-channel audio signal
2748588404Method and apparatus for acoustic echo cancellation in VoIP terminal
2758582781Echo modulation methods and systems
2768582754Method and system for echo cancellation in presence of streamed audio
2778582577Modem with voice processing capability
2788577019Methods, apparatus and articles of manufacture to detect echo during teleconferences
2798571204Apparatus and method for echo control in parameter domain
2808565416Cache-based echo canceller
2818565415Gain and spectral shape adjustment in audio signal processing
2828559656System and method for automatic microphone volume setting
2838542818Vehicle call device, call system, center, and calling method
2848538037Audio 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
2858538008Acoustic echo canceler using an accelerometer
2868520821Systems and methods for switching between computer and presenter audio transmission during conference call
2878515086Method and system for clock drift compensation
2888515055Adaptive filtering with flexible selection of algorithm complexity and performance
2898515054Voice and data exchange over a packet based network with echo cancellation
2908503669Integrated latency detection and echo cancellation
2918499020Method and system for estimating and applying a step size value for LMS echo cancellers
2928498423Device for and a method of processing audio signals
2938498407Systems and methods for double-talk detection in acoustically harsh environments
2948488776Echo suppressing method and apparatus
2958488745Endpoint echo detection
2968483398Methods and systems for reducing acoustic echoes in multichannel communication systems by reducing the dimensionality of the space of impulse responses
2978472617Interaction between echo canceller and packet voice processing
2988472616Self calibration of envelope-based acoustic echo cancellation
2998467544Filter coefficient setting device and echo prevention device
3008467521Echo canceler circuit and method
3018463331Deterministic characterization and reduction of acoustic echo
3028462936Adaptive delay compensation for acoustic echo cancellation
3038452002Methods, apparatus and articles of manufacture to cancel echo for communication paths having long bulk delays
3048441515Method and apparatus for minimizing acoustic echo in video conferencing
3058433074Echo suppressing method and apparatus
3068433061Reducing echo
3078433060Method and system for stereo echo cancellation for VoIP communication systems
3088433059Echo canceller canceling an echo according to timings of producing and detecting an identified frequency component signal
3098433058Method and system for distributed speakerphone echo cancellation
3108428247Echo mitigation in a conference call
3118422663Structure and method for echo reduction without loss of information
3128416946System and process for regression-based residual acoustic echo suppression
3138411847Acoustic echo canceller
3148411846Echo path change detection in telecommunications networks
3158406416Configuring virtual noise parameters of very high-speed digital subscriber line
3168406415Privacy modes in an open-air multi-port conferencing device
3178401178Multiple microphone switching and configuration
3188401177Combined sidetone and hybrid balance
3198401176Acoustic echo canceller with multimedia training signal
3208396206Multi-channel communication device and methods for reducing echoes by inserting a training sequence under a spectral mask
3218391504Method and system for artificial reverberation employing dispersive delays
3228391472Acoustic echo cancellation solution for video conferencing
3238391471Echo suppressing apparatus, echo suppressing system, echo suppressing method and recording medium
3248385539Method and arrangement for controlling adaptive filters
3258374851Voice activity detector and method
3268374355Robust and efficient frequency-domain decorrelation method
3278369512Device 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
3288369251Timestamp quality assessment for assuring acoustic echo canceller operability
3298364480Method and apparatus for controlling echo in the coded domain
3308363821Apparatus and method for canceling echo
3318355511System and method for envelope-based acoustic echo cancellation
3328351597Electronic device, echo canceling method thereof, non-transitory computer readable medium, circuit substrate, and portable telephone terminal device
3338345860Method and system for detection of onset of near-end signal in an echo cancellation system

2012

3348340278Method and apparatus for cross-talk resistant adaptive noise canceller
3358335319Double talk detection method based on spectral acoustic properties
3368335311Communication apparatus capable of echo cancellation
3378331552Detection of double talk in telecommunications networks
3388325911Personal speakerphone device
3398325910Echo cancelling device, communication device, and echo cancelling method having the error signal generating circuit
3408325909Acoustic echo suppression
3418320577Method and apparatus for multi-channel audio processing using single-channel components
3428320554Acoustic echo canceller clock compensation
3438320553Enhanced echo cancellation
3448320552Delay estimator
3458315380Echo suppression method and apparatus thereof
3468315379Single transducer full duplex talking circuit
3478311234Echo canceller and communication audio processing apparatus
3488306215Echo canceller for eliminating echo without being affected by noise
3498306214Method and system for clear signal capture
3508300801System and method for telephone based noise cancellation
3518295476Echo canceller and echo cancellation method
3528295475Selective glitch detection, clock drift compensation, and anti-clipping in audio echo cancellation
3538295474Echo canceller with heavy double-talk estimation
3548290143Delay estimator
3558290142Echo cancellation in a portable conferencing device with externally-produced audio
3568290141Techniques for comfort noise generation in a communication system
3578290140Sound event processing with echo analysis
3588284949Multi-channel acoustic echo cancellation system and method
3598284007Magnetic package for a communication system
3608280037Echo canceller having its effective filter taps adaptively controlled with echo cancellation amount monitored
3618280036Configuring the virtual noise parameters of a digital subscriber line
3628275142Acoustic echo cancellation system
3638275139Linear full duplex system and method for acoustic echo cancellation
3648275120Adaptive acoustic echo cancellation
3658271051Method and system for double-end talk detection, and method and system for echo elimination
3668265263Delayed adaptation structure for improved double-talk immunity in echo cancellation devices
3678259928Method and apparatus for reducing timestamp noise in audio echo cancellation
3688259927Method and arrangement for the adaptive filtering of signals
3698259926System and method for 2-channel and 3-channel acoustic echo cancellation
3708259917System and method for generating one-way speech signal samples
3718254561Headset adapter with host phone detection and characterization
3728254560Oscillation-echo preventing circuit and microphone/speaker unit
3738238548Controlling echo during double-talk in a voice conference
3748238547Sound pickup apparatus and echo cancellation processing method
3758238546Echo canceler circuit and method
3768233632Method and apparatus for multi-channel audio processing using single-channel components
3778229107Echo canceler
3788223960Apparatus and method for removing an echo signal in a signal transmission/reception apparatus of a communication system
3798223959Echo cancellation in which sound source signals are spatially distributed to all speaker devices
3808223943Systems and methods for computer and voice conference audio transmission during conference call via PSTN phone
3818218757Echo canceler
3828213598Harmonic distortion residual echo suppression
3838213597Audio communication device and methods for reducing echoes by inserting a training sequence under a spectral mask
3848213596Method of accelerating the training of an acoustic echo canceller in a full-duplex beamforming-based audio conferencing system
3858208623Echo processing method and device
3868208622Performance testing of echo cancellers using a white noise test signal
3878208621Systems and methods for acoustic echo cancellation
3888208462Line driver for an adaptive hybrid circuit
3898204210Method and system for nonlinear acoustic echo cancellation in hands-free telecommunication devices
3908204209Full duplex hands-free telephone system
3918199927Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter
3928194852Low complexity echo compensation system
3938194851Voice processing apparatus, voice processing system, and voice processing program
3948194850Method and apparatus for voice communication
3958189767Method and system for clear signal capture
3968189766System and method for blind subband acoustic echo cancellation postfiltering
3978189765Multichannel echo canceller
3988184802Adaptive analog echo/next cancellation
3998184801Acoustic echo cancellation for time-varying microphone array beamsteering systems
4008184790Notification of dropped audio in a teleconference call
4018175871Apparatus and method of noise and echo reduction in multiple microphone audio systems
4028175261Systems and methods for adaptive echo cancellation
4038175260Echo cancellation
4048170226Acoustic echo cancellation and adaptive filters
4058170200Method and apparatus for percussive noise reduction in a conference
4068170199Echo canceller
4078160241Communication terminal device with echo canceller and its echo canceling method
4088160240Echo cancellation balance using noise generator and average power detection
4098160239Echo canceller and speech processing apparatus
4108155304Filter bank optimization for acoustic echo cancellation
4118155303System and method for cancelling echo
4128155302Acoustic echo canceller
4138150027Control of echo cancellation filters
4148144863Method and apparatus for echo cancellation
4158144862Method and apparatus for the detection and suppression of echo in packet based communication networks using frame energy estimation
4168139760Estimating delay of an echo path in a communication system
4178130941Echo canceler
4188130940Echo detection
4198126161Acoustic echo canceller system
4208121260Method and apparatus for retraining of echo cancellation
4218116448Acoustic echo canceler
4228107619Method, system and apparatus for controlling a network interface device
4238107617Audio processor
4248107616Acoustic echo canceller
4258103011Signal detection using multiple detectors
4268098813Communication system
4278094809Frame-based level feedback calibration system for sample-based predictive clipping
4288090094Echo canceller
4298090093Echo canceller

2011

4308085930Communication system
4318081753Hybrid echo canceller controllers
4328077859Adaptive analog echo/NEXT cancellation
4338077858Echo canceler and echo canceling method
4348077857Portable speakerphone device with selective mixing
4358077642Methods and apparatus for signal echo cancellation and transmitter calibration in full duplex systems
4368073133Echo canceler and echo canceling method
4378073132Echo canceler and echo canceling program
4388073131Portable device case with corner protector
4398068884Acoustic echo reduction circuit for a "hands-free" device usable with a cell phone
4408054966Echo cancellation and noise reduction adaptation during ringing signal playback
4418045703Apparatus and method for echo-cancellation
4428045702Multi-path active hybrid circuit
4438041028Double-talk detection
4448041027Electricity echo cancellation device and method
4458036376Echo prevention circuit having adaptive digital filter
4468032365Method and apparatus for controlling echo in the coded domain
4478031863Apparatus and method for controlling acoustic echo cancellation in mobile communication terminal
4488023641Spectral domain, non-linear echo cancellation method in a hands-free device
4498019076Portable speakerphone device and subsystem utilizing false doubletalk detection
4508019075Hybrid echo canceller controllers
4518014519Cross-correlation based echo canceller controllers
4528014517Method and apparatus for enhanced convergence of the normalized LMS algorithm
4538014516Method and apparatus for echo cancellation
4547995745Structure and method for echo reduction without loss of information
4557991146Anti-howling structure
4567970124Adaptive gain control based on echo canceller performance information
4577970123Adaptive coupling equalization in beamforming-based communication systems
4587970122Circuit method and system for transmitting information
4597965834Method and system for clear signal capture
4607933295Cable modem with voice processing capability
4617925008Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus
4627925007Multi-input channel and multi-output channel echo cancellation
4637925006Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus
4647920697Interaction between echo canceller and packet voice processing
4657917562Method and system for estimating and applying a step size value for LMS echo cancellers
4667899195Adaptive howling canceller
4677894598System for limiting receive audio
4687881460Configuration of echo cancellation
4697881459Acoustic echo canceller using multi-band nonlinear processing
4707876892Multiple echo cancellation using a fixed filter delay
4717876718Echo reduction
4727869587Method and apparatus for canceling acoustic echo in a mobile terminal
4737864718Echo cancellation device for full duplex communication systems

2010

4747860236Method and system for echo cancellation in a network switch
4757856098Echo cancellation and control in discrete cosine transform domain
4767856097Echo canceling apparatus, telephone set using the same, and echo canceling method
4777844365Field-mounted process device
4787835774Removal of local duplication voice on conference calls
4797831036Method to reduce training time of an acoustic echo canceller in a full-duplex beamforming-based audio conferencing system
4807831035Integration of a microphone array with acoustic echo cancellation and center clipping
4817826609Method and apparatus for digital near-end echo/near-end crosstalk cancellation with adaptive correlation
4827822194Method and system for low delay echo cancelling
4837822193Estimation method and apparatus
4847822192Sound event processing with echo analysis
4857821957Acknowledgment of media waveforms between telecommunications endpoints
4867817797Method and apparatus for detecting echo path changes in an acoustic echo canceller
4877813499System and process for regression-based residual acoustic echo suppression
4887813498Full-duplex communication device and method of acoustic echo cancellation therein
4897813497Echo canceller with interference-level controlled step size
4907813496Method for reducing a computational complexity in non-linear filter arrangements as well as corresponding filter arrangements
4917809129Acoustic echo cancellation based on noise environment
4927796767Howling detection method, device, and acoustic device using the same
4937792281Delay estimation and audio signal identification using perceptually matched spectral evolution
4947792280Narrow band tone detection in echo canceling system
4957787613Method and apparatus for double-talk detection in a hands-free communication system
4967783478Two stage frequency subband decomposition
4977783032Method and system for processing subband signals using adaptive filters
4987778408Method and apparatus for acoustic echo cancellation utilizing dual filters
4997773743Integration of a microphone array with acoustic echo cancellation and residual echo suppression
5007773742Echo canceller
5017773741Voice and data exchange over a packet based network with echo cancellation
5027769186System and method facilitating acoustic echo cancellation convergence detection
5037769162Acoustic echo canceller with multimedia training signal
5047764783Acoustic echo cancellation with oversampling
5057747002Method and system for stereo echo cancellation for VoIP communication systems
5067747001Speech signal processing with combined noise reduction and echo compensation
5077742592Method and device for removing echo in an audio signal
5087742387Cancellation of crosstalk energy in communication loops
5097742386Multiple channel interference cancellation
5107738655Interference canceller tap sharing in a communications transceiver
5117734036Dynamic attenuation method and apparatus for optimizing voice quality using echo cancellers
5127734035Method and apparatus for soft-response echo suppression
5137724893Method of adaptation step control in echo cancellers
5147724892Method and apparatus for optimizing speakerphone performance based on tilt angle
5157724891Method to reduce acoustic coupling in audio conferencing systems
5167720232Speakerphone
5177711108Fast echo canceller reconvergence after TDM slips and echo level changes
5187711107Perceptual masking of residual echo
5197706549Broadside small array microphone beamforming apparatus
5207693291Multi-channel frequency-domain adaptive filter method and apparatus
5217693276Method of measuring distortion and determining residue-echo threshold in loop start trunk circuits
5227688968Adaptive analog echo/next cancellation
5237684559Acoustic echo suppressor for hands-free speech communication
5247680266System and method for adaptive reduced-rank parameter estimation using an adaptive decimation and interpolation scheme
5257680265Echo canceler circuit and method
5267672447Frequency domain echo canceller
5277672446Echo processing method and device
5287672445Method and system for nonlinear echo suppression
5297649988Comfort noise generator using modified Doblinger noise estimate
5307643630Echo suppression with increment/decrement, quick, and time-delay counter updating

2009

5317636436Method for the performance testing of echo cancellers using an artificial segmented test signal
5327636435Device and method for processing audio signals and telecommunication set equipped with such a processing device
5337627111Noise matching for echo cancellers
5347620172Method and system for eliminating noises and echo in voice signals
5357613291Echo path change detection using dual sparse filtering
5367599483Echo canceler circuit and method
5377599432Method and apparatus for dynamically inserting gain in an adaptive filter system
5387596220Echo cancellation using adaptive IIR and FIR filters
5397583768Apparatus for canceling intersymbol interference in semiconductor memory device and method thereof
5407577248Method and apparatus for echo cancellation, digit filter adaptation, automatic gain control and echo suppression utilizing block least mean squares
5417564964Echo canceller
5427558729Music detection for enhancing echo cancellation and speech coding
5437555117Path change detector for echo cancellation
5447555116Real time processing and management method for cancelling out the echo between a loudspeaker and a microphone of a computer terminal
5457554933Echo cancellation device for full duplex communication systems
5467552050Speech recognition system and method utilizing adaptive cancellation for talk-back voice
5477548616Termination device for a telephone line
5487545926Echo and noise cancellation
5497539300Echo canceller with enhanced infinite and finite ERL detection
5507539299Office-line trunk circuit operating on ground-start and loop-start modes, method of controlling same, and control program for same
5517536007Echo cancellation using adaptive IIR and FIR filters
5527536006Method and system for near-end detection
5537532717Echo canceler with automatic gain control of echo cancellation signal
5547525952Method and apparatus for determining the source of user-perceived voice quality degradation in a network telephony environment
5557515704Method, apparatus and articles incorporating a step size control technique for echo signal cancellation
5567512227Echo canceller controller
5577508931Method for detecting echo path changes in echo cancellers
5587502461Echo cancellation in a communication network
5597483530Apparatus for separating blind source signals having systolic array structure
5607477735System and method for enhanced stereo audio

2008

5617471788Echo cancellers for sparse channels
5627457353Method and system for mitigating Fourier transform side lobes
5637454011ADSL communication system having echo canceller and method for downloading filter coefficient of the echo canceller
5647450714Echo canceller having improved non-linear processor
5657450713Echo canceller employing dual-H architecture having improved non-linear echo path detection
5667443978Method and apparatus for audio coding with noise suppression
5677436787Transceiver for full duplex communication systems
5687433463Echo cancellation and noise reduction method
5697428304Method and apparatus for detecting subscriber alerting signal tones and customer premises equipment alerting signal tones to non-echo canceling modems
5707426270Method and system for clear signal capture
5717409057Nonlinear echo compensator for class B transmitter line driver
5727408891Echo canceller employing H-register and storage register
5737403610Echo canceller employing dual-H architecture having split adaptive gain settings
5747403609Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus
5757403608Echo processing devices for single-channel or multichannel communication systems
5767386120Echo canceller having a frequency domain active region location estimator
5777359504Method and apparatus for reducing echo and noise
5787352858Multi-channel echo cancellation with round robin regularization
5797352687Mixed domain cancellation
5807333605Acoustic echo cancellation with adaptive step size and stability control
5817319748Device and method for suppressing echo in telephones

2007

5827313233Tone clamping and replacement
5837310425Multi-channel frequency-domain adaptive filter method and apparatus
5847295670Howling suppression device and howling suppression method
5857280654Modified affine projection algorithm for non-stationary signal
5867277538Distortion compensation in an acoustic echo canceler
5877269211Residual echo reduction for a full duplex transceiver
5887266092Adaptive frequency duplexing system and method
5897260214Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections
5907260213Telephone echo canceller
5917251322Systems and methods for echo cancellation with arbitrary playback sampling rates
5927242762Monitoring and control of an adaptive filter in a communication system
5937236586Synchronization of echo cancellers in a voice processing system
5947236463Transceiver for echo and near-end crosstalk cancellation without loop timing configuration
5957221755Method of capturing constant echo path information in a full duplex speakerphone
5967218730System and method for analysis and filtering of signals in a telecommunications network
5977215765Method and apparatus for pure delay estimation in a communication system
5987212628Echo cancellation/suppression and double-talk detection in communication paths
5997209566Method and apparatus for determining a nonlinear response function for a loudspeaker
6007206561Radio equipment
6017206404Communications system and method utilizing centralized signal processing
6027197146Microphone array signal enhancement
6037194084System and method for stereo conferencing over low-bandwidth links
6047190800Howling control device and howling control method
6057181000Voice transmission device and voice transmission system
6067180869Comprehensive echo control system
6077177419Methods and apparatuses for detecting and reducing non-linear echo in a multi-carrier communication system
6087177416Channel control and post filter for acoustic echo cancellation
6097173962High-speed modem with uplink remote-echo canceller
6107171003Robust and reliable acoustic echo and noise cancellation system for cabin communication
6117170927Methods and apparatus for an ADSL transceiver
6127167568Microphone array signal enhancement

2006

6137155018System and method facilitating acoustic echo cancellation convergence detection
6147154867Echo reduction
6157151828Circuit arrangement for the analogue suppression of echoes
6167146003Noise level calculator for echo canceller
6177142533Echo canceller and compression operators cascaded in time division multiplex voice communication path of integrated access device for decreasing latency and processor overhead
6187136670Mobile communication device with audio recorder
6197136471Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
6207133442Rapid identification of transmission media channel characteristics
6217106856Method and apparatus for performing echo cancellation within a communication network
6227099458Downlink activity and double talk probability detector and method for an echo canceler circuit
6237095848Power up reset circuit for line powered circuit
6247095847DC/DC converter and subscriber line interface circuit
6257092516Echo processor generating pseudo background noise with high naturalness
6267092513Limiting maximum gain in duplex communications devices including telephone sets
6277085374Distributed echo cancelling
6287085245Coefficient domain history storage of voice processing systems
6297072466Method and apparatus for canceling echo in a telephone communication system
6307068780Hybrid echo canceller
6317068711Multi-function equalizer arrangement
6327065206Method and apparatus for adaptive echo and noise control
6337054438Method and apparatus for active reduction of speakerphone singing
6347054437Statistical adaptive-filter controller
6357050577Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections
6367050576Double talk, NLP and comfort noise
6377050575Echo canceler coefficient update apparatus and method
6387050545Methods and apparatus for echo cancellation using an adaptive lattice based non-linear processor
6397046795Method and apparatus for active latency characterization
6407043014Apparatus and method for time-alignment of two signals
6417043013Method for adaptive control of multichannel acoustic echo cancellation system and device therefor
6427039181Consolidated voice activity detection and noise estimation
6437035415Method and device for acoustic echo cancellation combined with adaptive beamforming
6447035398Echo cancellation processing system
6457035397System and method for updating filter coefficients and echo canceller including same
6467035396Configurable echo canceller
6477031461Robust adaptive filter for echo cancellation
6487031458Method and apparatus for isolation in a data access arrangement using analog encoded pulse signaling
6497027591Integrated noise cancellation and residual echo suppression
6507023812System and method for improving modem transmission through private branch exchanges, central offices, and other systems
6517020279Method and system for filtering a signal and for providing echo cancellation
6527020276Frequency sensitive inductance device in POTS splitter design
6537020246Time domain reflected signal measurement using statistical signal processing
6547016490Circuit board capacitor structure for forming a high voltage isolation barrier
6557016489System and method for performing echo cancellation for non-linearities
6567016488Method and apparatus for non-linear processing of an audio signal
6577016487Digital echo cancellation device
6587009945Dual-mode analog/digital adaptive echo cancellation in communication systems with asymmetric spectrum
6597003103Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit
6607003101Subband echo location and double-talk detection in communication systems
6617003100Modem with enhanced echo canceler
6627003097Synchronization of echo cancellers in a voice processing system
6637003096Full duplex telephone set using echo cancellation and side tone management for high gain stability
6647003095Acoustic echo canceler and handsfree telephone set
6657003094Adaptive interference cancellation for ADSL
6667002897Multiple channel interference cancellation
6676999582Echo cancelling/suppression for handsets
6686996231Step size convergence control
6696983047Echo canceling system for a bit pump and method of operating the same

2005

6706968352Device for digital processing with frequency filtering and reduced computation complexity
6716968064Adaptive thresholds in acoustic echo canceller for use during double talk
6726963642Band-by-band full duplex communication
6736961422Gain control method for acoustic echo cancellation and suppression
6746959084Network interface unit shelf assembly with multi-positionable customer interface module
6756954530Echo cancellation filter
6766952474Phone privacy and unobtrusiveness via voice cancellation
6776952473System and method for echo assessment in a communication network
6786950513Impulse response setting method for the 2-channel echo canceling filter, a two-channel echo canceller, and a two-way 2-channel voice transmission device
6796947550Acoustic echo cancellation
6806947549Echo canceller
6816937722Method and apparatus for echo cancellation
6826934387Method and apparatus for digital near-end echo/near-end crosstalk cancellation with adaptive correlation
6836934386Echo canceller
6846932187Protective acoustic cover assembly
6856931123Echo cancellation
6866931121Dual personality analog port
6876931120Telephone-computer interface
6886928160Estimating bulk delay in a telephone system
6896925178Returning ringing signals through the tip amplifier of subscriber-line interface circuitry
6906925177Echo canceler compensating for amplifier saturation and echo amplification
6916925176Method for enhancing the acoustic echo cancellation system using residual echo filter
6926922403Acoustic echo control system and double talk control method thereof
6936917688Adaptive noise cancelling microphone system
6946917682Method and device for echo cancelling
6956912281Route delay sensitive echo cancellation
6966909041Sound field control method and sound field control system
6976904146Full duplex echo cancelling circuit
6986898281System and method for filtering echo/NEXT signal interferrence
6996895094Adaptive identification method and device, and adaptive echo canceller implementing such method
7006891948Echo canceller
7016889066Network echo suppression in mobile stations
7026879670Collective housing intercom apparatus
7036873704Apparatus for removing echo from speech signals with variable rate
7046868158Echo processing apparatus
7056859531Residual echo estimation for echo cancellation
7066856685Feed arrangement for a subscriber loop with multi-level current regulation capability
7076850783Methods and apparatus for mitigating the effects of microphone overload in echo cancelation systems
7086847930Analog voice activity detector for telephone
7096842516Digital adaptive filter and acoustic echo canceller using the same
7106839426Echo cancellor

2004

7116836547Protecting an echo canceller against random transitions in echo paths
7126834108Method for improving acoustic noise attenuation in hand-free devices
7136829353Mechanism for preventing clipping of pulse metering signals in telephone line card channels
7146826279Base band echo cancellation using laguerre echo estimation
7156816591Voice switching system and voice switching method
7166813351Method and apparatus for echo cancellation that suppresses echo leak through
7176804350Method and apparatus for improving echo cancellation in non-voip systems
7186804203Double talk detector for echo cancellation in a speech communication system
7196798881Noise reduction circuit for telephones
7206798754Acoustic echo cancellation equipped with howling suppressor and double-talk detector
7216795551Circuit for removing in-band FSK signals without muting of receiver
7226795547Full duplex speaker-phone providing increased loop stability
7236785384Two-step algorithm for training an echo cancellation filter
7246785382System and method for controlling a filter to enhance speakerphone performance
7256778671Method of reference to echo time alignment for facilitation of echo cancellation
7266771771Method and device for echo cancellation
7276771769Method and apparatus for active reduction of speakerphone singing
7286771701Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis
7296768723Method of operating a full duplex speakerphone echo canceller
7306766019Method and apparatus for performing double-talk detection in acoustic echo cancellation
7316765971System method and computer program product for improved narrow band signal detection for echo cancellation
7326760436Echo canceling apparatus determining dynamically changing echo component
7336757385Symmetry based subband acoustic echo cancellation
7346757384Robust double-talk detection and recovery in a system for echo cancelation
7356754337Telephone having four VAD circuits
7366751315High bandwidth phone line transceiver with capacitor isolation
7376751313Method and apparatus for an improved echo canceller
7386748086Cabin communication system without acoustic echo cancellation
7396747581Techniques for variable sample rate conversion
7406744887Acoustic echo processing system
7416744884Speaker-phone system change and double-talk detection
7426738480Method and device for cancelling stereophonic echo with frequency domain filtering
7436731750xDSL multiple-point interface device
7446721411Audio conference platform with dynamic speech detection threshold
7456718041Echo attenuating method and device
7466718036Linear predictive coding based acoustic echo cancellation
7476718035Echo canceller employing dual-H architecture having split adaptive gain settings
7486711259Method and apparatus for noise suppression and side-tone generation
7496707912Method and apparatus for setting a step size for an adaptive filter coefficient of an echo canceller
7506707910Detection of the speech activity of a source
7516704415Echo canceler
7526700979Echo canceller
7536700977Method and apparatus for cancelling multi-channel echo
7546700976Noise canceler system with adaptive cross-talk filters
7556694020Frequency domain stereophonic acoustic echo canceller utilizing non-linear transformations
7566694018Echo canceling apparatus and method, and voice reproducing apparatus
7576683961Process and apparatus for eliminating loudspeaker interference from microphone signals
7586674865Automatic volume control for communication system

2003

7596665401Method for canceling echo
7606662027Method of arbitrating speakerphone operation in a portable communication device for eliminating false arbitration due to echo
7616661895Zero-delay structure for sub-band echo cancellation
7626658107Methods and apparatus for providing echo suppression using frequency domain nonlinear processing
7636636604Method and device for suppressing echo in a hands free device such as a telephone
7646628781Methods and apparatus for improved sub-band adaptive filtering in echo cancellation systems
7656628779Method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors
7666622030Echo suppression using adaptive gain based on residual echo energy
7676618481Method for improving acoustic sidetone suppression in hands-free telephones
7686611601Echo sound signal suppressing apparatus
7696608898Band pass and notch filters for echo reduction with less phase distortion
7706608897Double-talk insensitive NLMS algorithm
7716606382System and method for implementation of an echo canceller
7726597787Echo cancellation device for cancelling echos in a transceiver unit
7736590975Echo canceller
7746590974Howling controller
7756580795Echo canceller for a full-duplex communication system and method therefor
7766580794Acoustic echo canceler with a peak impulse response detector
7776577731Method and apparatus of cancelling multi-channel echoes
7786574337Adaptive echo canceler undoing adaptations made during double-talk
7796574336Echo suppressor and non-linear processor of echo canceller
7806570986Double-talk detector
7816570985Echo canceler adaptive filter optimization
7826563925Method and apparatus for space-time echo cancellation
7836563803Acoustic echo canceller
7846560332Methods and apparatus for improving echo suppression in bi-directional communications systems
7856556682Method for cancelling multi-channel acoustic echo and multi-channel acoustic echo canceller
7866556564Scheduled internet protocol telephone instrument system
7876553122Method and apparatus for multi-channel acoustic echo cancellation and recording medium with the method recorded thereon
7886549627Generating calibration signals for an adaptive beamformer
7896546099Arrangement for suppressing an interfering component of an input signal
7906545985Echo cancellation mechanism
7916539091Apparatus for sidetone damping
7926535604Voice-switching device and method for multiple receivers
7936516063Echo canceller having improved non-linear processor
7946510225Ultrasonically-calibrated fast-start echo canceller for cellular and pcs telephone car kits
7956510224Enhancement of near-end voice signals in an echo suppression system
7966507653Desired voice detection in echo suppression
7976507652Echo canceller employing dual-H architecture having improved non-linear echo path detection

2002

7986496581Coupled acoustic echo cancellation system
7996487178Methods and apparatus for providing volume control in communicating systems including a linear echo canceler
8006459942Acoustic coupling compensation for a speakerphone of a system
8016453041Voice activity detection system and method
8026449361Control method and device for echo canceller
8036442275Echo canceler including subband echo suppressor
8046434235Acoustic echo canceler
8056434234Process for improving the echo suppression in a telecommunications system
8066434110Full-duplex speakerphone circuit including a double-talk detector
8076430295Methods and apparatus for measuring signal level and delay at multiple sensors
8086424720Method and device for reducing multi-channel acoustic echo and adapting sound to space conditions
8096408070Method and apparatus for echo control in a communication system
8106404886Method and apparatus for echo cancelling with multiple microphones
8116389440Acoustic feedback correction
8126385176Communication system based on echo canceler tap profile
8136381224Method and apparatus for controlling a full-duplex communication system
8146377682Robust adaptive filter for use in acoustic and network echo cancellation
8156370245Full duplex communication circuits with bilateral T hybrid and balanced impedance configurations
8166360203System and method for dynamic voice-discriminating noise filtering in aircraft
8176354748Playing audio files at high priority
8186351532Echo canceler employing multiple step gains
8196339641Telephone device

2001

8206311071Low-feedback compact wireless telephone
8216304654Telephone handset interface with feedback control
8226301491Device and method for radio terminal with hands-free function
8236301364Tagging echoes with low frequency noise
8246301357AC-center clipper for noise and echo suppression in a communications system
8256295364Simplified communication system
8266282176Full-duplex speakerphone circuit including a supplementary echo suppressor
8276278785Echo cancelling process with improved phase control
8286269161System and method for near-end talker detection by spectrum analysis
8296266408Echo controlling apparatus of video conferencing system and control method using the same
8306263078Acoustic echo canceller with fast volume control compensation
8316256384Method and apparatus for cancelling echo originating from a mobile terminal
8326249581Spectrum-based adaptive canceller of acoustic echoes arising in hands-free audio
8336246760Subband echo cancellation method for multichannel audio teleconference and echo canceller using the same
8346240180Echo canceller employing dual-H architecture having split adaptive gain settings
8356236725Echo canceler employing multiple step gains
8366233462Portable terminal device for automatically controlling transmitting voice level and calling sound level
8376226380Method of distinguishing between echo path change and double talk conditions in an echo canceller
8386215880Two-wire conference apparatus with echo canceler without training
8396212275Telephone with automatic pause responsive, noise reduction muting and method
8406212273Full-duplex speakerphone circuit including a control interface
8416201866Echo canceler employing segment-based reinitialization
8426199036Tone detection using pitch period
8436198819Echo canceller having improved non-linear processor
8446195437Method 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
8456192126Double talk detector, method for double talk detection and device incorporating such a detector
8466185300Echo canceler for use in communications system
8476185299Adaptive echo cancellation device in a voice communication system
8486185298Telephone having a speech ban limiting function
8496181753Echo/noise canceler with delay compensation
8506178162Method and apparatus for inhibiting echo in a channel of a communication system
8516175634Adaptive noise reduction technique for multi-point communication system
8526173058Sound processing unit

2000

8536163608Methods and apparatus for providing comfort noise in communications systems
8546160886Methods and apparatus for improved echo suppression in communications systems
8556154639Handsfree unit
8566151614Adaptive filter and adapting method thereof
8576148078Methods and apparatus for controlling echo suppression in communications systems
8586147979System and method for echo cancellation in a communication system
8596141415Method and apparatus for detecting speech at a near-end of a communications system, a speaker-phone system, or the like
8606138040Method for suppressing speaker activation in a portable communication device operated in a speakerphone mode
8616137881Adaptive filtering method and apparatus employing modified fast affine projection algorithm
8626108413Echo cancellation method and echo canceller implementing such a process
8636097971Hands-free speech communication apparatus
8646091965Low-feedback compact wireless telephone
8656091937Method 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
8666091813Acoustic echo canceller
8676081732Acoustic echo elimination in a digital mobile communications system
8686069878TDM digital matrix intercom system
8696064873Method and apparatus for controlling echo on both sides of a connection
8706049606Circuit and method of double talk detection for use in handsfree telephony terminals
8716044150Method and apparatus for a host-based personal computer speakerphone
8726041290Method of adaptively adjusting the coefficients of a digital filter in an echo canceller
8736035034Double talk and echo path change detection in a telephony system
8746028929Echo canceller employing dual-H architecture having improved non-linear echo path detection

1999

8756009165Full duplex speakerphone system
8766002950Satellite communication apparatus
8776002776Directional acoustic signal processor and method therefor
8785999828Multi-user wireless telephone having dual echo cancellers
8795987143Method and apparatus for erasing acoustic echo
8805982880Method and apparatus for canceling tone signal noise generated when using a speakerphone in a digital key telephone apparatus
8815982755System and method for providing high terminal coupling loss in a handsfree terminal
8825970137Loudspeaker gain correction for a hands-free telephone terminal
8835966438Method and apparatus for adaptive volume control for a radiotelephone
8845963639Telephone having an audio response function
8855949891Filtering audio signals from a combined microphone/speaker earpiece
8865943420Power-up system for line-powered telephones
8875940499Voice switch used in hands-free communications system
8885940486Two-way communication system with selective muting
8895937060Residual echo suppression
8905937009Sub-band echo canceller using optimum wavelet packets and cross-band cancellation
8915933493Telecommunications system, a subscriber unit, and a television set comprising a subscriber unit
8925923749Method and system for eliminating acoustic echos in a digital telecommunication system
8935913062Conference system having an audio manager using local and remote audio stream state machines for providing audio control functions during a conference session
8945912923System for transmitting coded speech signals
8955911124Method and apparatus for applying echo mitigation in a communication device
8965909489Method of and circuit arrangement for improving the transmission properties of an echo affected transmission link in a telecommunications network
8975909384System for dynamically adapting the length of a filter
8985907538Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input
8995901230Hands-free communication method for a multichannel transmission system
9005896450Automatically variable circuit of sound level of received voice signal in telephone
9015894513Hands-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
9025889857Acoustical echo canceller with sub-band filtering
9035887059System and method for performing echo cancellation in a communications network employing a mixed mode LMS adaptive balance filter
9045884194Hands-free telephone
9055875246Distributed audio signal processing in a network experiencing transmission delay
9065867574Voice activity detection system and method
9075867573Telephone handset interface with feedback control
9085862388Interrupt-time processing of received signals
9095859979System for negotiating conferencing capabilities by selecting a subset of a non-unique set of conferencing capabilities to specify a unique set of conferencing capabilities
9105859914Acoustic echo canceler
9115857019Apparatus 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

9125852769Cellular telephone audio input compensation system and method
9135848151Acoustical echo canceller having an adaptive filter with passage into the frequency domain
9145848146Audio system for conferencing/presentation room
9155841856Hands-free telephone set
9165838787Method and system for controlling echo return loss using a complementary variolosses in transmit path
9175838786Intelligent acoustic systems peripheral
9185835851Method and apparatus for echo reduction in a hands-free cellular radio using added noise frames
9195828756Stereophonic acoustic echo cancellation using non-linear transformations
9205825754Filter and process for reducing noise in audio signals
9215819183Low-feedback compact wireless telephone
9225818945Subband echo cancellation method using projection algorithm
9235818928Method and circuit arrangement for detecting speech in a telephone terminal from a remote speaker
9245809237Registration of computer-based conferencing system
9255805696Echo canceller adaptation technique
9265799078Echo canceller
9275796819Echo canceller for non-linear circuits
9285796818Dynamic optimization of handsfree microphone gain
9295794018System and method for synchronizing data streams
9305793863Telephone having a speech band limiting function
9315790657Echo suppressor capable of suppressing an echo resulting from acoustic coupling without spoiling a natural sound of conversation
9325790632Method and apparatus for echo canceling accounting for companding induced quantization error
9335787165Handsfree radiotelephone having dynamic path attenuation control for echo suppression
9345774674System for negotiating at least two sets of video capabilities between two nodes to perform video conferencing between the nodes according to the selected set
9355774562Method and apparatus for dereverberation
9365774561Subband acoustic echo canceller
9375771440Communication device with dynamic echo suppression and background noise estimation
9385768364Software speakerphone system and method of operating a speakerphone
9395761318Method and apparatus for multi-channel acoustic echo cancellation
9405757905Telephone set with circuit for suppression of howling and echo
9415737409Echo removing apparatus
9425737408Echo cancelling system suitable for voice conference
9435737407Voice activity detector for half-duplex audio communication system
9445734987Noise-controlled communication apparatus
9455734715Process and device for adaptive identification and adaptive echo canceller relating thereto
9465732134Doubletalk detection by means of spectral content
9475721772Subband acoustic echo canceller
9485721771Hands-free speaking device with echo canceler
9495721730Spectral noise compensation for telecommunication signal processing
9505715310Apparatus and method for echo attenuation
9515715309Conversion of compressed speech codes between attenuated and unattenuated formats
9525708722Microphone expansion for background noise reduction
9535706344Acoustic echo cancellation in an integrated audio and telecommunication system

1997

9545699423Telephone set in which an echo signal is effectively cancelled in spite of being provided with a plurality of sound producing units
9555696821Radiotelephone and method therefor for substantially reducing audio feedback
9565696819Speech communication apparatus
9575692042Speakerphone controlled by a comparator with hysteresis
9585687229Method for controlling echo canceling in an echo canceller
9595687177Tone blocking using variable delay buffer
9605680450Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
9615675641Dual-mode speaker telephone
9625673393Managing bandwidth over a computer network having a management computer that allocates bandwidth to client computers upon request
9635668871Audio signal processor and method therefor for substantially reducing audio feedback in a cummunication unit
9645666429Energy estimator and method therefor
9655666428Audio distribution system
9665664011Echo canceller with adaptive and non-adaptive filters
9675663955Echo canceller system with shared coefficient memory
9685663951Delayed transmission of data packets over networks
9695661813Method and apparatus for multi-channel acoustic echo cancellation
9705661795Adaptive signal processing device, echo suppressing device and hand-portable telephone device
9715657384Full duplex speakerphone
9725649008Circuit and method of reducing sidetone in a receive signal path
9735646991Noise replacement system and method in an echo canceller
9745646990Efficient speakerphone anti-howling system
9755644635Method of and device for echo cancellation
9765640450Speech circuit controlling sidetone signal by background noise level
9775638439Adaptive filter and echo canceller
9785638311Filter coefficient estimation apparatus
9795636323Speech communication apparatus having an echo canceler
9805636272Apparatus amd method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones
9815633936Method and apparatus for detecting a near-end speech signal
9825631967Processing audio signals using a state variable
9835631899Acoustic echo canceler
9845625697Microphone selection process for use in a multiple microphone voice actuated switching system
9855621800Integrated circuit that performs multiple communication tasks
9865621724Echo cancelling device capable of coping with deterioration of acoustic echo condition in a short time
9875619566Voice activity detector for an echo suppressor and an echo suppressor
9885617472Noise suppression of acoustic signal in telephone set
9895615256Device and method for automatically controlling sound volume in a communication apparatus
9905612996Loop gain processing system for speakerphone applications
9915610909Multistage echo canceler including time variation compensation
9925608804Method of and apparatus for identifying a system with adaptive filter
9935608793Speech control apparatus used in a folding telephone
9945604799Switching type echo canceler
9955604793Tone blocking using variable delay buffer
9965602913Robust double-talk detection
9975600797System for identifying new client and allocating bandwidth thereto by monitoring transmission of message received periodically from client computers informing of their current status
9985600714Conference telephone using dynamic modeled line hybrid
9995598468Method and apparatus for echo removal in a communication system
10005598466Voice activity detector for half-duplex audio communication system
10015592547Processing audio signals using a discrete state machine

1996

10025590128Dial lists for computer-based conferencing systems
10035586180Method of automatic speech direction reversal and circuit configuration for implementing the method
10045579389Histogram-based processing of audio signals
10055577116Apparatus and method for echo characterization of a communication channel
10065574934Preemptive priority-based transmission of signals using virtual channels
10075570423Method of providing adaptive echo cancellation
10085566238Distributed processing of audio signals
10095561737Voice actuated switching system
10105561668Echo canceler with subband attenuation and noise injection control
10115559881Network echo canceller
10125559880Circuit for hands free talking
10135553137Method and apparatus for echo canceling in a communication system
10145553014Adaptive finite impulse response filtering method and apparatus
10155550901Full-duplex adapter for PBX telephone system
10165548642Optimization of adaptive filter tap settings for subband acoustic echo cancelers in teleconferencing
10175546458Handsfree communication apparatus
10185544242Speakerphone with event driven control circuit
10195539731Echo cancelling method and apparatus using fast projection scheme
10205535433Hands-free circuitry providing audio signal adjustment based on speaker volume value
10215528666Personal phone expansion system
10225526426System and method for an efficiently constrained frequency-domain adaptive filter
10235524110Conferencing over multiple transports
10245513265Multi-channel echo cancelling method and a device thereof
10255506954PC-based conferencing system
10265506832Remote confidence testing for computer-based conferencing system
10275502717Method and apparatus for estimating echo cancellation time
10285493568Media dependent module interface for computer-based conferencing system
10295483528TDM digital matrix intercom system

1995

10305479502Speaking apparatus having handfree conversation function
10315477534Acoustic echo canceller
10325475731Echo-canceling system and method using echo estimate to modify error signal
10335473686Echo cancellation apparatus
10345471528Voice switched speakerphone with filters having exponential transfer function in the monitoring path
10355467394Method of improving sidetone attenuation in electroacoustic systems
10365463618Echo canceller
10375459786Loudspeaker telephone device comprising a novel noise suppressing circuit
10385440644Audio distribution system having programmable zoning features
10395434912Audio processing system for point-to-point and multipoint teleconferencing
10405430796Auxiliary attenuator arrangement for use in voice-switched speakerphone and method of selectively inserting communication loss in speakerphone paths
10415428604Training method for an echo canceller for use in a voice conference system
10425428562Fast converging adaptive filter
10435416829Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes
10445414763Apparatus and method for providing echo suppression to a plurality of telephones
10455410595Apparatus and method for noise reduction for a full-duplex speakerphone or the like
10465408530Echo cancelling method and echo canceller using the same
10475404397Conference system with automatic speaker detection and speaker unit
10485400399Speech communication apparatus equipped with echo canceller
10495398281Telephone with hands-free operation
10505396554Multi-channel echo canceling method and apparatus
10515396550Radio and land-line telephones with hands-free operation
10525390250Echo canceller with improved doubletalk detection
10535390244Method and apparatus for periodic signal detection
10545387877Voltage controlled attenuator for speakerphones
10555386465Audio processing system for teleconferencing with high and low transmission delays
10565384843Hands-free telephone set
10575381475Arrangement for suppressing echoes in a digital portable telephone
10585379450Radio loudspeaker telephone device capable of automatically preventing howling on execution of calling operation

1994

10595371789Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors
10605365583Method for fail-safe operation in a speaker phone system
10615363434Audio distribution system
10625359656Adaptive echo cancellation apparatus
10635359653Circuit arrangement for controlling the volume range of a voice terminal
10645353348Double echo cancelling system
10655343521Device for processing echo, particularly acoustic echo in a telephone line
10665329587Low-delay subband adaptive filter
10675327496Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation
10685323459Multi-channel echo canceler
10695323458Echo cancellation in a full-duplex speakerphone
10705321746Adjustable gain range current mirror
10715319704Control circuit for voltage controlled attenuator for speakerphones
10725307405Network echo canceller
10735305307Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths
10745297198Two-way voice communication methods and apparatus
10755289539Echo canceller using impulse response estimating method

1993

10765272695Subband echo canceller with adjustable coefficients using a series of step sizes
10775271057Audio processing system for teleconferencing system
10785263083Method and apparatus for sharing speakerphone processor among multiple users
10795263079Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes
10805255316Hands-free telephone apparatus
10815251263Adaptive noise cancellation and speech enhancement system and apparatus therefor
10825247512Echo canceller
10835237562Echo path transition detection
10845212722Hands-free telephone having a handset volume attenuator for controlling speaker volume in a hands-free adaptor
10855202918Duplex transducer for simultaneous voice broadcast and reception
10865199065Method for automatic speech direction reversal, and circuit configuration for performing the method
10875199064Fully-integrated telephone unit
10885187741Enhanced acoustic calibration procedure for a voice switched speakerphone

1992

10895172410Conference telephone system and method
10905172408Speakerphone state-controlled alerting arrangement
10915170430Voice-switched handset receive amplifier
10925138656Intercom with transducer enclosure to attenuate resonant frequencies
10935136577Sub-band acoustic echo canceller
10945134658Apparatus for discriminating information signals from noise signals in a communication signal
10955131048Audio distribution system
10965131032Echo canceller and communication apparatus employing the same
10975125026Internal telephone intercom system
10985121426Loudspeaking telephone station including directional microphone
10995099472Hands free telecommunication apparatus and method

1991

11005075687Echo suppression with both digital and analog variable attenuators
11015058153Noise mitigation and mode switching in communications terminals such as telephones
11025054061Hands-free telephone
11035050160Training method for an echo canceller for use in a voice conference system
11045048082Voice direction recognition in a digital telephone station
11055040206Communication apparatus having driving mechanism and speaker-phone
11065033081Key telephone system
11075027393Voice conference system using echo cancellers
11085021783Method for operating an apparatus for facilitating communications
11095020098Telephone conferencing arrangement
11105016271Echo canceler-suppressor speakerphone
11115014294Speakerphone for cellular telephones with howl prevention, detection, elimination and determination
11125010570Method for active feedback suppression
11135007046Computer controlled adaptive speakerphone
11144998241Echo canceller
11154991167Voice controlled attenuation adjustment in telephone transmission circuits
11164991166Echo reduction circuit
11174989242Control device for a hand-free alternate operating telephone set
11184984265Device for forming the hands-free function in a telephone set, associating the gain switching and echo suppression functions
11194982427Integrated circuit for telephone set with signal envelope detector
11204982425Hands-free telephone

1990

11214979163Echo suppression arrangement for an adaptive speakerphone
11224965833Voice enhancer system
11234965822Full duplex speakerphone
11244959857Acoustic calibration arrangement for a voice switched speakerphone
11254956838Echo cancelling device with frequency sub-band filtering
11264955055Loudspeaking telephone with a frequency shifting circuit
11274945570Method for terminating a telephone call by voice command
11284944002Current switch for use in telephony systems or the like
11294930156Telephone receiver transmitter device
11304912758Full-duplex digital speakerphone
11314908855Electronic telephone terminal having noise suppression function
11324903247Digital echo canceller
11334901346Computer controlled speakerphone for adapting to a communication line
11344899380Loudspeaking telephone with a variable gain circuit
11354891837Voice control circuit for a communication terminal

1989

11364887288Self calibration arrangement for a voice switched speakerphone
11374885773Apparatus for mounting a unidirectional microphone in a hands-free telephone subset
11384879745Half-duplex speakerphone
11394847897Adaptive expander for telephones
11404843621Speakerphone using digitally compressed audio to detect acoustic feedback
11414835484Gain control circuit for suppressing Larsen effect in a loudspeaker telephone
11424831651Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier
11434829565Telephone with background volume control
11444819263Apparatus and method for hands free telephonic communication
11454811390Control circuit for mobile telephone with full duplex operation capability
11464796287Digital loudspeaking telephone

1988

11474764954Automatic gain control in a loudspeaker telephone set
11484756021Telephone set
11494754419Adaptive digital filter
11504748663Loudspeaking telephone instrument
11514741018Speakerphone using digitally compressed audio to control voice path gain
11524736413Method for the control of voice channel attenuation
11534731832Process and apparatus for control of a hands-free telephone set operating in alternation between sending and receiving
11544731831Telephone instrument
11554726062Duplex hands-free communications circuit
11564724540Speakerphone with fast idle mode
11574723277Loudspeaking telephone set having an anti-Larsen device for instability detection and control
11584720856Control circuit having a direct current control loop for controlling the gain of an attenuator

1987

11594715063Speakerphone for radio and landline telephones
11604715062Speakerphone control circuit having low gain states and method for controlling gain of speakerphone
11614710953Speech control in a telephone station
11624700382Voice-switched telephone circuit with center idle state
11634696032Voice switched gain system
11644691348Two way telephone communication system
11654689814External device interface for an electronic telephone
11664689506Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature
11674679228Speakerphone sensing circuit
11684677661Microprocessor controlled telephone unit
11694669108Wireless hands-free conference telephone system
11704658425Microphone actuation control system suitable for teleconference systems
11714648110Circuit arrangement for a voice-controlled hands-free telephone facility
11724644579Shunt regulator for hands-free telephone
11734636586Speakerphone with adaptive cancellation of room echoes

1986

11744629829Full duplex speakerphone for radio and landline telephones
11754608462Telephone instrument circuit
11764600815Automatic gain control for echo cancellers and similar adaptive systems
11774588859Two channel audio communication system
11784580013Handsfree communication apparatus and method
11794571461Conference telephone apparatus
11804564939Handsfree telephone

1985

11814560840Digital handsfree telephone
11824555596Loudspeaking telephones
11834555592Wireless hands-free conference telephone system
11844542263Speech control circuit
11854527014Loudspeaking telephone
11864513177Loudspeaking telephone system
11874507524Loudspeaker telephone system
11884506381Aural transmitter device
11894497980Handsfree circuit for telephone instrument
11904496799Handsfree telephone instrument using digital dial
11914493950Loudspeaker telephone
11924493101Anti-howl back device
11934492824Speakerphone linear comparator

1984

11944490582Speakerphone control circuit
11954488007Speech-amplifier telephone station
11964485272Acoustic feedback cancelling electro-acoustic transducer network
11974484034Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker
11984465902Digital space phone system
11994456792Voice switching arrangement for telephone conferencing
12004454384Hands free telephone with switchable gain in the two speech signal paths
12014453039Arrangement for avoiding annoying sustained oscillations in a closed-loop system and loud-speaking telephone set employing this arrangement
12024433435Arrangement for reducing the noise in a speech signal mixed with noise

1983

12034414432Pseudo-full duplex television/telephone loudspeaker system
12044400584Speakerphone for radio and, landline telephones
12054400581Incoming audio detection circuit for a speaker telephone
12064396802Aswixs remote speaker and handset set
12074396799Combination of a loudspeaking telephone set and a hand set for soft speaking
12084385207Line powered transformerless loudspeaking telephone
12094378603Radiotelephone with hands-free operation

1982

12104359606Voice switching control system
12114346261Speaker phones
12124330690Telephone group listening systems
12134329543Communication system
12144319086Voice switch for hands free communication apparatus
12154317959Speech control circuit
12164315103Speech-controlled loudspeaker telephone station circuit
12174309573Loudspeaking substation circuit

1981

12184304969Power circuit for loudspeaker telephone
12194293740Hands free answer intercom
12204282409Speech networks for telephone sets
12214253000Method and system for reducing conference bridge oscillations
12224251689Loudspeaker telephone apparatus
12234243837Telephone transmission installation between interlocutors in a noisy environment

1980

12244225754Loudspeaker telephone
12254215252Video teleconference audio echo control unit

1979

12264175216Intercom calling apparatus in a key telephone system
12274162374Voice-switched telephone set
12284161624Hands-free telephone with cascaded attenuators
12294156797Filter for voice operated triggering circuits
12304154981Telephone system for diver communication
12314147892Speakerphone with dynamic level discriminator

1978

12324126770Echo canceller
12334123620Apparatus for controlling the sound generation in the loudspeakers of intercommunicating telephone sets in response to speech signals from the microphones of said telephone sets
12344119797Voice operated switch having an activation level which is higher than its sustaining level
12354115658Two way telephone amplifier
12364101735Two-way loudspeaking device for telephone stations

1977

12374065646Power converter
12384057688Intercom embodying tap transducers
12394052562System for control of speech direction in duplex telephone circuits
12404051325Speech intercommunication system
12414049911Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude
12424025728Speaker telephone
12434008376Loudspeaking teleconferencing circuit
12444006310Noise-discriminating voice-switched two-way intercom system
12454002854Loudspeaking telephone instruments

1976

12463976847Key telephone system intercom arrangement
12473975588Acoustic feedback control
12483974344Electronic speech circuit for a central battery telephone set
12493970786Loudspeaking telephone with improved receive sensitivity
12503963876Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network
12513963868Loudspeaking telephone hysteresis and ambient noise control
12523953676Digital control of a loudspeaking telephone system
12533952166Loudspeaking telephone circuit
12543946170Self regulating telephone sets
12553944743Method and apparatus for feedback suppression
12563939311Muting circuit for subscribers telephone
12573932711Transmission of voice or sound through telegraphy
© 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017