СПИСОК патентов США - подгруппа МПК16 H04Q1/457
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| № п/п | Номер патента | Название патента | |||
2016 | |||||
| 1 | 9479846 | Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope | |||
2015 | |||||
| 2 | 9204206 | Method and apparatus for transmitting signaling | |||
| 3 | 9185471 | Method and apparatus for detecting one or more predetermined tones transmitted over a communication network | |||
| 4 | 9148520 | Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope | |||
2005 | |||||
| 5 | 6850616 | Frequency error detection methods and systems using the same | |||
2004 | |||||
| 6 | 6813529 | Method and apparatus for signal frequency decoding without an analog bandpass filter | |||
| 7 | 6801622 | Devices, software and methods for passing DTMF signals under voice compression | |||
| 8 | 6748059 | Apparatus and method for unified tone detection | |||
| 9 | 6683944 | Voice transmitter | |||
2003 | |||||
| 10 | 6668057 | Apparatus for receiving tone signal, apparatus for transmitting tone signal, and apparatus for transmitting or receiving tone signal | |||
| 11 | 6650662 | Method and system for transmitting a DTMF signal with compressed voice in a packet switching network | |||
| 12 | 6608896 | Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete Fourier transform | |||
| 13 | 6590972 | DTMF detection based on LPC coefficients | |||
| 14 | 6580792 | Signal detector with automatic gain control | |||
| 15 | 6560331 | System and method for precise DTMF signal detection | |||
2002 | |||||
| 16 | 6370244 | Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform | |||
2000 | |||||
| 17 | 6046977 | Method and apparatus for detecting signal misalignment | |||
| 18 | 6035179 | Transmission of voice-frequency signals in a mobile telephone system | |||
| 19 | 6021192 | Tone detector | |||
1999 | |||||
| 20 | 5995557 | Tone detection with aliasing bandpass filters | |||
| 21 | 5978676 | Inband signal converter, and associated method, for a digital communication system | |||
| 22 | 5937059 | DTMF detector for detecting DTMF signals using a digital signal processing chip and method thereof | |||
1998 | |||||
| 23 | 5809133 | DTMF detector system and method which performs frequency domain energy calculations with improved performance | |||
| 24 | 5765125 | Detection of tones while minimizing incorrect identification of other sounds as tones | |||
| 25 | 5748637 | DTMF signaling on four-wire switched 56 KBPS lines | |||
1997 | |||||
| 26 | 5694466 | DTMF detector system and method which performs improved twist computation and thresholding | |||
| 27 | 5687177 | Tone blocking using variable delay buffer | |||
| 28 | 5666357 | DTMF tone passer in a voice communication system | |||
| 29 | 5659606 | Programmable modular apparatus and method for processing digital signals and detecting telephone tones | |||
| 30 | 5644634 | System and method for dual tone multifrequency detection using variable frame widths | |||
| 31 | 5633862 | DTMF signal transmission method in single frequency simultaneous transmitting and receiving system and single frequency simultaneous transmitting and receiving system transceiver capable of transmitting DTMF signal | |||
| 32 | 5604793 | Tone blocking using variable delay buffer | |||
1996 | |||||
| 33 | 5588053 | DTMF detector system and method which performs static and dynamic thresholding | |||
| 34 | 5563942 | Digital call progress tone detection method with programmable digital call progress tone detector | |||
| 35 | 5535271 | Apparatus and method for dual tone multifrequency signal detection | |||
| 36 | 5495526 | Tone-detection method for detecting at least one tone in a dual-tone multifrequency signal, call-progress method using the same | |||
1995 | |||||
| 37 | 5479498 | Digital line card having universal port for upgrading electronic messaging system | |||
| 38 | 5459784 | Dual-tone multifrequency (DTMF) signalling transparency for low-data-rate vocoders | |||
| 39 | 5457690 | DTMF Signaling on four-wire switched 56 Kbps Lines | |||
| 40 | 5442696 | Method and apparatus for detecting control signals | |||
| 41 | 5392348 | DTMF detection having sample rate decimation and adaptive tone detection | |||
1994 | |||||
| 42 | 5353346 | Multi-frequency signal detector and classifier | |||
| 43 | 5353345 | Method and apparatus for DTMF detection | |||
| 44 | 5353344 | Method of determining levels at given frequencies of a VF signal | |||
| 45 | 5343414 | Apparatus for adaptively tuning to a received periodic signal | |||
| 46 | 5339251 | Apparatus for adaptively tuning to a received periodic signal | |||
| 47 | 5333191 | Detection of multifrequency tone signals | |||
| 48 | 5325427 | Apparatus and robust method for detecting tones | |||
| 49 | 5311589 | Apparatus and method for audible signaling tone recognition | |||
1993 | |||||
| 50 | 5265097 | Data processor | |||
| 51 | 5257309 | Dual tone multifrequency signal detection and identification methods and apparatus | |||
| 52 | 5198992 | Method and apparatus for improving wideband detection of a tone | |||
| 53 | 5177785 | Method and system for secure telecommunications | |||
1992 | |||||
| 54 | 5163050 | Configurable parameter DTMF detector | |||
| 55 | 5144626 | Data processor | |||
| 56 | 5140590 | Telephone or data switching system with variable protocol inter-office communication | |||
| 57 | 5138569 | Dual tone multi-frequency detector | |||
| 58 | 5127004 | Tone and announcement message code generator for a telephonic switching system and method | |||
| 59 | 5119322 | Digital DTMF tone detector | |||
1991 | |||||
| 60 | 5073941 | Multifrequency detection | |||
| 61 | 5047764 | Paging system with dynamically programmable reception frequencies | |||
1990 | |||||
| 62 | 4979171 | Announcement and tone code generator for telephonic network and method | |||
| 63 | 4972466 | Digital composite tone alerting | |||
| 64 | 4908825 | Memory organization and output sequencer for a signal processor | |||
1989 | |||||
| 65 | 4881073 | Paging system with dynamically programmable reception frequencies | |||
| 66 | 4878051 | Paging system with commands for changing functionality of a paging receiver | |||
| 67 | 4876538 | Paging system sublocal switch | |||
| 68 | 4868558 | Paging system lata switch | |||
| 69 | 4853958 | LPC-based DTMF receiver for secondary signalling | |||
| 70 | 4839842 | Digital tone detection and generation | |||
1988 | |||||
| 71 | 4782523 | Tone detection process and device for implementing said process | |||
| 72 | 4747131 | Dial tone detector | |||
| 73 | 4737720 | DTMF generation using pre-summed tables | |||
| 74 | 4718057 | Streamlined digital signal processor | |||
1987 | |||||
| 75 | 4709344 | Programmable multifrequency digital tone receiver | |||
| 76 | 4701948 | Communication system having separate unidirectional information signalling | |||
| 77 | 4696031 | Signal detection and discrimination using waveform peak factor | |||
| 78 | 4694482 | Digital tone detector | |||
| 79 | 4689760 | Digital tone decoder and method of decoding tones using linear prediction coding | |||
| 80 | 4686490 | Digital data modulator and digital-to-analog converter | |||
| 81 | 4679001 | Adaptive stop-notch filter | |||
| 82 | 4669114 | Digital tone detector | |||
| 83 | 4644476 | Dialing tone generation | |||
| 84 | 4644345 | Interleaved dual bank encoder | |||
1986 | |||||
| 85 | 4617427 | Square root circuit | |||
| 86 | 4614909 | Apparatus for identifying digital multi-frequency signals | |||
| 87 | 4611325 | DTMF receiver sense and control arrangement | |||
| 88 | 4604713 | Tone detector and multifrequency receiver using said detector | |||
| 89 | 4602131 | Touch tone decoder | |||
| 90 | 4599700 | Process and device for digital frequency generation | |||
| 91 | 4571723 | Pulse code modulated digital telephony tone generator | |||
| 92 | 4570260 | Digital tone signal generator for telephony system | |||
| 93 | 4570235 | Digital receiver of multifrequency signals with frequency recognition device | |||
1985 | |||||
| 94 | 4541088 | Tone generation circuit for automatic PCM-TDM telecommunication exchange | |||
| 95 | 4535454 | Multifrequency tone distribution using a conferencing arrangement | |||
| 96 | 4510601 | Digital frequency receiver | |||
| 97 | 4498171 | Tone source for telephone systems | |||
1984 | |||||
| 98 | 4484035 | Dual tone multi frequency digital detector | |||
| 99 | 4479229 | Arrangement for and method of detecting multi-frequency sound code signals | |||
| 100 | 4479188 | Digital detector for a multi-frequency code in an analog signal | |||
| 101 | 4467277 | Programmable detector for tone signals | |||
| 102 | 4460808 | Adaptive signal receiving method and apparatus | |||
| 103 | 4460806 | Dual tone multifrequency and dial pulse receiver | |||
1983 | |||||
| 104 | 4403298 | Adaptive techniques for automatic frequency determination and measurement | |||
| 105 | 4399536 | Convolution filter arrangement for digital multifrequency receiver | |||
| 106 | 4399535 | Digital tone generator | |||
| 107 | 4395595 | Digital pushbutton signalling receiver | |||
| 108 | 4393496 | Method for feeding call progress tones into conference connections | |||
| 109 | 4392206 | Printer | |||
| 110 | 4390983 | Digital frequency sender | |||
| 111 | 4385385 | Circuit for monitoring a digital signal generator | |||
| 112 | 4379347 | Receiver for PCM-encoded multifrequency dialing signals | |||
1982 | |||||
| 113 | 4366348 | Method and apparatus for decoding and processing the informational content of multi-frequency signals | |||
| 114 | 4363100 | Detection of tones in sampled signals | |||
| 115 | 4361875 | Multiple tone detector and locator | |||
| 116 | 4355405 | Digital signalling system | |||
| 117 | 4354248 | Programmable multifrequency tone receiver | |||
| 118 | 4347408 | Multi-frequency signal receiver | |||
| 119 | 4334273 | Signal processing system using a digital technique | |||
| 120 | 4328398 | Digital multi-frequency receiver | |||
| 121 | 4319334 | Frequency sensing device for reducing non-periodic components | |||
1981 | |||||
| 122 | 4286326 | Digital devices for spectrum analysis | |||
| 123 | 4279017 | Method and device for detecting the presence of one or more pulse code modulated multi-frequency code signals | |||
| 124 | 4255623 | Apparatus for pulse train measurement | |||
| 125 | 4245325 | Digital multifrequency signalling receiver | |||
1980 | |||||
| 126 | 4230908 | Telephone summing circuit | |||
| 127 | 4227248 | PCM Tone signal generator | |||
| 128 | 4223185 | Multifrequency digital signal receiver | |||
| 129 | 4216463 | Programmable digital tone detector | |||
| 130 | 4211897 | Multifrequency signal receiving system | |||
| 131 | 4205203 | Methods and apparatus for digitally signaling sounds and tones in a PCM multiplex system | |||
| 132 | 4203008 | Digital signalling receiver for receiving PCM tones | |||
| 133 | 4191862 | Dual frequency tone decoder | |||
| 134 | 4187403 | Voice-protected, frequency-selective signal receiver | |||
| 135 | 4185172 | Method of and means for detecting digitized multi frequency-coded signals | |||
1979 | |||||
| 136 | 4176286 | Signal translator with squelch | |||
| 137 | 4145576 | DTMF and rotary dial signal receiver | |||
| 138 | 4133979 | Multifrequency sender/receiver in a multi-time slot digital data stream | |||
1978 | |||||
| 139 | 4124898 | Programmable clock | |||
| 140 | 4119808 | Multi-frequency receiver circuits | |||
| 141 | 4109109 | Method and apparatus for detecting the presence of signal components of predetermined frequency in multifrequency PCM signal | |||
| 142 | 4080516 | Multi-frequency signal receiver | |||
| 143 | 4076965 | Universal receiver/sender | |||
| 144 | 4070631 | Digital noise blanking circuit | |||
| 145 | 4068309 | Method and device for detecting two different frequency amplitude and phase signals in a combined digital signal | |||
| 146 | 4066846 | Combined rotary dial and touch-tone telephone decoding system | |||
1977 | |||||
| 147 | 4061885 | Digital tone decoder | |||
| 148 | 4060797 | Serial digital bit stream code detector | |||
| 149 | 4045620 | Digital tone detector | |||
| 150 | 4044206 | Digital decoder for multiple frequency telephone signalling | |||
| 151 | 4042790 | Voice guard circuit for a tone receiver | |||
| 152 | 4042789 | Tone combination detector and coincidence timer circuit | |||
| 153 | 4042788 | Tone detector | |||
| 154 | 4042787 | Output processing and output coupling circuit for a digital tone receiver | |||
| 155 | 4041248 | Tone detection synchronizer | |||
| 156 | 4028501 | Method and apparatus for translating multiple frequency signalling | |||
| 157 | 4025730 | In-band signal receiver | |||
| 158 | 4021620 | Multifrequency signal receiver with digital tone receiver | |||
| 159 | 4018991 | Multifrequency signal parity detector | |||
| 160 | 4016371 | Frequency tone detection | |||
| 161 | 4016370 | Digital tone decoder | |||
| 162 | 4009353 | Analog signal detection | |||
| 163 | 4001521 | Signal identification system | |||
1976 | |||||
| 164 | 3997727 | Time division multiplexed digital switching apparatus | |||
| 165 | 3988687 | Step-servoed tone detector | |||
| 166 | 3986112 | Novel technique for frequency detection utilizing switching filters | |||
| 167 | 3985966 | Method and apparatus for generating digital dual frequency signals | |||
| 168 | 3985965 | Digital signal generator | |||
| 169 | 3976843 | MFC receiver digital signal processing | |||
| 170 | 3971897 | Circuit arrangement for a selective signal receiver, particularly for use in telephone systems | |||
| 171 | 3965457 | Digital control processor | |||
| 172 | 3962541 | Frequency sample-and-hold circuit | |||
| 173 | 3961167 | PCM tone receiver using optimum statistical technique | |||
| 174 | 3959603 | Dual tone multiple frequency receiver/decoder | |||
| 175 | 3949177 | Method for frequency-recognition in selective signal receivers for use in telecommunication, particularly telephone systems | |||
| 176 | 3937899 | Tone detector using spectrum parameter estimation | |||
| 177 | 3936801 | Multifrequency signal receiver timing circuit | |||
| 178 | 3936611 | Time compression scanner | |||
| 179 | 3935395 | Selective signal receiver for use in telecommunication systems | |||
| 180 | 3934097 | Multifrequency tone detection | |||
| 181 | 3932708 | Frequency-selective signal receiver for communication equipments, more particularly telephone equipments | |||
| 182 | 3931480 | Time compression receiver | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||