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Class Information
Number: 370/291
Name: Multiplex communications > Duplex > Transmit/receive interaction control > Echo suppression or cancellation > Using a particular adaptive filter > Using a transversal filter
Description: Subject matter wherein the filtering apparatus is consists of one or more tapped delay lines with a summing or weighing circuit.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8659986 Crosstalk cancellation for a multiport ethernet system Feb. 25, 2014
8605891 Adaptive gain control based on echo canceller performance information Dec. 10, 2013
8559532 Method and system for detecting non-linear devices Oct. 15, 2013
8411603 Method and system for dual digital microphone processing in an audio CODEC Apr. 2, 2013
8364298 Filtering application sounds Jan. 29, 2013
8270394 Method and apparatus for reducing an interference signal in a communication system Sep. 18, 2012
8254490 Reducing transmit signal components of a receive signal of a transceiver using a shared DAC architecture Aug. 28, 2012
8190114 Frequency-dependent filtering for wireless communications transmitters May. 29, 2012
8130941 Echo canceler Mar. 6, 2012
8077642 Methods and apparatus for signal echo cancellation and transmitter calibration in full duplex systems Dec. 13, 2011
7483420 DSP circuitry for supporting multi-channel applications by selectively shifting data through registers Jan. 27, 2009
7471670 Method and apparatus for reducing echo and crosstalk in a communication system Dec. 30, 2008
7065056 Transceiver circuit including an echo canceller Jun. 20, 2006
6947395 Locating network echos Sep. 20, 2005
6744887 Acoustic echo processing system Jun. 1, 2004
6694020 Frequency domain stereophonic acoustic echo canceller utilizing non-linear transformations Feb. 17, 2004
6671374 ADAPTIVE FILTER FOR ECHO CANCELLATION, METHOD FOR OPERATING AN ADAPTIVE FILTER FOR ECHO CANCELLATION, AN ARTICLE OF MANUFACTURE FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER Dec. 30, 2003
6661895 Zero-delay structure for sub-band echo cancellation Dec. 9, 2003
6498850 Multichannel echo canceller with a compander Dec. 24, 2002
6452967 Method and device for reducing coupling effects between neighboring telephone devices Sep. 17, 2002
6426979 Adaptation control algorithm for echo cancellation using signal-value based analysis Jul. 30, 2002
6404809 Method and apparatus for training equalizer structures in a digital communication system having periodic digital impairments Jun. 11, 2002
6381272 Multi-channel adaptive filtering Apr. 30, 2002
6256383 IIR filter of adaptive balance circuit for long tail echo cancellation Jul. 3, 2001
6246444 Digital and analog TV common-use receiver having single ghost canceler and ghost cancellation method Jun. 12, 2001
6219334 Receiving apparatus for receiving orthogonal frequency division multiplexing signal and receiving method thereof Apr. 17, 2001
6181794 Echo canceler and method thereof Jan. 30, 2001
6130943 Method and apparatus for suppressing echo in telephony Oct. 10, 2000
6028929 Echo canceller employing dual-H architecture having improved non-linear echo path detection Feb. 22, 2000
6009083 Cascade echo canceler arrangement Dec. 28, 1999
5940455 Adaptive filter with disabling circuit for fast tap weight convergence Aug. 17, 1999
5923708 Decoding circuit for a read signal from a magnetic recording and reading system using partial response Jul. 13, 1999
5920548 Echo path delay estimation Jul. 6, 1999
5912966 Enhanced echo canceller for digital cellular application Jun. 15, 1999
5889857 Acoustical echo canceller with sub-band filtering Mar. 30, 1999
5831880 Method for processing a signal in a CSD filter and a circuit therefor Nov. 3, 1998
5818945 Subband echo cancellation method using projection algorithm Oct. 6, 1998
5815496 Cascade echo canceler arrangement Sep. 29, 1998
5809058 Code division multiple access signal receiving apparatus for base station Sep. 15, 1998
5796820 Recovery of previous filter coefficients with smaller capacity memory Aug. 18, 1998
5796819 Echo canceller for non-linear circuits Aug. 18, 1998
5764753 Half-duplex controller Jun. 9, 1998
5752229 Intelligent near-end speech detection May. 12, 1998
5745549 Line break detection device and modem comprising such a device Apr. 28, 1998
5737410 Method for determining the location of echo in an echo canceller Apr. 7, 1998
5691978 Self-cancelling full-duplex RF communication system Nov. 25, 1997
5663955 Echo canceller system with shared coefficient memory Sep. 2, 1997
5649012 Method for synthesizing an echo path in an echo canceller Jul. 15, 1997
5644596 Method and apparatus for frequency selective adaptive filtering Jul. 1, 1997
5631899 Acoustic echo canceler May. 20, 1997

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