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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 5796819 |
Echo canceller for non-linear circuits |
Aug. 18, 1998 |
| 5796820 |
Recovery of previous filter coefficients with smaller capacity memory |
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 |
| 5610909 |
Multistage echo canceler including time variation compensation |
Mar. 11, 1997 |
| 5572545 |
Process for starting up a modem containing a variable-phase echo canceller and modem in which such a process is implemented |
Nov. 5, 1996 |
| 5477535 |
Method of preventing a divergence of an adaptive echo canceller in a noisy signal environment |
Dec. 19, 1995 |
| 5418778 |
Local and remote echo canceling apparatus particularly adapted for use in a full duplex modem |
May. 23, 1995 |
| 5406552 |
Device and method for linear listener echo cancellation |
Apr. 11, 1995 |
| 5404397 |
Conference system with automatic speaker detection and speaker unit |
Apr. 4, 1995 |
| 5396517 |
Transversal filter useable in echo canceler, decision feedback equalizer applications for minimizing non-linear distortion in signals conveyed over full duplex two-wire communication link |
Mar. 7, 1995 |
| 5351291 |
Adaptive echo cancellation method and device for implementing said method |
Sep. 27, 1994 |
| 5343522 |
Adaptive sparse echo canceller using a sub-rate filter for active tap selection |
Aug. 30, 1994 |
| 5329587 |
Low-delay subband adaptive filter |
Jul. 12, 1994 |
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