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Class Information
Number: 379/406.01
Name: Telephonic communications > Echo cancellation or suppression
Description: Subject matter including circuitry to prevent undesired reflection, oscillation, feedback, or signal transmission.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7613291 |
Echo path change detection using dual sparse filtering |
Nov. 3, 2009 |
| 7596220 |
Echo cancellation using adaptive IIR and FIR filters |
Sep. 29, 2009 |
| 7590077 |
Canceller device and data transmission system |
Sep. 15, 2009 |
| 7583768 |
Apparatus for canceling intersymbol interference in semiconductor memory device and method thereof |
Sep. 1, 2009 |
| 7583613 |
Method of monitoring the quality of a realtime communication |
Sep. 1, 2009 |
| 7573943 |
Interference cancellation system |
Aug. 11, 2009 |
| 7558729 |
Music detection for enhancing echo cancellation and speech coding |
Jul. 7, 2009 |
| 7554933 |
Echo cancellation device for full duplex communication systems |
Jun. 30, 2009 |
| 7552050 |
Speech recognition system and method utilizing adaptive cancellation for talk-back voice |
Jun. 23, 2009 |
| 7548599 |
Method and apparatus for reducing cross-talk with reduced redundancies |
Jun. 16, 2009 |
| 7542577 |
Input sound processor |
Jun. 2, 2009 |
| 7532717 |
Echo canceler with automatic gain control of echo cancellation signal |
May. 12, 2009 |
| 7529176 |
Method and apparatus for determining a transmit PSD at a remote location |
May. 5, 2009 |
| 7525952 |
Method and apparatus for determining the source of user-perceived voice quality degradation in a network telephony environment |
Apr. 28, 2009 |
| 7515704 |
Method, apparatus and articles incorporating a step size control technique for echo signal cancellation |
Apr. 7, 2009 |
| 7515703 |
Method and system for determining conference call embellishment tones and transmission of same |
Apr. 7, 2009 |
| 7516033 |
Method and apparatus for identifying echo sources in a communication path |
Apr. 7, 2009 |
| 7508948 |
Reverberation removal |
Mar. 24, 2009 |
| 7480377 |
Dual adaptive filter apparatus and method |
Jan. 20, 2009 |
| 7471788 |
Echo cancellers for sparse channels |
Dec. 30, 2008 |
| 7466746 |
Single amplifier presale processing circuitry |
Dec. 16, 2008 |
| 7454011 |
ADSL communication system having echo canceller and method for downloading filter coefficient of the echo canceller |
Nov. 18, 2008 |
| 7450713 |
Echo canceller employing dual-H architecture having improved non-linear echo path detection |
Nov. 11, 2008 |
| 7436787 |
Transceiver for full duplex communication systems |
Oct. 14, 2008 |
| 7433463 |
Echo cancellation and noise reduction method |
Oct. 7, 2008 |
| 7428304 |
Method and apparatus for detecting subscriber alerting signal tones and customer premises equipment alerting signal tones to non-echo canceling modems |
Sep. 23, 2008 |
| 7424109 |
Rapid training echo cancellor for telecommunications system |
Sep. 9, 2008 |
| 7420937 |
Selectively adaptable far-end echo cancellation in a packet voice system |
Sep. 2, 2008 |
| 7408891 |
Echo canceller employing H-register and storage register |
Aug. 5, 2008 |
| 7403610 |
Echo canceller employing dual-H architecture having split adaptive gain settings |
Jul. 22, 2008 |
| 7403609 |
Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus |
Jul. 22, 2008 |
| 7391877 |
Spatial processor for enhanced performance in multi-talker speech displays |
Jun. 24, 2008 |
| 7386120 |
Echo canceller having a frequency domain active region location estimator |
Jun. 10, 2008 |
| 7366118 |
Echo cancellation |
Apr. 29, 2008 |
| 7362719 |
Method and apparatus for cross-talk cancellation in frequency division multiplexed transmission systems |
Apr. 22, 2008 |
| 7359504 |
Method and apparatus for reducing echo and noise |
Apr. 15, 2008 |
| 7355989 |
Echo canceling method and device for multiplex line |
Apr. 8, 2008 |
| 7349482 |
Echo canceller of ADSL system and training method thereof |
Mar. 25, 2008 |
| 7349353 |
Techniques to reduce echo |
Mar. 25, 2008 |
| 7346013 |
Frequency domain equalization of communication signals |
Mar. 18, 2008 |
| 7333448 |
Full duplex transceiver |
Feb. 19, 2008 |
| 7333447 |
Packet voice system with far-end echo cancellation |
Feb. 19, 2008 |
| 7330738 |
Apparatus and method for canceling residual echo in a mobile terminal of a mobile communication system |
Feb. 12, 2008 |
| 7330500 |
Adjustable electronic duplexer |
Feb. 12, 2008 |
| 7324466 |
Echo canceling system and echo canceling method |
Jan. 29, 2008 |
| 7315592 |
Common mode noise cancellation |
Jan. 1, 2008 |
| 7313233 |
Tone clamping and replacement |
Dec. 25, 2007 |
| 7307965 |
Echo cancellation device for full duplex communication systems |
Dec. 11, 2007 |
| 7304961 |
Echo cancellation device for full duplex communication systems |
Dec. 4, 2007 |
| 7298711 |
Echo cancellation in a communication device |
Nov. 20, 2007 |
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