| |
 |
|
Class Information
Number: 370/288
Name: Multiplex communications > Duplex > Transmit/receive interaction control > Echo suppression or cancellation > Using an attenuator
Description: Subject matter wherein a device is used to reduce the magnitude of the reflected communication signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7263074 |
Voice activity detection based on far-end and near-end statistics |
Aug. 28, 2007 |
| 7212502 |
Method and apparatus for dynamically adapting telephony analog loss based on channel content |
May. 1, 2007 |
| 7154867 |
Echo reduction |
Dec. 26, 2006 |
| 7065466 |
Attenuator test system |
Jun. 20, 2006 |
| 6956830 |
Line echo cancellation system |
Oct. 18, 2005 |
| 6947773 |
Method and apparatus for reducing echo feedback in a communication system |
Sep. 20, 2005 |
| 6947395 |
Locating network echos |
Sep. 20, 2005 |
| 6922403 |
Acoustic echo control system and double talk control method thereof |
Jul. 26, 2005 |
| 6865163 |
Data transmission methods with payload unit numbering in a telecommunication system |
Mar. 8, 2005 |
| 6744885 |
ASR talkoff suppressor |
Jun. 1, 2004 |
| 6741874 |
Method and apparatus for reducing echo feedback in a communication system |
May. 25, 2004 |
| 6614766 |
Interference canceller |
Sep. 2, 2003 |
| 6542477 |
Digitally-tunable echo-cancelling analog front end for wireline communications devices |
Apr. 1, 2003 |
| 6201796 |
Startup protocol for high throughput communications systems |
Mar. 13, 2001 |
| RE36934 |
Control device for a hands-free telephone set |
Oct. 31, 2000 |
| 6125138 |
Base station transmitter-receiver |
Sep. 26, 2000 |
| 6108412 |
Adaptive echo cancelling system for telephony applications |
Aug. 22, 2000 |
| 5875246 |
Distributed audio signal processing in a network experiencing transmission delay |
Feb. 23, 1999 |
| 5721730 |
Spectral noise compensation for telecommunication signal processing |
Feb. 24, 1998 |
| 5668794 |
Variable gain echo suppressor |
Sep. 16, 1997 |
| 5636323 |
Speech communication apparatus having an echo canceler |
Jun. 3, 1997 |
| 5561668 |
Echo canceler with subband attenuation and noise injection control |
Oct. 1, 1996 |
| 5396488 |
Method for non-linear signal processing in an echo canceller |
Mar. 7, 1995 |
| 5373288 |
Initializing terminals in a signal distribution system |
Dec. 13, 1994 |
| 5363441 |
Technique for reducing echoes in conference communications |
Nov. 8, 1994 |
| 5353348 |
Double echo cancelling system |
Oct. 4, 1994 |
| 5313498 |
Method and arrangement of echo elimination in digital telecommunications system |
May. 17, 1994 |
| 5305307 |
Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths |
Apr. 19, 1994 |
| 5283784 |
Echo canceller processing techniques and processing |
Feb. 1, 1994 |
| 5263019 |
Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone |
Nov. 16, 1993 |
| 5204854 |
Adaptive hybrid |
Apr. 20, 1993 |
| 5187741 |
Enhanced acoustic calibration procedure for a voice switched speakerphone |
Feb. 16, 1993 |
| 5157653 |
Residual echo elimination with proportionate noise injection |
Oct. 20, 1992 |
| 5075687 |
Echo suppression with both digital and analog variable attenuators |
Dec. 24, 1991 |
| 4998241 |
Echo canceller |
Mar. 5, 1991 |
| 4991166 |
Echo reduction circuit |
Feb. 5, 1991 |
| 4991167 |
Voice controlled attenuation adjustment in telephone transmission circuits |
Feb. 5, 1991 |
| 4989243 |
Automatic compensation system of transmission level in MODEM |
Jan. 29, 1991 |
| 4989242 |
Control device for a hand-free alternate operating telephone set |
Jan. 29, 1991 |
| 4979163 |
Echo suppression arrangement for an adaptive speakerphone |
Dec. 18, 1990 |
| 4969145 |
Modem |
Nov. 6, 1990 |
| 4864608 |
Echo suppressor |
Sep. 5, 1989 |
| 4794591 |
Digital voice switch for a multi-port conference circuit |
Dec. 27, 1988 |
| 4741025 |
Speech additive distribution equipment for conferencing system |
Apr. 26, 1988 |
| 4713803 |
Bidirectional digital transmission system with echo-cancellation |
Dec. 15, 1987 |
| 4605822 |
Active equalization circuit |
Aug. 12, 1986 |
| 4591670 |
Echo canceller and echo suppressor for frequency divisional attenuation of acoustic echoes |
May. 27, 1986 |
| 4564939 |
Handsfree telephone |
Jan. 14, 1986 |
| 4562571 |
Speech processing device for radioelectric equipment adapted for speech transmission and reception |
Dec. 31, 1985 |
| 4560836 |
Four-wire communication line circuit and conference network comprising such circuits |
Dec. 24, 1985 |
|
|
|
