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Class Information
Number: 379/406.16
Name: Telephonic communications > Echo cancellation or suppression > Having analog variolosser or attenuator
Description: Subject matter in which the echo cancellation or suppression is effected primarily or solely by use of analog amplitude control in one of the primary signal paths.

Patents under this class:

Patent Number Title Of Patent Date Issued
8675883 Apparatus and associated methodology for suppressing an acoustic echo Mar. 18, 2014
8605891 Adaptive gain control based on echo canceller performance information Dec. 10, 2013
8428247 Echo mitigation in a conference call Apr. 23, 2013
8364298 Filtering application sounds Jan. 29, 2013
8335330 Methods and devices for audio upmixing Dec. 18, 2012
8260220 Communication device with reduced noise speech coding Sep. 4, 2012
8238548 Controlling echo during double-talk in a voice conference Aug. 7, 2012
8111833 Method of reducing residual acoustic echo after echo suppression in a "hands free" device Feb. 7, 2012
8094809 Frame-based level feedback calibration system for sample-based predictive clipping Jan. 10, 2012
7970124 Adaptive gain control based on echo canceller performance information Jun. 28, 2011
7734036 Dynamic attenuation method and apparatus for optimizing voice quality using echo cancellers Jun. 8, 2010
7664646 Voice activity detection and silence suppression in a packet network Feb. 16, 2010
7480377 Dual adaptive filter apparatus and method Jan. 20, 2009
7151828 Circuit arrangement for the analogue suppression of echoes Dec. 19, 2006
7039181 Consolidated voice activity detection and noise estimation May. 2, 2006
6944290 Echo cancellation through auxiliary-vector filtering Sep. 13, 2005
6904146 Full duplex echo cancelling circuit Jun. 7, 2005
6901141 Echo canceller May. 31, 2005
6816591 Voice switching system and voice switching method Nov. 9, 2004
6799062 Full-duplex hands-free transparency circuit and method therefor Sep. 28, 2004
6757384 Robust double-talk detection and recovery in a system for echo cancelation Jun. 29, 2004
6744884 Speaker-phone system change and double-talk detection Jun. 1, 2004
6618479 Echo canceler Sep. 9, 2003
6594360 Circuit configuration for two-wire/four-wire conversion Jul. 15, 2003
6580794 Acoustic echo canceler with a peak impulse response detector Jun. 17, 2003
6522746 Synchronization of voice boundaries and their use by echo cancellers in a voice processing system Feb. 18, 2003
6496581 Coupled acoustic echo cancellation system Dec. 17, 2002
6487178 Methods and apparatus for providing volume control in communicating systems including a linear echo canceler Nov. 26, 2002
6483914 Telephone filter arrangement Nov. 19, 2002
6473507 Apparatus and method for isolating transients associated with a digital subscriber line Oct. 29, 2002
6459790 System and method for selective filter isolation Oct. 1, 2002
6249581 Spectrum-based adaptive canceller of acoustic echoes arising in hands-free audio Jun. 19, 2001
6236726 Transmit power scaling for far-end crosstalk reduction May. 22, 2001
6002776 Directional acoustic signal processor and method therefor Dec. 14, 1999
5943392 Device for measuring echo return loss in a two-two wire line system Aug. 24, 1999
5548636 Method and apparatus for providing user controlled call management services Aug. 20, 1996
5548638 Audio teleconferencing apparatus Aug. 20, 1996
5544242 Speakerphone with event driven control circuit Aug. 6, 1996
5414763 Apparatus and method for providing echo suppression to a plurality of telephones May. 9, 1995
5212722 Hands-free telephone having a handset volume attenuator for controlling speaker volume in a hands-free adaptor May. 18, 1993
5016271 Echo canceler-suppressor speakerphone May. 14, 1991
4700382 Voice-switched telephone circuit with center idle state Oct. 13, 1987
4292473 Loop supervision circuit Sep. 29, 1981
4165449 Echo suppressor circuit Aug. 21, 1979
4053870 Digital signal level comparison device Oct. 11, 1977

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