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Browse by Category: Main > Communications
Class Information
Number: 379/406.07
Name: Telephonic communications > Echo cancellation or suppression > Using digital signal processing > Using attenuator
Description: Subject matter in which amplitude is controlled either by hardware or software according to the value of a number represented in binary form.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8675883 Apparatus and associated methodology for suppressing an acoustic echo Mar. 18, 2014
8553823 Method for identifying signals of the same origin Oct. 8, 2013
8428247 Echo mitigation in a conference call Apr. 23, 2013
8422663 Structure and method for echo reduction without loss of information Apr. 16, 2013
8411846 Echo path change detection in telecommunications networks Apr. 2, 2013
8385557 Multichannel acoustic echo reduction Feb. 26, 2013
8275142 Acoustic echo cancellation system Sep. 25, 2012
8229107 Echo canceler Jul. 24, 2012
8189766 System and method for blind subband acoustic echo cancellation postfiltering May. 29, 2012
8160240 Echo cancellation balance using noise generator and average power detection Apr. 17, 2012
8094809 Frame-based level feedback calibration system for sample-based predictive clipping Jan. 10, 2012
8090078 Systems and methods for half-duplex speakerphones and other two-way communication devices Jan. 3, 2012
8031863 Apparatus and method for controlling acoustic echo cancellation in mobile communication terminal Oct. 4, 2011
8027462 Structure and method for conversation like rendering for echo reduction without loss of information Sep. 27, 2011
7894598 System for limiting receive audio Feb. 22, 2011
7876718 Echo reduction Jan. 25, 2011
7860235 Echo suppressor Dec. 28, 2010
7809129 Acoustic echo cancellation based on noise environment Oct. 5, 2010
RE41445 Arrangement for suppressing an interfering component of an input signal Jul. 20, 2010
7734036 Dynamic attenuation method and apparatus for optimizing voice quality using echo cancellers Jun. 8, 2010
7693276 Method of measuring distortion and determining residue-echo threshold in loop start trunk circuits Apr. 6, 2010
7636435 Device and method for processing audio signals and telecommunication set equipped with such a processing device Dec. 22, 2009
7555117 Path change detector for echo cancellation Jun. 30, 2009
7532717 Echo canceler with automatic gain control of echo cancellation signal May. 12, 2009
7480377 Dual adaptive filter apparatus and method Jan. 20, 2009
7305083 Echo canceller Dec. 4, 2007
7260213 Telephone echo canceller Aug. 21, 2007
7242762 Monitoring and control of an adaptive filter in a communication system Jul. 10, 2007
7212628 Echo cancellation/suppression and double-talk detection in communication paths May. 1, 2007
7206561 Radio equipment Apr. 17, 2007
7154867 Echo reduction Dec. 26, 2006
7130413 Microprocessor-controlled full-duplex speakerphone using automatic gain control Oct. 31, 2006
7065207 Controlling attenuation during echo suppression Jun. 20, 2006
7050576 Double talk, NLP and comfort noise May. 23, 2006
7039181 Consolidated voice activity detection and noise estimation May. 2, 2006
7027591 Integrated noise cancellation and residual echo suppression Apr. 11, 2006
6978009 Microprocessor-controlled full-duplex speakerphone using automatic gain control Dec. 20, 2005
6961422 Gain control method for acoustic echo cancellation and suppression Nov. 1, 2005
6947553 Communication system for controlling training of echo canceller and line switching system Sep. 20, 2005
6947550 Acoustic echo cancellation Sep. 20, 2005
6944290 Echo cancellation through auxiliary-vector filtering Sep. 13, 2005
6925177 Echo canceler compensating for amplifier saturation and echo amplification Aug. 2, 2005
6922403 Acoustic echo control system and double talk control method thereof Jul. 26, 2005
6901141 Echo canceller May. 31, 2005
6901143 Voice switching system capable of improving a quality of conversation May. 31, 2005
6889066 Network echo suppression in mobile stations May. 3, 2005
6839427 Method and apparatus for echo canceller automatic gain control Jan. 4, 2005
6816591 Voice switching system and voice switching method Nov. 9, 2004
6798881 Noise reduction circuit for telephones Sep. 28, 2004
6757384 Robust double-talk detection and recovery in a system for echo cancelation Jun. 29, 2004

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