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Class Information
Number: 379/406.05
Name: Telephonic communications > Echo cancellation or suppression > Residual echo cancellation
Description: Subject matter including means to cancel echo which remains at the output of a first or primary echo canceler.

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8705760 Active noise control device Apr. 22, 2014
8675883 Apparatus and associated methodology for suppressing an acoustic echo Mar. 18, 2014
8638836 Transmitter signal injection compensation Jan. 28, 2014
8620232 Post filter for spectral domain echo cancellers to handle non-linear echo components Dec. 31, 2013
8605891 Adaptive gain control based on echo canceller performance information Dec. 10, 2013
8600037 Audio quality and double talk preservation in echo control for voice communications Dec. 3, 2013
8582754 Method and system for echo cancellation in presence of streamed audio Nov. 12, 2013
8526599 Input/output apparatus and communication terminal Sep. 3, 2013
8498423 Device for and a method of processing audio signals Jul. 30, 2013
8494178 Avoiding audio feedback Jul. 23, 2013
8488776 Echo suppressing method and apparatus Jul. 16, 2013
8477956 Howling suppression device, howling suppression method, program, and integrated circuit Jul. 2, 2013
8473286 Noise feedback coding system and method for providing generalized noise shaping within a simple filter structure Jun. 25, 2013
8462962 Sound processor, sound processing method and recording medium storing sound processing program Jun. 11, 2013
8433074 Echo suppressing method and apparatus Apr. 30, 2013
8433061 Reducing echo Apr. 30, 2013
8416946 System and process for regression-based residual acoustic echo suppression Apr. 9, 2013
8411871 Echo cancellation Apr. 2, 2013
8406430 Simulated background noise enabled echo canceller Mar. 26, 2013
8391471 Echo suppressing apparatus, echo suppressing system, echo suppressing method and recording medium Mar. 5, 2013
8385557 Multichannel acoustic echo reduction Feb. 26, 2013
8369511 Robust method of echo suppressor Feb. 5, 2013
8369512 Device and method for detecting a divergence of an adaptive system and use of such a device for the detection of a divergence of a digital filter Feb. 5, 2013
8364298 Filtering application sounds Jan. 29, 2013
8325909 Acoustic echo suppression Dec. 4, 2012
8320553 Enhanced echo cancellation Nov. 27, 2012
8311590 System and method for improved loudspeaker functionality Nov. 13, 2012
8306214 Method and system for clear signal capture Nov. 6, 2012
8300801 System and method for telephone based noise cancellation Oct. 30, 2012
8295474 Echo canceller with heavy double-talk estimation Oct. 23, 2012
8275139 Linear full duplex system and method for acoustic echo cancellation Sep. 25, 2012
8271051 Method and system for double-end talk detection, and method and system for echo elimination Sep. 18, 2012
8265289 Method and system for clear signal capture Sep. 11, 2012
8260220 Communication device with reduced noise speech coding Sep. 4, 2012
8213598 Harmonic distortion residual echo suppression Jul. 3, 2012
8208621 Systems and methods for acoustic echo cancellation Jun. 26, 2012
8194850 Method and apparatus for voice communication Jun. 5, 2012
8155302 Acoustic echo canceller Apr. 10, 2012
8144863 Method and apparatus for echo cancellation Mar. 27, 2012
8130879 Apparatus and method for interference cancellation in receiver of communication system Mar. 6, 2012
8107616 Acoustic echo canceller Jan. 31, 2012
8094809 Frame-based level feedback calibration system for sample-based predictive clipping Jan. 10, 2012
8090077 Testing acoustic echo cancellation and interference in VoIP telephones Jan. 3, 2012
8086205 Multimode receiver with active blocker suppression Dec. 27, 2011
8085945 Communication machine room wideband noise suppression system Dec. 27, 2011
8073497 Echo canceller with correlation using pre-whitened data values received by downlink codec Dec. 6, 2011
8068884 Acoustic echo reduction circuit for a "hands-free" device usable with a cell phone Nov. 29, 2011
8064966 Method of detecting a double talk situation for a "hands-free" telephone device Nov. 22, 2011
8054966 Echo cancellation and noise reduction adaptation during ringing signal playback Nov. 8, 2011
8045702 Multi-path active hybrid circuit Oct. 25, 2011

1 2 3 4 5 6

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