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Class Information
Number: 379/406.08
Name: Telephonic communications > Echo cancellation or suppression > Using digital signal processing > Adaptive filtering
Description: Subject matter in which a filter having coefficients which change according to an algorithm is used to generate a model of the feedback or echo path in order to generate a counterwave to cancel the echo or feedback.










Sub-classes under this class:

Class Number Class Name Patents
379/406.09 Least mean squares (lms) algorithm 151
379/406.1 With training sequence 119


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Patent Number Title Of Patent Date Issued
8693677 Techniques for updating filter coefficients of an adaptive filter Apr. 8, 2014
8693678 Device and method for controlling damping of residual echo Apr. 8, 2014
8693698 Method and apparatus to reduce non-linear distortion in mobile computing devices Apr. 8, 2014
8687797 Method and system for a dual echo canceller Apr. 1, 2014
8675883 Apparatus and associated methodology for suppressing an acoustic echo Mar. 18, 2014
8666058 Time domain adaptive filter bank for network echo reduction or cancellation Mar. 4, 2014
8654967 System for conditioning echo response of loop start trunk line Feb. 18, 2014
8650010 Apparatus and method for generating a test signal with emulated crosstalk Feb. 11, 2014
8644494 Echo canceler Feb. 4, 2014
8644495 Echo canceler Feb. 4, 2014
8634547 Echo canceller operative in response to fluctuation on echo path Jan. 21, 2014
8634546 Signal processing device, echo canceller, and signal processing method Jan. 21, 2014
8630405 Echo removing apparatus Jan. 14, 2014
8625775 Method and system for reducing echo and noise in a vehicle passenger compartment environment Jan. 7, 2014
8619970 Echo cancellers and echo cancelling methods Dec. 31, 2013
8605890 Multichannel acoustic echo cancellation Dec. 10, 2013
8588404 Method and apparatus for acoustic echo cancellation in VoIP terminal Nov. 19, 2013
8577019 Methods, apparatus and articles of manufacture to detect echo during teleconferences Nov. 5, 2013
8565416 Cache-based echo canceller Oct. 22, 2013
8565127 Voice-activity detection based on far-end and near-end statistics Oct. 22, 2013
8553823 Method for identifying signals of the same origin Oct. 8, 2013
8538008 Acoustic echo canceler using an accelerometer Sep. 17, 2013
8526599 Input/output apparatus and communication terminal Sep. 3, 2013
8515054 Voice and data exchange over a packet based network with echo cancellation Aug. 20, 2013
8498407 Systems and methods for double-talk detection in acoustically harsh environments Jul. 30, 2013
8494178 Avoiding audio feedback Jul. 23, 2013
8477956 Howling suppression device, howling suppression method, program, and integrated circuit Jul. 2, 2013
8467521 Echo canceler circuit and method Jun. 18, 2013
8462958 Apparatus and method for computing filter coefficients for echo suppression Jun. 11, 2013
8452002 Methods, apparatus and articles of manufacture to cancel echo for communication paths having long bulk delays May. 28, 2013
8441515 Method and apparatus for minimizing acoustic echo in video conferencing May. 14, 2013
8433059 Echo canceller canceling an echo according to timings of producing and detecting an identified frequency component signal Apr. 30, 2013
8433060 Method and system for stereo echo cancellation for VoIP communication systems Apr. 30, 2013
8428114 Transmit equalizer compensation for probe receivers Apr. 23, 2013
8416959 Hearing enhancement system and components thereof Apr. 9, 2013
8411846 Echo path change detection in telecommunications networks Apr. 2, 2013
8406430 Simulated background noise enabled echo canceller Mar. 26, 2013
8401201 Sound processing apparatus and method Mar. 19, 2013
8391471 Echo suppressing apparatus, echo suppressing system, echo suppressing method and recording medium Mar. 5, 2013
8391472 Acoustic echo cancellation solution for video conferencing Mar. 5, 2013
8385557 Multichannel acoustic echo reduction Feb. 26, 2013
8385539 Method and arrangement for controlling adaptive filters Feb. 26, 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
8369251 Timestamp quality assessment for assuring acoustic echo canceller operability Feb. 5, 2013
8364480 Method and apparatus for controlling echo in the coded domain Jan. 29, 2013
8363821 Apparatus and method for canceling echo Jan. 29, 2013
8364477 Method and apparatus for increasing speech intelligibility in noisy environments Jan. 29, 2013
8345860 Method and system for detection of onset of near-end signal in an echo cancellation system Jan. 1, 2013
8335311 Communication apparatus capable of echo cancellation Dec. 18, 2012
8331552 Detection of double talk in telecommunications networks Dec. 11, 2012

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