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Class Information
Number: 379/406.15
Name: Telephonic communications > Echo cancellation or suppression > Using digital signal processing > Additional analog processing
Description: Subject matter in which significant analog signal processing take place in addition to digital signal processing.

Patents under this class:

Patent Number Title Of Patent Date Issued
8675883 Apparatus and associated methodology for suppressing an acoustic echo Mar. 18, 2014
8498423 Device for and a method of processing audio signals Jul. 30, 2013
8494592 Enhanced call reception and privacy Jul. 23, 2013
8364298 Filtering application sounds Jan. 29, 2013
8254560 Oscillation-echo preventing circuit and microphone/speaker unit Aug. 28, 2012
8229104 Full duplex telephone system employing automatic level control for improved digital signal processing of audio signals Jul. 24, 2012
8160241 Communication terminal device with echo canceller and its echo canceling method Apr. 17, 2012
8094809 Frame-based level feedback calibration system for sample-based predictive clipping Jan. 10, 2012
8023641 Spectral domain, non-linear echo cancellation method in a hands-free device Sep. 20, 2011
7844365 Field-mounted process device Nov. 30, 2010
7835774 Removal of local duplication voice on conference calls Nov. 16, 2010
7672445 Method and system for nonlinear echo suppression Mar. 2, 2010
7480377 Dual adaptive filter apparatus and method Jan. 20, 2009
7471671 Band signal detection and presentation for IP phone Dec. 30, 2008
7151828 Circuit arrangement for the analogue suppression of echoes Dec. 19, 2006
7062040 Suppression of echo signals and the like Jun. 13, 2006
6912474 Method and apparatus for high-speed synchronous digital acquisition derived in real -time from analog samples Jun. 28, 2005
6836544 Sidestone reduction in full duplex transceivers Dec. 28, 2004
6744884 Speaker-phone system change and double-talk detection Jun. 1, 2004
6611601 Echo sound signal suppressing apparatus Aug. 26, 2003
6487178 Methods and apparatus for providing volume control in communicating systems including a linear echo canceler Nov. 26, 2002
6339642 Telephone apparatus with howling prevention function Jan. 15, 2002
6278785 Echo cancelling process with improved phase control Aug. 21, 2001
6157680 Audio distortion canceler method and apparatus Dec. 5, 2000
5943319 Packet format interface for telecommunication instruments Aug. 24, 1999
RE35901 Solid state isolation device using opto-isolators Sep. 22, 1998
5691978 Self-cancelling full-duplex RF communication system Nov. 25, 1997
5504778 Analog circuit for baseband modem Apr. 2, 1996
5381475 Arrangement for suppressing echoes in a digital portable telephone Jan. 10, 1995
5323458 Echo cancellation in a full-duplex speakerphone Jun. 21, 1994
5206854 Detecting loss of echo cancellation Apr. 27, 1993
5204894 Personal electronic directory Apr. 20, 1993
5148427 Non-linear echo canceller Sep. 15, 1992
5084866 Transversal filter echo canceller Jan. 28, 1992
5075687 Echo suppression with both digital and analog variable attenuators Dec. 24, 1991
5022074 Digital echo suppressor Jun. 4, 1991
5016271 Echo canceler-suppressor speakerphone May. 14, 1991
4972406 Echo canceller Nov. 20, 1990
4928308 Echo canceller circuit May. 22, 1990
4891801 Terminal for the transmission of data over a bidirectional analog channel with echo cancellation controlled by the reception rate Jan. 2, 1990
4696015 Echo correction especially for television broadcast systems Sep. 22, 1987
4368360 Adaptive control type echo suppressor Jan. 11, 1983
4215252 Video teleconference audio echo control unit Jul. 29, 1980
4081616 Method of and apparatus for eliminating the side tone of a telephone station Mar. 28, 1978
4031338 Echo suppressor using frequency-selective center clipping Jun. 21, 1977
4012603 Echo suppressor having self-adaptive means Mar. 15, 1977
4005277 Echo controller comprising a mode switch for switching echo suppressor and canceller Jan. 25, 1977
3935403 Device for developing a neutralization signal for an echo suppressor Jan. 27, 1976

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