Echo cancellation

Details Echo cancellation Echo cancellation

2005-08-16

2005-08-16

Barnie, Rexford (Department: 2643)

Telephonic communications

Echo cancellation or suppression

C379S406060, C379S406080, C379S417000, C381S093000, C381S094100

Reexamination Certificate

active

06931123

ABSTRACT:
An audio conferencing system in which each participant in the conference generates a monaural signal for transmission on an output channel to the other participants, and receives a plurality of input channels from the other participants. The input channels are individually converted to stereophonic signal pairs by respective filter banks having selected predetermined transfer functions. The stereo channels are combined linearly to provide a stereophonic audio output. The system has an echo cancellation system in which an adaptive filter process is applied to the input channels to generate a combined echo cancellation signal for applying to the output channel.

REFERENCES:
patent: 4956867 (1990-09-01), Zurek et al.
patent: 5363441 (1994-11-01), Feiner et al.
patent: 5425059 (1995-06-01), Tsujimoto
patent: 5555310 (1996-09-01), Minami et al.
patent: 5848146 (1998-12-01), Slattery
patent: 5960077 (1999-09-01), Ishii et al.
patent: 6246760 (2001-06-01), Makino et al.
patent: 6256394 (2001-07-01), Deville et al.
patent: 6442272 (2002-08-01), Osovets
patent: 6556682 (2003-04-01), Gilloire et al.
patent: 6611603 (2003-08-01), Norris et al.
patent: WO 99/53673 (1999-10-01), None

Affiliated with

Also associated with

Rating

Echo cancellation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Echo cancellation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo cancellation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3462300