System and method for echo cancellation

Details System and method for echo cancellation System and method for echo cancellation

2008-03-18

2008-03-18

Singh, Ramnandan (Department: 2614)

Multiplex communications

Duplex

Transmit/receive interaction control

C379S406140

Reexamination Certificate

active

11262007

ABSTRACT:
An apparatus and method for canceling an echo signal is disclosed. The apparatus includes an echo filter, an up-sampler, an interpolation filter, and a signal combining apparatus. The echo filter filters the transmitted signal, the up-sampler up-samples the output of the echo filter, the interpolation filter filters the up-sampled output to generate a signal that emulates the echo signal, and the signal combining apparatus combines the signal emulating the echo signal with the received signal to remove echo signal. The method estimates an impulse response of the echo channel for estimation of filter coefficients of an echo filter. The transmit signal is then filtered in the echo filter to generate an output, which is up-sampled to generate another output. The up-sampled output is filtered by the interpolation filter to generate a signal that emulates the echo signal, which is then combined with the received signal to cancel the echo signal.

REFERENCES:
patent: 5305307 (1994-04-01), Chu
patent: 5774561 (1998-06-01), Nakagawa et al.
patent: 6628781 (2003-09-01), Grundstrom et al.
patent: 2002/0191779 (2002-12-01), Pham

Affiliated with

Also associated with

Rating

System and method for 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 System and method for echo cancellation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for echo cancellation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3950334