Residual echo elimination with proportionate noise injection

Details Residual echo elimination with proportionate noise injection Residual echo elimination with proportionate noise injection

H - Electricity

04

B

H04B 3/20 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2139895

Residual echo from an echo canceller circuit is reduced by a variable attenuator that operates in response to a processing circuit which determines and adjusts an attenuation factor. The attenuation factor is determined by comparing relative levels of the send input signal, the receive input signal, and the error signal remaining after removal of an expected echo signal from the send input signal. The variable attenuator provides linear power attenuation of the error signal in order to reduce transmission of the residual echo signal and to eliminate the perception of coupling and decoupling of the telephone connection which occurs in known echo cancellers employing center clipping. A noise injection circuit provides a noise signal that is injected into the transmitted signal in inverse proportion to the attenuation of the error signal in order to provide a constant noise level in the transmitted signal as the error signal is variably attenuated.

Affiliated with

Also associated with

Rating

Residual echo elimination with proportionate noise injection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Residual echo elimination with proportionate noise injection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Residual echo elimination with proportionate noise injection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1448297