Channel control and post filter for acoustic echo cancellation

Details Channel control and post filter for acoustic echo cancellation Channel control and post filter for acoustic echo cancellation

2007-02-13

2007-02-13

Tran, Sinh (Department: 2615)

Telephonic communications

Substation or terminal circuitry

C379S406050

Reexamination Certificate

active

10193689

ABSTRACT:
An acoustic echo canceller comprising an adaptive filter, a post filter, and an adjustable filter. The adaptive filter receives a reference signal and a near-end signal, cancels a portion of the echo in the near-end signal using the reference signal, and provides an intermediate signal having remaining echo not canceled by the adaptive filter. The post filter calculates the cross-correlation between the near-end signal and intermediate signal, and provides a set of coefficients based on a variable suppression parameter. The adjustable filter processes the intermediate signal based on the coefficients and provides an output signal having at least a portion of the remaining echo removed. The acoustic echo canceller may further comprise a channel control unit that provides control signals, an adjustable amplifier, a noise estimator that estimates the noise in the intermediate signal, and a noise reinsertion unit that reinserts a version of the estimated noise back into the output signal.

REFERENCES:
patent: 4965822 (1990-10-01), Williams
patent: 5263020 (1993-11-01), Yatsuzuka et al.
patent: 5721730 (1998-02-01), Genter
patent: 6147979 (2000-11-01), Michel et al.
patent: 6658107 (2003-12-01), Sorqvist et al.
patent: 6678376 (2004-01-01), Takahashi et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3886033