Gain control method for acoustic echo cancellation and...

Details Gain control method for acoustic echo cancellation and... Gain control method for acoustic echo cancellation and...

2005-11-01

2005-11-01

Harold, Jefferey F. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406060, C379S406070, C379S406010

Reexamination Certificate

active

06961422

ABSTRACT:
A gain control method for reducing or eliminating the undesirable effects of acoustic echo coupling between a speaker and a microphone while providing a full-duplex connection. Weighted normalized far-end and near-end powers are used to first calculate a suppression value which is used to determine the attenuation factor between an upper and a lower limit, thus improving reliability in noisy environments. To further improve the quality of the full-duplex connection, a smoothing factor is applied to the attenuation calculation to provide a low power and constant sounding echo without annoying transient-like sounds.

REFERENCES:
patent: 4600815 (1986-07-01), Horna
patent: 5016271 (1991-05-01), Ford
patent: 5657384 (1997-08-01), Staudacher et al.
patent: 5668794 (1997-09-01), McCaslin et al.
patent: 5790657 (1998-08-01), Fujiwara
patent: 6148078 (2000-11-01), Romesburg
patent: 6185300 (2001-02-01), Romesburg
patent: 6195430 (2001-02-01), Eriksson et al.
patent: 6282176 (2001-08-01), Hemkumar
patent: 6507653 (2003-01-01), Romesburg
Breining, Christina, et al., “Acoustic Echo Control, An Application of Very-High-Order Adaptive Filters,” IEEE Signal Processing Magazine, Jul. 1, 1999. pp. 42-69.
Puder, Henning, et al., “Implementation of a Hands-Free Car Phone with Echo Cancellation and Noise-Dependent Loss Control,” Proc. IEEE, ICASSP, 2000, vol. 6, pp. 3622-3625.

Affiliated with

Also associated with

Rating

Gain control method for acoustic echo cancellation and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3497914