Echo canceler with echo path change detector

Details Echo canceler with echo path change detector Echo canceler with echo path change detector

2005-09-20

2005-09-20

Tran, Sinh (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406040, C370S286000

Reexamination Certificate

active

06947552

ABSTRACT:
An echo canceler includes an adaptive filter that adapts to changes in an echo path, a double-talk detector, and an echo path change detector. The echo path change detector estimates the loss on the echo path, thereby distinguishing true double-talk from apparent double-talk detected by mistake because of a change in the echo path. The adaptive filter continues normal adaptation during the apparent double-talk state when echo path change is also detected. The necessary conditions for detection of echo path change preferably include a small separation between the estimated loss on the echo path and a long-term smoothed value of the estimated loss. The echo path change detector is useful in, for example, the cancellation of line echo in telephone switching systems.

REFERENCES:
patent: 6434110 (2002-08-01), Hemkumar
patent: 2002/0041678 (2002-04-01), Basburg-Ertem et al.
patent: 2002/0057790 (2002-05-01), Duttweiler et al.
Braught, Grant; Computer Science 251 Computer Organization Class#18—Inside the Gates—CMOS Technology; Dickinson College, Fall Semester 1999 (http://www.dickinson.edu/˜braught/courses/cs251f99/classes
otes18.html).
Fujii et al., “Double-Talk Detection Method with Detecting Echo Path Fluctuation”, Trans. Of IEICE of Japan, vol. J78-A No. 3, pp. 314-322 (1999).

Affiliated with

Also associated with

Rating

Echo canceler with echo path change detector 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 canceler with echo path change detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo canceler with echo path change detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3407532