Echo canceling method, echo canceller and voice switch

Details Echo canceling method, echo canceller and voice switch Echo canceling method, echo canceller and voice switch

2005-03-15

2005-03-15

Isen, Forester W (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406060, C379S406080, C379S406090, C379S406050

Reexamination Certificate

active

06868157

ABSTRACT:
A digitized input signal is sampled, to obtain a reference input signal. The reference input signal is spuriously whitened, to obtain a pseudo whitened signal. An echo replica signal is generated on the basis of the pseudo whitened signal and an adaptive filter coefficient. A cancellation error signal is obtained on the basis of an echo signal and the echo replica signal. The adaptive filter coefficient is updated on the basis of the cancellation error signal, the adaptive filter coefficient, and the pseudo whitened signal.

REFERENCES:
patent: 4029912 (1977-06-01), Geigel et al.
patent: 5305307 (1994-04-01), Chu
patent: 5307405 (1994-04-01), Sih
patent: 5544242 (1996-08-01), Robinson
patent: 5553014 (1996-09-01), De Leon, II et al.
patent: 5559881 (1996-09-01), Sih
patent: 5646991 (1997-07-01), Sih
patent: 5649012 (1997-07-01), Gupta et al.
patent: 5687229 (1997-11-01), Sih
patent: 5774561 (1998-06-01), Nakagawa et al.
patent: 5912966 (1999-06-01), Ho
patent: 43 17 043 (1994-11-01), None
patent: 0 376 582 (1990-07-01), None
patent: 0 732 838 (1996-09-01), None
patent: 62-071362 (1987-04-01), None
patent: 64-2424 (1989-01-01), None
patent: 1-157655 (1989-06-01), None
patent: 02-260857 (1990-10-01), None
patent: 2-309851 (1990-12-01), None
patent: 5-145378 (1993-06-01), None
patent: 6-78046 (1994-03-01), None
patent: 6-48832 (1994-06-01), None
patent: 8-321795 (1996-12-01), None
patent: 9-233002 (1997-09-01), None
International Preliminary Examination Report issued in PCT/JP98/04107 on Nov. 26, 1999, English-language translation (4 pages mailed May 8, 2000).
“Short Tail Echo Canceller Using Whitening Filter”, Inoue et al. Proceedings of the 5thSony Research Forum (1995), pp. 323-326. (Partial Translation).
Rudi Frenzel et al., “Using Prewhitening and Stepsize Control to Improve the Performance of the LMS Algorithm for Acoustic Echo Compensation”, pp. 1930-1932 (1992) IEEE.
Notice of Rejection with English translation dated Feb. 3, 2004.

Affiliated with

Also associated with

Rating

Echo canceling method, echo canceller and voice switch 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 canceling method, echo canceller and voice switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo canceling method, echo canceller and voice switch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3438307