Acoustic echo canceler and handsfree telephone set

Details Acoustic echo canceler and handsfree telephone set Acoustic echo canceler and handsfree telephone set

2006-02-21

2006-02-21

Tran, Sinh (Department: 2646)

Telephonic communications

Echo cancellation or suppression

C379S406020, C379S406050, C379S406060, C379S406080, C379S406090

Reexamination Certificate

active

07003095

ABSTRACT:
The present invention provides an acoustic echo canceler for use in a telephone set having a handsfree conversation function. This acoustic echo canceler simultaneously achieves both the stabilization and speedup of an estimation operation and also attains the more improvement of speech quality. Moreover, the present invention provides a handsfree telephone set employing this acoustic echo canceler. Furthermore, this acoustic echo canceler is operative to cancel an echo generated by inputting an output of an acoustic device to itself substantially simultaneously with the outputting the output thereof. Further, this acoustic echo canceler comprises an adaptive filter for performing an operation of estimating the frequency characteristic and the phase characteristic of a part, whose frequency characteristic and phase characteristic vary, on an acoustic path and a fixed coefficient filter for simulating a part, whose frequency characteristic and phase characteristic are fixed, on the acoustic path.

REFERENCES:
patent: 5187692 (1993-02-01), Haneda et al.
patent: 5187741 (1993-02-01), Erving et al.
patent: 5815580 (1998-09-01), Craven et al.
patent: 6574336 (2003-06-01), Kirla
patent: 6744887 (2004-06-01), Berstein et al.

Affiliated with

Also associated with

Rating

Acoustic echo canceler and handsfree telephone set does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Acoustic echo canceler and handsfree telephone set, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic echo canceler and handsfree telephone set will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3662705