Integrated noise cancellation and residual echo suppression

Details Integrated noise cancellation and residual echo suppression Integrated noise cancellation and residual echo suppression

2006-04-11

2006-04-11

Tran, Sinh (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406070

Reexamination Certificate

active

07027591

ABSTRACT:
A combined processor, such as might be used in a mobile handset or hands-free communication device, provides residual echo suppression and noise reduction while eliminating the need for explicit comfort noise generation. Operating within a near-end communication device, the processor receives an echo-canceled signal that is derived from a near-end input signal, and generates an output signal for subsequent transmission to a far-end communication device by applying a noise attenuation factor to the echo-canceled signal or to an average of that signal. The processor maintains the average signal across periods of speech and non-speech. During far-end-modes of operation, where only incoming audio from the far-end is active, the processor substitutes the average signal for the echo-canceled signal, such that a far-end listener receives the natural sounding average signal without receiving the objectionable, residual echo that may be in the echo-canceled signal.

REFERENCES:
patent: 5636272 (1997-06-01), Rasmusson
patent: 5796819 (1998-08-01), Romesburg
patent: 5835851 (1998-11-01), Rasmusson et al.
patent: 5937060 (1999-08-01), Oh
patent: 6148078 (2000-11-01), Romesburg
patent: 6160886 (2000-12-01), Romesburg et al.
patent: 6185300 (2001-02-01), Romesburg
patent: 6301357 (2001-10-01), Romesburg
patent: WO 98/33311 (1998-07-01), None
patent: WO 0119062 (2001-03-01), None
Beghdad Ayad, Gerard Faucon and Regine Le Bouquin-Jeannes; Optimization of a Noise Reduction Preprocessing in an Acoustic Echo and Noise Controller; 1996; 4 pgs.
Seon Joon Park, Chum Gun Cho, Chungyong Lee, and Dae Hee Youn, On Integrating Acoustic Echo and Noise Cancellation Systems for Hands-Free Telephony; 4 pgs.

Affiliated with

Also associated with

Rating

Integrated noise cancellation and residual echo suppression does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Integrated noise cancellation and residual echo suppression, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Integrated noise cancellation and residual echo suppression will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3574342