Echo canceller with talk state determination to control speech p

Details Echo canceller with talk state determination to control speech p Echo canceller with talk state determination to control speech p

1997-01-31

1999-07-06

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704221, 704226, 379410, H04B 323, G10L 302

Patent

active

059208341

ABSTRACT:
A method and apparatus for controlling various functional elements in a digital telephone system using state determination from an echo canceller. An echo canceller is used to evaluate which one of five talk states two speakers are engaged in during a telephone conversation. This state determination information is used to control a tone detector function, a noise suppressor function, an adaptive equalizer function, a transmission mute function, and a vocoder encoder function within a vocoder. During the talk state where the far-end speaker is active and the near-end speaker is inactive, the echo canceller provides a signal which disables background noise estimates from being performed in the noise suppressor and the vocoder encoder. The same signal is used to disable the tone detector and to enable the transmission mute function during this talk state.

REFERENCES:
patent: 5307405 (1994-04-01), Sih
patent: 5598468 (1997-01-01), Ammicht et al.
patent: 5742734 (1998-04-01), DeJaco et al.
David G. Messerschmitt, "Echo Cancellation in Speech and Data Transmission," IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 2, pp. 283-297, Mar. 1984.

Affiliated with

Also associated with

Rating

Echo canceller with talk state determination to control speech p 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 canceller with talk state determination to control speech p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo canceller with talk state determination to control speech p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-907371