Double talk, NLP and comfort noise

Details Double talk, NLP and comfort noise Double talk, NLP and comfort noise

2006-05-23

2006-05-23

Tsang, Fan (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406080, C379S406030

Reexamination Certificate

active

07050576

ABSTRACT:
A state machine for attenuating the transition into and out of NLP state to reduce voice clipping and to reduce echo leak in a voice over packet signal transmission. The state machine interposes two additional transitional states between the NLP active state and the NLP inactive state to eliminate the sharp transition of NLP activity. An NLP entering state is used to gradually reduce the mixing ratio of echo and voice to attenuate the transition from passage of echo in the NLP inactive state to the suppression of echo in the NLP active state. An NLP exiting state is used to gradually increase (ramping the change) the mixing ratio of echo and voice to attenuate the transition from suppression of echo in the NLP active state to passage of echo in the NLP inactive state. The rate of increase/decrease, the transition rate is determined based upon the signal parameters, including the presence of double talk and a transition rate indicator based unon these factors is generated in software to control the transition rate.

REFERENCES:
patent: 6125179 (2000-09-01), Wu
patent: 6424635 (2002-07-01), Song
patent: 6694019 (2004-02-01), Song
patent: 6738358 (2004-05-01), Bist et al.
patent: 2002/0080730 (2002-06-01), LeBlanc

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