Voice encoder using a voice activity detector

Details Voice encoder using a voice activity detector Voice encoder using a voice activity detector

1993-12-21

1996-04-16

MacDonald, Allen R.

395 221, 395 239, G10L 900

Patent

active

055091024

ABSTRACT:
A voice encoder using a voice activity detector in which two predictive coefficients available from an adaptive predictor in the voice encoder are received for each sample of a input voice signal of the voice encoder. Average values of the predictive coefficients are calculated for each fixed period to decide whether the period is a voice active period or a voice non-active period as a result of comparing the average values with respective ranges of predictive coefficient threshold values predetermined from respective distributions of the two predictive coefficients. Voice active
on-active flags indicative of the voice active period and the voice non-active period are obtained for voice operate switch exchange of encoded of the voice encoder.

REFERENCES:
patent: 4831636 (1989-05-01), Taniguchi et al.
patent: 4860313 (1989-08-01), Shpiro
patent: 4882758 (1989-11-01), Uekawa et al.
patent: 4956865 (1990-09-01), Lennig et al.
patent: 5058168 (1991-10-01), Koyama
patent: 5130985 (1992-07-01), Kondo et al.

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