Digital sound recording and reproduction device using a coding t

Details Digital sound recording and reproduction device using a coding t Digital sound recording and reproduction device using a coding t

1995-09-27

1997-09-16

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704201, 704258, 704262, 704265, 704270, G10L 914

Patent

active

056689241

ABSTRACT:
A sound recording and reproducing device codes a sound signal by a code excited linear predictive coding means including an adaptive code book created on the basis of past excitation signals, a stochastic code book having a plurality of different stochastic signals and a pulse code book having a plurality of pulse signals. When decoding the sound data coded frame by frame by code excited linear predictive coding, each frame comprising a plurality of sub-frames, by using an adaptive code book created on the basis of a past excitation signal, and a stochastic code book having a plurality of different stochastic signals, a switch controller controls switches such that the coded data in a predetermined sub-frame of each frame is skipped in accordance with the rate of change of reproduction speed to decode the coded data in the remaining sub-frame or sub-frames without decoding the coded data in the skipped sub-frame, and the contents of the adaptive code book are renewed.

REFERENCES:
patent: 4868867 (1989-09-01), Davidson et al.
patent: 5457783 (1995-10-01), Harprit
patent: 5495555 (1996-02-01), Swaminathan

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