Voice coding and decoding method and device therefor

Details Voice coding and decoding method and device therefor Voice coding and decoding method and device therefor

1997-05-27

1999-03-16

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704220, G10L 302, G10L 900

Patent

active

058842519

ABSTRACT:
In a voice coding and decoding method and apparatus using an RCELP technique, a CELP-series decoder can be obtained at a low transmission rate. A voice spectrum is extracted by performing a short-term linear prediction on voice signal. An error range in a formant region is widened during adaptive and renewal codebook search by passing said preprocessed voice through a formant weighting filter and widening an error range in a pitch on-set region by passing the same through a voice synthesis filter and a harmonic noise shaping filter. An adaptive codebook is searched using an open-loop pitch extracted on the basis of the residual minus of a speech. A renewal excited codebook produced from an adaptive codebook excited signal is searched. Finally, a predetermined bit is allocated to various parameters to form a bit stream.

REFERENCES:
patent: 5265167 (1993-11-01), Akamine
Parsons, T.W. et al., Voice and Speech Processing, McGraw Hill series in elec. eng., p. 264, Dec. 30, 1987.
Telecommunication Standardization Sector, Study Group, Geneva, May 27-Jun. 7, 1996, NEC Corp. High Level Description of Proposed NEC 4 kbps Speech Codec Candidate, M. Serizawa.
U.S. Dept. of Defense, The DOD 4.8 KBPS Standard (Proposed Federal Standard 1016), Campbell, et al. pp. 121-133.

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