Voiced/unvoiced classification of speech for excitation codebook

Details Voiced/unvoiced classification of speech for excitation codebook Voiced/unvoiced classification of speech for excitation codebook

1995-06-07

1998-03-24

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704214, 704219, 704222, G10L 914

Patent

active

057323895

ABSTRACT:
A CELP speech decoder includes a first portion comprising an adaptive codebook and a second portion comprising a fixed codebook. The CS-ACELP decoder generates a speech excitation signal selectively based on output signals from said first and second portions when said decoder fails to receive reliably at least a portion of a current frame of compressed speech information. The decoder does this by classifying the speech signal to be generated as periodic (voiced) or non-periodic (unvoiced) and then generating an excitation signal based on this classification. If the speech signal is classified as periodic, the excitation signal is generated based on the output signal from the first portion and not on the output signal from the second portion. If the speech signal is classified as non-periodic, the excitation signal is generated based on the output signal from said second portion and not on the output signal from said first portion.

REFERENCES:
patent: 5091945 (1992-02-01), Kleijn
Georg Plenge, Christfried Weck, and Detlef Wiese, "Combined Channel Coding and Concealment", IEE Colloquium No. 042: Terrestrial DAB--Where is it Going?,pp. 3/1-3/8, Feb. 17, 1993.
Allen Gersho, "Advances in Speech and Audio Compression", Proc. IEEE, vol. 82, No. 6, pp.900-918, Jun. 1994.
M. M. Lara-Barron et al., "Selective Discarding Procedure For Improved Tolerance To Missing Voice Packets," Electronics Letters, vol. 25, No. 19, Sep. 14, 1989, pp. 1269-1271.
A. W. Choi et al., "Effects Of Packet Loss On 3 Toll Quality Speech Coders,"Electrical Engineers, Second IEE National Conference On Telecommunications, York, UK, Apr. 2-5, 1989, pp. 380-385.

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