Spike code-excited linear prediction

Details Spike code-excited linear prediction Spike code-excited linear prediction

1995-09-29

1997-09-02

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704208, 704223, G10L 904

Patent

active

056640544

ABSTRACT:
A conventional CELP speech codec synthesizes a pitch interval in a sound by synthesizing a scaled innovation signal--typically, a random signal--and adding it to a scaled pitch signal derived from the synthesized speech of the previous pitch interval. This invention continues this practice when it is advantageous, but, at the onset of the sound or whenever else needed, replaces the scaled innovation signal with a scaled spike signal. This is done since a spike is sometimes more useful than an innovation signal is, innovation signals being by definition crafted to instead represent differences between adjacent pitch intervals within a sound rather than at the onset of a sound.

REFERENCES:
patent: 5119424 (1992-06-01), Asakawa et al.
patent: 5233660 (1993-08-01), Chen
Allen Gersho, "Advances in Speech and Audio Compression", Proc. IEEE, vol. 82, No. 6, pp. 900-918 Jun. 1994.
Andreas S. Spanias, "Speech Coding: A Tutorial Review", Proc. IEEE, vol. 82, No. 10, pp. 1541-1582 Oct. 1994.

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