Speech coding and decoding methods using adaptive and random cod

Details Speech coding and decoding methods using adaptive and random cod Speech coding and decoding methods using adaptive and random cod

1992-05-20

1995-03-07

MacDonald, Allen R.

395 23, G10L 900

Patent

active

053965760

ABSTRACT:
An excitation vector of the previous frame stored in an adaptive codebook is cut out with a selected pitch period. The excitation vector thus cut out is repeated until one frame is formed, by which a periodic component codevector is generated. An optimum pitch period is searched for so that distortion of a reconstructed speech obtained by exciting a linear predictive synthesis filter with the periodic component codevector is minimized. Thereafter, a random codevector selected from a random codebook is cut out with the optimum pitch period and is repeated until one frame is formed, by which a repetitious random codevector is generated. The random codebook is searched for a random codevector which minimizes the distortion of the reconstructed speech which is provided by exciting the synthesis filter with the repetitious random codevector.

REFERENCES:
patent: 4817157 (1989-03-01), Gerson
patent: 5119423 (1992-06-01), Shiraki et al.
patent: 5195137 (1993-03-01), Swaminathan

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