Speech coding system and a method of encoding speech
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Aug 6, 1990
filing date -
Aug 16, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A speech coding system of the code excited linear prediction (CELP) type includes apparatus (24,26) for filtering digitized speech samples to form perceptually weighted speech samples. Entries in a one-dimensional codebook (110) comprising frame length sequences are filtered in a perceptually weighted synthesis filter (28) to form a one-dimensional filtered codebook. The filtered codebook entries are compared with the perceptually weighted speech signals to obtain a codebook index which gives the minimum perceptually weighted error when the speech is resynthesized. Using a one-dimensional codebook (110) reduces the amount of computation which is required compared to the use of a two-dimensional codebook.
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