Speech coding system and a method of encoding speech

Details Speech coding system and a method of encoding speech Speech coding system and a method of encoding speech

G - Physics

10

L

354/47

G10L 19/12 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2023167

A speech coding system of the code excited linear prediction (CELP) type comprises means (24,26) for filtering digitised 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 (38). 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 resynthesised. Using a one-dimensional codebook (110) reduces the amount of computation which is required compared to using a two-dimensional codebook.

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