Method and apparatus for decoding speech signal

Details Method and apparatus for decoding speech signal Method and apparatus for decoding speech signal

G - Physics

10

L

G10L 19/12 (2006.01) G10L 19/08 (2006.01) G10L 21/02 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2317969

A method of decoding a speech signal based on a CELP (Code Excited Linear Prediction) with improvement in degradation of decoded sound quality in a noise period. The method includes the steps of: calculating a norm of an excitation vector for each fixed period in a noise period; smoothing the calculated norm using a norm obtained in a previous period; changing the amplitude of the excitation vector in the period using the calculated norm and the smoothed norm; and driving a synthesizing filter by the excitation vector with the changed amplitude.

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