Method and apparatus for decoding speech signal

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

2006-04-18

2006-04-18

Lerner, Martin (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S223000, C704S224000

Reexamination Certificate

active

07031913

ABSTRACT:
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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