Speech signal decoding method and apparatus, speech signal...

Details Speech signal decoding method and apparatus, speech signal... Speech signal decoding method and apparatus, speech signal...

G - Physics

10

L

G10L 19/04 (2006.01) G10L 11/06 (2006.01) G10L 19/08 (2006.01) G10L 21/02 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2324898

The quality of reconstructed speech on which background noise is superimposed is improved in a speech signal decoding apparatus for generating a speech signal by driving a filter, which is constituted by linear prediction coefficients, by an excitation signal. A smoothing circuit smoothes sound source gain in a noise segment using sound source gain that was obtained in the past. A smoothing-quantity limiting circuit calculates an amount of fluctuation on represented by diving, by the sound source gain, the absolute value of the difference between the sound source gain and the sound source gain that has been smoothed, and limits the value of the smoothed gain in such a manner that the amount of fluctuation will not exceed a certain threshold value.

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