Apparatus and method for speech coding

Details Apparatus and method for speech coding Apparatus and method for speech coding

G - Physics

10

L

G10L 19/12 (2006.01)

Patent

CA 2722110

A speech encoder comprising an LPC synthesizing means, a gain calculating means and a parameter coding means for performing predictive coding of gains of an adaptive excitation vector and a stochastic excitation vector associated with indexes searched in the gain calculating means is provided. The parameter coding means comprises prediction coefficient adjusting means for adjusting one or more prediction coefficients used in the predictive coding according to one or more past subframe states. The speech encoder automatically adjusts prediction coefficients when the state value in a preceding subframe is an extremely large value or an extremely small value in predictive quantization with less including local abnormal sounds.

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