Method and apparatus for speech-band signal coding

Details Method and apparatus for speech-band signal coding Method and apparatus for speech-band signal coding

G - Physics

10

L

354/47, 354/50

G10L 19/10 (2006.01)

Patent

CA 1229681

ABSTRACT A technique for coding signals in speech band is described. A pulse sequence and a spectral parameter representing an input signal in the speech band are determined for a first frame length using a pulse determining process which sequentially determines the new locations and amplitudes of pulses of the input signal on the basis of the locations and amplitudes determined in the past. The technique includes a first step of making the voiced-unvoiced decision of the input signal to output a judgment signal d and a second step of changing the processing mode of the pulse determining processing in response to the judgment signal. Using the invention speech quality is prevented from deteriorating due to quantization error between the coder and decoder sides.

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