Speech encoding method and apparatus including a codebook storin

Details Speech encoding method and apparatus including a codebook storin Speech encoding method and apparatus including a codebook storin

1997-08-15

1999-07-20

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, G10L 914

Patent

active

059267852

ABSTRACT:
A speech encoding method including generating a reconstruction speech vector by using a code vector extracted from a codebook storing a plurality of code vectors for encoding a speech signal. In addition an input speech signal to be encoded is used as a target vector to generate an error vector representing the error of the reconstruction speech vector with respect to the target vector, and the error vector is passed through a perceptual weighting filter having a transfer function including the inverse characteristics of the transfer function of a filter for emphasizing the spectrum of a reconstructed speech signal. Thus a weighted error vector is generated, the codebook for a code vector that minimizes the weighted error vector is searched, and an index corresponding to the code vector found as an encoding parameter is output.

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