Speech signal coding and/or decoding system

Details Speech signal coding and/or decoding system Speech signal coding and/or decoding system

G - Physics

10

L

354/54

G10L 19/06 (2006.01) G10L 19/00 (2006.01)

Patent

CA 1226947

ABSTRACT A speech signal coding AND/OR decoding system includes an LPC analyser for deriving linear predictive coefficients (i.e., LPC parameter) from an input speech signal. An attenuator is provided for attenuating the LPC parameter by a predetermined attenuation coefficient. An LPS analyser is provided for deriving Line Spectrum Pairs (i.e., LSP) parameters from the attenuated LPC parameter from the attenuator and generating a sequence of the LSP parameters as an input pattern. A reference pattern memory stores reference patterns each composed of a sequence of the LSP parameters obtained by LSP- analyzing a variety of predetermined speech samples, each of the reference patterns being labeled by a predetermined label. The reference pattern most closely resembling the input pattern is selected from the reference pattern memory and the label of the reference pattern selected is coded. The system of the invention provides improved reproduced speech quality and makes low bit rate transmission possible.

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