A method and an apparatus to encode and decode a speech signal using a code excited linear prediction (CELP) algorithm. In order to reduce a bit rate without degrading performance in an enhancement layer based on CELP, each of a fixed codebook of a core layer and a fixed codebook of the enhancement layer is divided into a plurality of spaces. The spaces of the fixed codebook of the enhancement layer excludes a space corresponding to a least distorted space determined from among the spaces of the fixed codebook of the core layer are searched.

Method and apparatus to search fixed codebook and method and appratus to encode/decode a speech signal using the method and apparatus to search fixed codebook

李康殷

Papers

Method and apparatus to search fixed codebook and method and appratus to encode/decode a speech signal using the method and apparatus to search fixed codebook