An Adaptive Codebook Search Method Based on a Correlation Function in Code-Excited Linear Predictive Coding

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adaptive codebook search method in code-excited linear prediction, and more particularly, to a method and apparatus for estimating a gain vector from a past excitation signal, To an adaptive codebook search method that can be expressed as a scalar.;The adaptive codebook search method according to the present invention can model a multi-gain with a single gain using the correlation of excitation signals. Therefore, through the adaptive codebook search method according to the present invention, the encoding performance of the Multi-tap Multi-gain Adaptive Codebook (MMAC) scheme in the CELP structure can be reduced and a saving effect of 2 bits per subframe can be obtained.