Patent ID: 6108624
Filing Date: 2000-08-22
Classification: G10L

Abstract:
A method for improving performance of a voice coder comprising the steps of:calculating a target signal for a window;determining K optimal candidate codebooks and K optimal candidate codebook gains for a first subframe from said target signal for a window, all codebook indices and all optimal codebook gains;calculating K target signals for a second subframe from said target signal for a window and said optimal candidate codebooks and optimal candidate codebook gains for the first subframe;determining L optimal candidate codebooks and L optimal candidate codebook gains for a second subframe from said target signal for the second subframe and said optimal candidate codebooks and optimal candidate codebook gains for the first subframe; andselecting an optimal codebook and optimal codebook gain for said two subframes respectively from said target signal for a window;selecting optimal candidate gains and all possible quantized gains for said first subframe; andselecting optimal codebook and optimal candidate codebook gains for said second subframe.