Patent ID: 6996522

Claim:
A method of encoding a speech signal in a code excited linear prediction (CELP)-based speech processing system that includes an adaptive codebook and a fixed codebook, wherein the speech signal is divided into frames and each frame is further divided into sequential sub-frames, the method comprising: generating linear prediction coding (LPC) coefficients for a frame; generating pitch-related information by using the adaptive codebook, for the sequential sub-frames of the frame; generating fixed-code pulse information by using the fixed codebook, for a plurality of selected sub-frames of the frame; generating a first bit-stream corresponding to the frame for the LPC coefficients, the pitch-related information, and the fixed-code pulse information for the plurality of selected sub-frames; generating fixed-code pulse information by using the fixed codebook, for unselected sub-frames; and separately generating a second bit-stream corresponding to speech enhancement of the frame from the fixed-code pulse information for the unselected sub-frames.