Patent ID: 6175817
Filing Date: 2001-01-16
Classification: G10L

Abstract:
A method for vector quantizing a speech sample, said method comprising the following steps:a) entering fixed excitation vectors of an LPC filter for speech prediction in a first codebook (CB1),b) entering excitation vectors of a pitch synthesis filter in a second codebook (CB2);c) modifying said excitation vectors in said second codebook (CB2) after each sub-frame;d) establishing a predetermined error criterion for selection of excitation vectors from the second codebook (CB2);e) selecting at least two of said excitation vectors from the second codebook (CB2) to obtain optimum prediction values according to said predetermined error criterion;f) linking said at least two excitation vectors selected in step e) with a plurality of said excitation vectors from said first codebook (CB1) to form a set of linked vectors;g) selecting a matching vector from said linked vectors having a minimal variation from said speech sample according to a predetermined variation guideline; andh) thinning out said fixed excitation vectors in said first codebook.