ON IMPROVING PERFORMANCE OF ANALYSIS-BY-SYNTHESIS SPEECH CODERS

An algorithm for improving the performance of analysis-by-synthesis (A -by-S) speech coders is presented. It is shown that proper modificatio ns of the A-by-S strategies commonly used to determine the excitation parameters can be devised. In particular, a redefinition of the classi cal objective function based on the weighted mean squared error criter ion may allow a better tracking of the speech signal transients as wel l as a better alignement of the synthetic pitch pulses. The implementa tion details of the algorithm are discussed and experimental results a re presented.