Title :
On improving performance of analysis by synthesis speech coders
Author :
Cucchi, S. ; Fratti, M. ; Ronchi, M.
Author_Institution :
Alcatel-Telettra, Milan, Italy
fDate :
5/1/1996 12:00:00 AM
Abstract :
An algorithm for improving the performance of analysis-by-synthesis (A-by-S) speech coders is presented. It is shown that proper modifications of the A-by-S strategies commonly used to determine the excitation parameters can be devised. In particular, a redefinition of the classical objective function based on the weighted mean squared error criterion may allow a better tracking of the speech signal transients as well as a better alignment of the synthetic pitch pulses. The implementation details of the algorithm are discussed and experimental results are presented
Keywords :
linear predictive coding; speech coding; speech synthesis; vocoders; CELP; LPC; algorithm; analysis by synthesis speech coders; classical objective function; code excited linear prediction; excitation parameter; performance improvement; speech signal transients; synthetic pitch pulses; tracking; weighted mean squared error criterion; Algorithm design and analysis; Bit rate; Convergence; Degradation; Filters; Linear predictive coding; Performance analysis; Signal synthesis; Speech analysis; Speech synthesis;
Journal_Title :
Speech and Audio Processing, IEEE Transactions on
