Techniques for improving the performance of CELP type speech coders

Author

Gerson, Ira A. ; Jasiuk, Mark A.

Author_Institution

Motorola Inc., Schaumburg, IL, USA

fYear

1991

fDate

14-17 Apr 1991

Firstpage

205

Abstract

Techniques for improving the performance of CELP (code excited linear prediction) type speech coders while maintaining reasonable computational complexity are explored. A harmonic noise weighting function which enhances the perceptual quality of the processed speech is introduced. The combination of harmonic noise weighting and subsample resolution pitch significantly improves the coder performance for voiced speech. A 6.9 kb/s VSELP speech coder which incorporates subsample resolution pitch and harmonic noise weighting is described. Complexity reduction techniques are discussed which allow the coder to be implemented using a single fixed point digital signal processor

Keywords

computational complexity; encoding; filtering and prediction theory; speech analysis and processing; vocoders; 6.9 kbit/s; CELP; VSELP speech coder; code excited linear prediction; complexity reduction techniques; computational complexity; harmonic noise weighting function; perceptual quality; performance improvement; single fixed point digital signal processor; speech coding; subsample resolution pitch; voiced speech; Adaptive filters; Computational complexity; Digital signal processing; Laboratories; Noise reduction; Power harmonic filters; Speech analysis; Speech coding; Speech enhancement; Speech processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on

Conference_Location

Toronto, Ont.

ISSN

1520-6149

Print_ISBN

0-7803-0003-3

Type

conf

DOI

10.1109/ICASSP.1991.150313

Filename

150313