A new variable rate speech coder based on fuzzy phonetic classification and CS-ACELP structure

Author

Beritelli, F.

Author_Institution

Istituto di Inf. e Telecommun., Catania Univ., Italy

fYear

1998

fDate

1998

Firstpage

587

Abstract

This paper presents a new variable bit-rate CELP speech coder based on fuzzy phonetic classification and CS-ACELP structure. The codec exploits new robust algorithms of multilevel phonetic classification and efficient activity/inactivity speech coding models. It uses 8 operating modes ranging from 0 to 8 kbit/s with an average bit rate of 4 kbit/s and an algorithmic delay of 15 ms. Subjective listening tests, performed in several acoustic noise conditions, demonstrate that performance is better than that of the GSM full-rate codec at 13 kbit/s and similar to that of the latest ITU-T standard for speech coding at 8 kbit/s, both in the discontinuous transmission mode

Keywords

acoustic noise; fuzzy logic; linear predictive coding; signal classification; speech coding; speech processing; variable rate codes; vocoders; 0 to 8 kbit/s; 13 kbit/s; CS-ACELP structure; acoustic noise; activity/inactivity models; discontinuous transmission mode; fuzzy phonetic classification; performance; subjective listening tests; variable rate speech coder; Acoustic noise; Acoustic testing; Bit rate; Code standards; Codecs; Delay; GSM; Performance evaluation; Robustness; Speech coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Proceedings, 1998. ICSP '98. 1998 Fourth International Conference on

Conference_Location

Beijing

Print_ISBN

0-7803-4325-5

Type

conf

DOI

10.1109/ICOSP.1998.770280

Filename

770280