Mixed-excited phonetic vocoding at 265 bps

Author

Maia, R. Da S ; Cirigliano, R. J da R ; Rojtenberg, D. ; Resende, E. C V, Jr.

Author_Institution

Electr. Eng. Program/COPPE, Fed. Univ. of Rio de Janeiro, Brazil

Volume

1

fYear

2003

fDate

6-10 April 2003

Abstract

In this paper a phonetic vocoder which synthesizes speech using mixed excitation is presented. The encoder carries out HMM-based speech recognition and pitch analysis, whereas the decoder performs parameter extraction from HMM and builds a mixed excitation using pitch and bandpass voicing strengths. The vocoder at an average bit rate of 265 bit/s reaches good degree of intelligibility, while the use of mixed excitation significantly improves the speech quality with no increase of bit rate when compared with the conventional binary excitation pulse train/random noise.

Keywords

band-pass filters; frequency estimation; hidden Markov models; speech coding; speech intelligibility; speech processing; speech recognition; speech synthesis; vocoders; 256 bit/s; HMM-based speech recognition; bandpass voicing strength; intelligibility; mixed excitation; mixed-excited phonetic vocoding; parameter extraction; phonetic vocoder; pitch analysis; speech quality; speech synthesis; Bit rate; Decoding; Hidden Markov models; Parameter extraction; Performance analysis; Speech analysis; Speech enhancement; Speech recognition; Speech synthesis; Vocoders;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-7663-3

Type

conf

DOI

10.1109/ICASSP.2003.1198901

Filename

1198901