Harmonic-stochastic excitation (HSX) speech coding below 4 kbit/s

Author

Laflamme, C. ; Salami, R. ; Matmti, R. ; Adoul, J.-P.

Author_Institution

Dept. of Electr. Eng., Sherbrooke Univ., Que., Canada

Volume

1

fYear

1996

fDate

7-10 May 1996

Firstpage

204

Abstract

This paper presents an algorithm for encoding speech signals at bit rates below 4 kbit/s based on a mixed harmonic and stochastic modeling of the excitation signal. The algorithm uses robust pitch tracking and efficient voicing analysis to determine the ratios of the harmonic and stochastic components. The harmonic component is synthesized using a bank of bandpass filters while the stochastic component is synthesized using inverse STFT with overlap-and-add. Postfiltering is utilized at the decoder to enhance the quality of synthesized speech. A 2.4 kbit/s version of the algorithm was formally tested and the DAM and DRT scores showed that the coder performance is comparable to that of DoD 4.8 kbit/s Federal Standard FS-1016

Keywords

Fourier transforms; band-pass filters; harmonic analysis; linear predictive coding; speech coding; speech processing; speech synthesis; stochastic processes; 2.4 kbit/s; 4 kbit/s; DAM score; DRT score; HSX algorithm; bandpass filters; efficient voicing analysis; harmonic-stochastic excitation; inverse STFT; low bit rate; overlap-and-add; postfiltering; robust pitch tracking; speech coding; synthesized speech quality; Algorithm design and analysis; Bit rate; Encoding; Harmonic analysis; Power harmonic filters; Robustness; Signal synthesis; Speech coding; Speech synthesis; Stochastic processes;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1996. ICASSP-96. Conference Proceedings., 1996 IEEE International Conference on

Conference_Location

Atlanta, GA

ISSN

1520-6149

Print_ISBN

0-7803-3192-3

Type

conf

DOI

10.1109/ICASSP.1996.540326

Filename

540326