A speech coder based on decomposition of characteristic waveforms

Author

Kleijn, W. Bastiaan ; Haagen, Jesper

Author_Institution

Lab. of Inf. Principles Res., AT&T Bell Labs., Murray Hill, NJ, USA

Volume

1

fYear

1995

fDate

9-12 May 1995

Firstpage

508

Abstract

For low-rate speech coding it is advantageous to represent the speech signal as an evolving characteristic waveform (CW). The CW evolves slowly when the speech signal is clearly voiced and rapidly when the speech signal is clearly unvoiced. The voiced (periodic) and unvoiced (nonperiodic) components of the speech signal can be separated by a simple nonadaptive filter in the CW domain. Because of perceptual effects, a significant increase in coding efficiency is obtained by coding these two components separately. A 2.4 kb/s coder using these principles was developed. In an independent evaluation, the performance of the 2.4 kb/s waveform interpolation (WI) coder was found to be at least equivalent to the 4.8 kb/s FS1016 standard for all of the many tests

Keywords

interpolation; speech coding; 2.4 kbit/s; 4.8 kbit/s; characteristic waveforms decomposition; coding efficiency; low bit rate speech coding; nonadaptive filter; nonperiodic components; perceptual effects; periodic components; speech coder; speech signal; unvoiced components; voiced components; waveform interpolation method; Bit rate; Code standards; Filters; Interpolation; Laboratories; Quantization; Sampling methods; Shape; Speech coding; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on

Conference_Location

Detroit, MI

ISSN

1520-6149

Print_ISBN

0-7803-2431-5

Type

conf

DOI

10.1109/ICASSP.1995.479640

Filename

479640