Harmonic coding at 4.8 kb/s

Author

Marques, Jorge S. ; Almeida, Luís B. ; Tribolet, José M.

Author_Institution

INESC/IST, Lisboa, Portugal

fYear

1990

fDate

3-6 Apr 1990

Firstpage

17

Abstract

A harmonic coder designed for operation at 4.8 kb/s is presented. Sinusoidal modeling of speech is reviewed and the use of harmonically related frequencies is extended to unvoiced and transition regions. The estimation of the fundamental frequency with emphasis on the fine tuning of the pitch estimates is discussed. The structure of the 4.8-kbit/s harmonic coder is described, and a detailed discussion of phase quantization issues is presented. Experimental results are presented which reveal a reverberant character in many speech utterances and difficulties in some classes of sounds (plosives, liquids, and voiced fricatives). These distortions are mostly produced by the quantization of phase, but they are also explained by the difficulties of the sinusoidal analysis/synthesis in transition regions when the frame length is large

Keywords

bandwidth compression; encoding; speech analysis and processing; 4.8 kbit/s; classes of sounds; harmonic coder; liquids; low bit rate speech coding; phase quantization issues; plosives; reverberant character; sinusoidal modeling of speech; speech encoding; speech utterances; transition regions; unvoiced speech sounds; use of harmonically related frequencies; voiced fricatives; Bit rate; Bridges; Frequency estimation; Least squares approximation; Liquids; Phase distortion; Phase estimation; Quantization; Sampling methods; Speech coding; Speech synthesis; Tuning; Vocoders;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on

Conference_Location

Albuquerque, NM

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1990.115526

Filename

115526