A low delay 16 kbits/sec speech coder

Author

Iyengar, V. ; Kabal, P.

Author_Institution

McGill Univ., Montreal, Que., Canada

fYear

1988

fDate

11-14 Apr 1988

Firstpage

243

Abstract

The authors study a speech coder using a tree code generated by a stochastic innovations tree and backward adaptive synthesis filters. The synthesis configuration uses a cascade of two all-pole filters-a pitch (long time delay) filter followed by a formant (short time delay) filter. Both filters are updated using backward adaptation. The formant predictor is updated using an adaptive lattice algorithm. The multipath (M,L) search algorithm is used to encode the speech. A frequency weighted error measure is used to reduce the perceptual loudness of the quantization noise. The speech coder has low delay (1 ms) and has been evaluated through formal subjective testing to have speech quality that is equivalent to that for 7-bit log-PCM

Keywords

encoding; filtering and prediction theory; speech analysis and processing; 16 kbit/s; adaptive lattice algorithm; all-pole filters; backward adaptation; backward adaptive synthesis filters; formant filter; formant predictor; frequency weighted error measure; low delay coder; multipath search algorithm; perceptual loudness; pitch filter; predictive coder; quantization noise; speech coding; stochastic innovations tree; tree code; Adaptive filters; Delay effects; Frequency measurement; Lattices; Speech analysis; Speech coding; Speech synthesis; Stochastic processes; Technological innovation; Weight measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Conference_Location

New York, NY

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1988.196560

Filename

196560