Title :
A low delay 16 kbits/sec speech coder
Author :
Iyengar, V. ; Kabal, P.
Author_Institution :
McGill Univ., Montreal, Que., Canada
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;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Conference_Location :
New York, NY
DOI :
10.1109/ICASSP.1988.196560
