Title :
Independent analysis of quantiser and predictor used in CCITT 32 kbit/s ADPCM algorithm
Author :
Araujo, A. M De Lima ; Alcaim, A. ; Marca, J. R Boisson De
Author_Institution :
CETUC-PUC/RJ Pontificia Universidade Católica, Rio de Janeiro, Brazil
Abstract :
CCITT has standardised an ADPCM coding scheme at 32 kbit/s which employs a quantiser with two speeds of adaptation and an adaptive predictor with six zeros and two poles. The letter investigates the benefits brought by the quantiser and the predictor, independently, when coding speech signals. The results are given in terms of the mean segmental signal/noise ratio, obtained in communication channels with bit error rates equal to 0, 10-4, 10-3, 10-2 and 10-1.
Keywords :
analogue-digital conversion; codecs; decoding; digital communication systems; encoding; pulse-code modulation; standardisation; vocoders; 32 kbit/s; ADPCM algorithm; CCITT; adaptive differential PCM; adaptive predictor; bit error rates; codecs; coding scheme; communication channels; decoding; digital transmission; mean segmental signal/noise ratio; quantiser; speech signals; standardisation; vocoders;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19860153
