DocumentCode
1020671
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
Volume
22
Issue
4
fYear
1986
Firstpage
220
Lastpage
221
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;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19860153
Filename
4256341
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