DocumentCode :
768900
Title :
Sequential Adaptive Predictors for ADPCM Speech Encoders
Author :
Xydeas, C.S. ; Evci, C.C. ; Steele, R.
Author_Institution :
Loughborough Univ., Loughborough, England
Volume :
30
Issue :
8
fYear :
1982
fDate :
8/1/1982 12:00:00 AM
Firstpage :
1942
Lastpage :
1954
Abstract :
The sequential gradient estimation predictor is compared in detail to the stochastic approximation predictor, and both are evaluated in an ADPCM codec. A switched predictor having two coefficients is then described for use in a DPCM-AQF codec. This predictor divides the range of the correlation coefficient of the speech signal into zones, and as the correlation coefficient changes zones, the predictor coefficients undergo a substantial modification. By this method the adaptation rate of the predictor is improved, particularly during transitions between unvoiced and voiced sounds.
Keywords :
DPCM communication; Sequential estimation; Speech coding; Stochastic approximation; Buffer storage; Codecs; Electrons; Frequency division multiaccess; Modulation coding; Pulse modulation; Signal to noise ratio; Speech; Stochastic processes; Time division multiple access;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1982.1095669
Filename :
1095669
Link To Document :
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