DocumentCode
767771
Title
Adaptivity Versus Tree Searching in DPCM
Author
Chan, H.C. ; Anderson, J.B.
Author_Institution
Government of Canada, Ottawa, Canada
Volume
30
Issue
5
fYear
1982
fDate
5/1/1982 12:00:00 AM
Firstpage
1254
Lastpage
1259
Abstract
The interaction is studied between the effects of tree searching and predictor and quantizer adaptation in a differential pulse-code modulation (DPCM) speech digitizer. The maximum entropy method computes a new source model every 8 ms, and a variety of strategies are used to adapt the quantizer. Results are displayed in plots of local SNR versus time. It is found that the predictor, the quantizer, and the tree search each contribute roughly independently to the total SNR. Adaptivity contributes in total 6-7 dB and tree searching 2-3 dB.
Keywords
pulse code modulation; speech analysis and processing; trees (mathematics); SNR; differential pulse-code modulation; maximum entropy method; predictor; quantizer adaptation; speech digitizer; tree searching; Books; Decision trees; Delay; Digital modulation; Entropy; Gain; Least squares approximation; Mean square error methods; Pulse modulation; Speech coding;
fLanguage
English
Journal_Title
Communications, IEEE Transactions on
Publisher
ieee
ISSN
0090-6778
Type
jour
DOI
10.1109/TCOM.1982.1095571
Filename
1095571
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