DocumentCode :
930197
Title :
New fidelity criteria for discrete-time source encoding
Author :
Rickard, John T.
Volume :
25
Issue :
3
fYear :
1979
fDate :
5/1/1979 12:00:00 AM
Firstpage :
275
Lastpage :
282
Abstract :
A probabilistic approach to the source encoding problem requires the specification of a fidelity criterion which measures the degradation of the source output produced by the encoding transformation. Historically, the fidelity criteria generated by difference-type distortion measures have received by far the widest acceptance, due in part to their analytical tractability. Two new fidelity criteria for discrete.time sources are introduced. These are designated as the "mean incoherence" (MIC) and the "mean lng-coherence" (MLC). Both criteria are functionals of the magnitude-squared coherence between the source output and its reproduction, and thus do not admit a recognizable time-domain distortion measure representation. Interesting features of these fidelity criteria are indicated, and comparisons are made with the classical mean-squared error (MSE) fidelity criterion. The rate-distortion functions for a stationary Gaussian source subject to constraints on either the MIC or MLC are derived, and the corresponding optimum encoder behavior is described. Finally, the applications where these new fidelity criteria may he advantageous over the MSE criterion are discussed.
Keywords :
Rate-distortion theory; Source coding; Acoustic distortion; Books; Data compression; Degradation; Distortion measurement; Encoding; Microwave integrated circuits; Rate-distortion; Sea measurements; Time domain analysis;
fLanguage :
English
Journal_Title :
Information Theory, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9448
Type :
jour
DOI :
10.1109/TIT.1979.1056051
Filename :
1056051
Link To Document :
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