When Optimal Entropy-Constrained Quantizers Have Only A Finite Number of Codewords
- Bradley J. Betts ,
- Philip A. Chou
Int'l Symp. on Information Theory |
Published by Institute of Electrical and Electronics Engineers, Inc.
An entropy-constrained quantizer Q is optimal if it minimizes the expected distortion Ed(X, Q(X)) subject to a constraint on the output entropy H(Q(X)). In general, such an optimal entropy-constrained quantizer may have a countably infinite number of codewords. In this short paper, we show that if the tails of the distribution of X are sufficiently light (with respect to the distortion measure), then the optimal entropy-constrained quantizer has only a finite number of codewords. In particular, for the squared error distortion measure, if the tails of the distribution of X are lighter than the tails of a Gaussian distribution, then the optimal entropy-constrained quantizer has only a finite number of codewords.
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