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On the optimality of block orthogonal transforms for multiple description coding of Gaussian vector sources

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2 Author(s)
Pradhan, S.S. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; Ramchandran, K.

In this work, we consider the application of unitary filter banks for multiple description coding of independent, identically distributed Gaussian vector sources. We derive the redundancy-rate-distortion bound for this class of signals. It is shown that for two-dimensional (2-D) Gaussian vector sources (resulting in a two-description system), 2/spl times/2 block transforms give all the achievable optimal points in the redundancy-rate-distortion function among the class of all unitary filter banks. Similar results can be obtained for higher-dimensional transforms.

Published in:

Signal Processing Letters, IEEE  (Volume:7 ,  Issue: 4 )