Abstract
To reduce computational complexity of the Linde-Buzo-Gray (LBG) algorithm, an improved fast training method in the Hadamard domain is proposed. This method uses an optimally-ordered Hadamard transform kernel based on the statistical energy distribution of transformed training vectors in k-dimensional space and a three-step elimination criterion to more efficiently reject impossible codevectors. Experimental results demonstrate the effectiveness of the proposed method in terms of arithmetical operations and search space.
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