Abstract
The authors review the backward filtering algorithm and give a compact proof of its validity using matrix notation. They review the relation between backward filtering and offline perceptual weighting in sparse codebook CELP and show how a combination online/offline parallel weighting algorithm can be used to reduce the search complexity of an overlapped sparse codebook by 30% to 50%.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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