Method for searching fixed codebook based upon global pulse replacement
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United States of America Patent
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Jun 15, 2010
Grant Date -
Sep 30, 2004
app pub date -
Dec 17, 2003
filing date -
Mar 25, 2003
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Abstract
The present research can decrease the amount of computation and enhance speech quality by using a global pulse replacement method in a fixed codebook search. The fixed codebook search method in a speech encoder based upon global pulse replacement, includes the steps of: (a) computing absolute values of the pulse-position likelihood-estimator vectors; (b) temporarily obtaining a codebook vector; (c) computing a mathematical equation by replacing a pulse; (d) determining whether a value computed based upon the mathematical equation is increased after pulse replacement; (e) obtaining a new codebook vector by replacing the pulse; and (f) maintaining a previous codebook vector.
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