Method and apparatus for fast CELP parameter mapping
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United States of America Patent
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Apr 22, 2008
Grant Date -
Sep 2, 2004
app pub date -
Oct 23, 2003
filing date -
Oct 25, 2002
priority date (Note) -
Expired
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Abstract
An apparatus and method for mapping CELP parameters between a source codec and a destination codec. The apparatus includes an LSP mapping module, an adaptive codebook mapping module coupled to the LSP mapping module, and a fixed codebook mapping module coupled to the LSP mapping module and the adaptive codebook mapping module. The LSP mapping module includes an LP overflow module and an LSP parameter modification module. The adaptive codebook mapping module includes a first pitch gain codebook. The fixed codebook mapping module includes a first target processing module, a pulse search module, a fixed codebook gain estimation module, a pulse position searching module.
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