Layered celp system and method with varying perceptual filter or short-term postfilter strengths
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United States of America Patent
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Oct 20, 2009
Grant Date -
Aug 8, 2002
app pub date -
Nov 13, 2001
filing date -
Nov 15, 2000
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Abstract
Layered code-excited linear prediction (CELP) speech encoders have progressively weaker perceptual weighting filters for each of the successive enhancement layers and decoders have progressively weaker short-term postfilters for increased bit rates (increased number of enhancement layers decoded) and a long-term postfilter for all bit rates.
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