Device and method for quantizing the gains of the adaptive and fixed contributions of the excitation in a CELP codec
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United States of America Patent
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Jul 7, 2015
Grant Date -
Aug 16, 2012
app pub date -
Feb 14, 2012
filing date -
Feb 15, 2011
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Abstract
A device and method for quantizing a gain of a fixed contribution of an excitation in a frame, including sub-frames, of a coded sound signal. The gain is estimated in a sub-frame using a frame classification parameter, and is then quantized in the sub-frame using the estimated gain. The device and method can be used in jointly quantizing gains of adaptive and fixed contributions of an excitation. For retrieving a quantized gain of a fixed contribution of an excitation in a sub-frame, the gain of the fixed excitation contribution is estimated using a frame classification parameter, a gain codebook supplies a correction factor in response to a received, gain codebook index, and a multiplier multiplies the estimated gain by the correction factor to provide the quantized gain.
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