Method and device for efficient quantization of transform information in an embedded speech and audio codec
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United States of America Patent
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Mar 12, 2013
Grant Date -
Nov 18, 2010
app pub date -
Sep 25, 2008
filing date -
Sep 28, 2007
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Abstract
A method and device for coding an input sound signal in at least one lower layer and at least one upper layer of an embedded codec comprises, in the at least one lower layer, coding the input sound signal to produce coding parameters, wherein coding the input sound signal comprises producing a synthesized sound signal. An error signal is computed as a difference between the input sound signal and the synthesized sound signal and a spectral mask is calculated as a function of a minima of a spectrum related to the input sound signal. In the at least one upper layer, the error signal is coded to produce coding coefficients, the spectral mask is applied to the coding coefficients, and the masked coding coefficients are quantized. Applying the spectral mask to the coding coefficients reduces the quantization noise produced upon quantizing the coding coefficients.
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