System, method, and non-transitory computer readable medium storing a program utilizing a postfilter for filtering a prefiltered audio signal in a decoder
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United States of America Patent
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Oct 15, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jul 26, 2017
filing date -
May 12, 2006
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Abstract
A very coarse quantization exceeding the measure determined by the masking threshold without or only very little quality losses is enabled by quantizing not immediately the prefiltered signal, but a prediction error obtained by forward-adaptive prediction of the prefiltered signal. Due to the forward adaptivity, the quantizing error has no negative effect on the prediction on the decoder side.
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