Noise shaping filter design for minimally audible signal requantization

被引：5

作者：

Verhelst, W ^{[1
]}

De Koning, D ^{[1
]}

机构：

[1] Katholieke Univ Leuven, ESAT PSI, B-3001 Heverlee, Belgium

来源：

PROCEEDINGS OF THE 2001 IEEE WORKSHOP ON THE APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS | 2001年

关键词：

D O I：

10.1109/ASPAA.2001.969564

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Signal requantization to reduce the word-length of an audio stream introduces distortions. Noise shaping can be applied in combination with a psycho-acoustic model in order to make requantization distortions minimally audible. The psycho-acoustically optimal noise shaping curve depends on the time-varying characteristics of the input signal. Therefore, the noise shaping filter coefficients are to be computed and updated on a regular basis. In this paper, we show that the optimal coefficients can be obtained by solving a simple least squares problem. Thus, an efficient scheme for minimally audible requantization can be proposed in which the noise shaping coefficients are computed from the psycho-acoustic masking curve by solving a linear matrix equation.

引用

页码：147 / 150

页数：4

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