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
收藏
页码：147 / 150
页数：4
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