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PSYCHOACOUSTIC FILTER DESIGN FOR RATIONAL RESAMPLERS
PSYCHOACOUSTIC FILTER DESIGN FOR RATIONAL RESAMPLERS
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机译:有理再采样器的心理滤波器设计
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摘要
The present document relates to the design of anti-aliasing and/or anti-imaging filters for resamplers using rational resampling factors. In particular, the present document relates to a method for designing such filters having a reduced number of filter coefficients or an increased perceptual performance, as well as to the filters designed using such method. A method for designing a filter (102) configured to reduce imaging and/or aliasing of an output audio signal (113) at an output sampling rate (fsout) is described. The output audio signal (113) is a resampled version of an input audio signal (110) at an input sampling rate (fsin). The ratio of the output sampling rate (fsout) and the input sampling rate (fsin) is a rational number N/M. The filter (102) operates at an upsampled sampling rate which equals N times the input sampling rate (fsin). The method comprises the steps of selecting an allowed deviation of the frequency response (531, 532) of the filter (102) within a stop band of the filter (102) based on a perceptual frequency response indicative of an auditory spectral sensitivity; wherein the allowed deviation indicates a deviation of the frequency response (531, 532) of the filter (102) from a predetermined attenuation within the stop band; and of determining coefficients of the filter (102) such that the frequency response (531, 532) of the filter (102) is fitted to the allowed deviation of the frequency response (531, 532).
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机译:本文件涉及使用合理的重采样因子的用于重采样器的抗混叠和/或抗成像滤波器的设计。特别地,本文件涉及一种用于设计具有减少的滤波器系数数量或增加的感知性能的滤波器的方法,并且涉及使用这种方法设计的滤波器。描述了一种用于设计滤波器(102)的方法,该滤波器被配置为以输出采样率(fs out Sub>)减少输出音频信号(113)的成像和/或混叠。输出音频信号(113)是以输入采样率(fs in Sub>)的输入音频信号(110)的重采样版本。输出采样率(fs out Sub>)与输入采样率(fs in Sub>)之比为有理数N / M。滤波器(102)以等于输入采样率(fs in Sub>)的N倍的上采样采样率工作。该方法包括以下步骤:基于指示听觉频谱灵敏度的感知频率响应,选择滤波器(102)的阻带内的滤波器(102)的频率响应(531、532)的允许偏差;其中允许偏差表示滤波器(102)的频率响应(531、532)与阻带内的预定衰减的偏差;确定滤波器(102)的系数,以使滤波器(102)的频率响应(531、532)适合于频率响应(531、532)的允许偏差。
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