CPB的计算方法
如何从一个时间信号中计算出CPB来？是先做FFT再做滤波，还是其它办法？ 应该是先滤波。fft是等带宽分析，与cpb作用不同。 一种新的倍频程CPB谱实现方法
A Novel Algorithm for Octave CPB Spectrum Analysis
<<仪器仪表学报 >>2001年05期
汪乐宇 , 陈耀武
基于FFT的倍频程CPB谱实现算法中,由于FFT变换时频谱泄漏的影响,导致倍频程CPB谱许多频段出现较大的计算误差.特别是低频段部分,因为谱线数太少,会造成更大的计算误差.为克服上述基于FFT的CPB谱实现算法的不足,本文提出了一种基于子波变换的倍频程CPB谱的实现方法,该方法有效地提高了倍频程CPB谱各频段的计算精度.文中详细介绍实现原理,并对实例计算结果进行了分析.
关键词： CPB谱 子波交换 Title:
A constant percentage bandwidth transform for acoustic signal processing
Authors:
Youngberg, J. E.
Affiliation:
Utah Univ., Salt Lake City.
Publication:
Ph.D. Thesis Utah Univ., Salt Lake City.
Publication Date:
00/1979
Category:
Communications and Radar
Origin:
STI
NASA/STI Keywords:
ACOUSTICS, BANDWIDTH, SIGNAL PROCESSING, TRANSFORMATIONS (MATHEMATICS), AUDITORY PERCEPTION, SPECTROGRAMS, SPECTRUM ANALYSIS, SPEECH
Bibliographic Code:
1979PhDT........15Y
Abstract
A constant percentage bandwidth transform for acoustic signal processing is presented. Such a transform was shown to emulate behavior found in the human auditory system, making possible both the imitation or peripheral auditory analysis, and processing which was more closely linked to perception than is possible using constant bandwidth analysis. A synthesis transformation is developed to enable such processing. Various properties of the transform pair are derived, and a filterbank analogy is used to create a basis for intuitive understanding of the transform's operation and properties. The effects of spectral domain modification are described and shown to be related to the properties of the analysis window function. Principles governing discrete implementation of the transform pair are discussed, and relationships are formalized which specify the sampling of the spectral domain.
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