| 冯通,陈华,冯海泓.基于多采样率的频域倍频程研究[J].声学技术,2011,(3):289~293 |
| 基于多采样率的频域倍频程研究 |
| Research on multi-rate spectrum in octave analysis |
| 投稿时间：2010-11-04 修订日期：2011-02-05 |
| DOI： |
| 中文关键词: 倍频程(octave) 带通滤波器组(bandpass filter bank) 多采样率(multi-rate) 快速傅里叶变换(FFT) |
| 英文关键词: octave multi-rate bandpass filter bank FFT |
| 基金项目: |
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| 摘要点击次数: 1360 |
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| 中文摘要: |
| 传统倍频程分析采用带通滤波器组算法实现,带通滤波器组算法仅能满足国家标准要求,并且用于分析分数阶倍频程时,滤波器组的数量及计算量成倍增长.提出了一种基于多采样率在频域分析倍频程及分数阶倍频程的算法.该算法首先对信号按通道重采样,并利用FFT转换到频域计算信号的倍频程及分数阶倍频程谱.仿真验证了算法的正确性,并与带通滤波器组算法做了比较.仿真及对比结果表明,相比于带通滤波器组算法,该算法能提供更好的谱分辨率,并且对于分数阶倍频程,该算法计算量明显少于滤波器组算法计算量. |
| 英文摘要: |
| The bandpass filter bank(BFB) is commonly used for octave analysis,which meets the national standard of octave-band and fractional-octave-band.And it is known that the number of filters and the amount of computation are greatly increased for fractional octave analysis.In this paper a multi-rate spectrum alogrithm is presented,and re-sampling and FFT theory are used to compute energy.A comparison is made between multi-rate spectrum method and BFB.It is shown by tests that the multi-rate spectrum algorithm has better resolution and less computation than the BFB method. |
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