| 高友丽,唐求,张军号,李斌勤.基于改进Mallat算法的倍频程分析方法研究[J].,2016,35(6):511-519 |
| 基于改进Mallat算法的倍频程分析方法研究 |
| Research for 0ctave analysis based on improved Mallat algorithm |
| 投稿时间：2016-02-25 修订日期：2016-06-05 |
| 中文摘要: |
| 倍频程分析是噪声测量系统中的重要环节，针对传统倍频程分析方法中滤波器相对衰减值测量精度不高和声压级谱测量不准确的缺陷，本文提出了一种基于改进Mallat算法的倍频程分析方法。首先介绍了Mallat算法的噪声信号倍频程分析基本原理，然后针对基于Mallat算法的倍频程分析系统中小波滤波器的非锐截止特性与卷积运算带来的边界效应所导致的误差，本文提出了改进Mallat算法：1)删除由于小波滤波器的非锐截止特性所导致的频率混淆分量；2)适当剔除输出信号的首尾端来消除卷积运算导致的边界效应，最后应用虚拟仪器软件开发平台LabVIEW搭建了基于改进Mallat算法的倍频程分析系统。仿真对比实验结果验证了改进Mallat倍频程分析方法对噪声信号的相对衰减值测量精度更高，声压级谱显示更加准确。 |
| 英文摘要: |
| Octave analysis is an important part of noise measurement system, in view of the defects of inaccurate for sound pressure level spectrum measurement and low accuracy for relative attenuation values in traditional octave analysis method, an improved Mallat algorithm is proposed in this pape. First the basic principle of noise signal octave analysis based on Mallat algorithm is introduced, then the improved Mallat algorithm which could lower the error caused by sharp cut-off characteristic of wavelet filter and boundary effect of convolution is given. The keys of the proposed algorithm are: 1) removing the frequency aliasing components due to the sharp cut-off characteristics of the wavelet filter; 2) weeding out the first end of the output signal to eliminate the boundary effect caused by convolution appropriately. At the end, the octave analysis system based on improved Mallat algorithm is simulated though LabVIEW. The simulation results show that the relative attenuation values is more precise and the display for spectrum is more accurate with the octave analysis based on improved Mallat algorithm . |
| DOI：10.11684/j.issn.1000-310X.2016.06.006 |
| 中文关键词: 改进Mallat算法，倍频程分析，相对衰减值，声压级谱 |
| 英文关键词: improved Mallat algorithm, octave analysis, relative attenuation value, sound pressure level spectrum |
| 基金项目: |
|
| 摘要点击次数: 2121 |
| 全文下载次数: 2926 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
