基于VMD的声音信号增强算法研究

doi:10.3901/JME.2018.10.010

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 10-15.doi: 10.3901/JME.2018.10.010

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基于VMD的声音信号增强算法研究

路敬祎^1,2, 马雯萍², 叶东¹, 姜春雷^1,2

1. 哈尔滨工业大学电气工程及自动化学院哈尔滨 150001;
2. 东北石油大学电气信息工程学院大庆 163318

收稿日期:2017-07-02 修回日期:2018-01-05 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 叶东(通信作者),男,1968年出生,博士,教授,博士研究生导师。主要从事基于串/并联结构的坐标测量理论和技术、双目/单目视觉坐标测量理论和技术等研究。E-mail:yedong@hit.edu.cn
作者简介:路敬祎,男,1977年出生,博士研究生,副教授,硕士研究生导师。主要从事信号检测和声学信号处理方面的研究工作。E-mail:lujingyi@hit.edu.cn
基金资助:
国家自然科学基金（51075095）、东北石油大学培育基金和东北石油大学研究生创新科研（YJSCX2017-027NEPU）资助项目。

Algorithm of Sound Signal Enhancement Based on VMD

LU Jingyi^1,2, MA Wenping², YE Dong¹, JIANG Chunlei^1,2

1. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001;
2. Faculty of Electricity and Information Engineering, North East Petroleum University, Daqing 163318

Received:2017-07-02 Revised:2018-01-05 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

摘要： 为提高声音信号增强效果，减小实际信号的计算量，利用可变模态分解（Variational mode decomposition，VMD）与相关系数以及能量的起始点检测准则相结合提出一种新的信号增强算法。该算法首先利用能量的起始点检测准则判断出实际信号的起始点提取有效信号；利用VMD分解该信号，计算分解后各本征模态函数（Intrinsic mode function，IMF）与原始信号的相关系数；利用预设的相关系数阈值来自适应确定有效IMF，利用有效的IMF重构信号。为了评估该算法的增强效果，利用该算法与经验模态分解（Empirical mode decomposition，EMD）算法进行对比分析。理论分析和试验结果表明：提出的算法在相同信噪比不同采样频率以及不同输入信噪比的条件下获得的输出信噪比都高于EMD算法，从而验证了该算法的稳定性和准确性。

关键词: EMD, VMD, 滤波, 相关系数, 信号增强

Abstract: In order to improve the signal enhancement effect and reduce the calculation of the actual signal, a new signal enhancement algorithm is proposed by combining the variational mode decomposition(VMD) with the correlation coefficient and the starting point detection criterion of energy. The algorithm uses the starting point detection criterion of energy to judge the starting point of the actual signal to extract the effective signal. Then, the VMD is used to decompose the signal to calculate the correlation coefficient of the intrinsic mode function(IMF) and the effective signal. It extracts useful IMFs by defaulting the correlation coefficient threshold, and reconstructs the filtering signal using the useful IMFs. In order to evaluate the enhancement effect of the algorithm, the algorithm is compared with the empirical mode decomposition(EMD) algorithm. The theoretical analysis and experimental results show that the proposed algorithm has higher output signal to noise ratio than the EMD algorithm under different sampling frequency and different input signal-to-noise ratio, which verifies the stability and accuracy of the algorithm.

Key words: correlation coefficient, EMD, filter, signal enhancement, VMD

中图分类号:

O42
TB52

路敬祎, 马雯萍, 叶东, 姜春雷. 基于VMD的声音信号增强算法研究[J]. 机械工程学报, 2018, 54(10): 10-15.

LU Jingyi, MA Wenping, YE Dong, JIANG Chunlei. Algorithm of Sound Signal Enhancement Based on VMD[J]. Journal of Mechanical Engineering, 2018, 54(10): 10-15.

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基于VMD的声音信号增强算法研究

Algorithm of Sound Signal Enhancement Based on VMD

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