基于短时傅里叶变换的异常音检测方法 - 声学技术.PDF

第 33 卷第 2 期 声 学 技 术 Vol.33, No.2 2014 年 04 月 Technical Acoustics Apr., 2014 基于短时傅里叶变换的异常音检测方法 1 1,2 1,2 李宏斌 ，徐楚林 ，温周斌 (1. 中国科学院声学研究所东海研究站，上海 200032 ；2. 浙江中科电声研发中心，浙江嘉善 314100) 摘要：提出一种基于短时傅里叶变换的扬声器异常音检测方法，该方法首先对由扫频信号激励的扬声器声响应信号 进行短时傅里叶变换，然后根据扬声器异常音信号的特点将所获得的时频图分割为若干区域，并提取各个区域内的 时频图所对应的矩阵，最后通过计算被测扬声器声响应信号所对应区域内的矩阵与黄金样品所对应的矩阵之间的距 离来判断该扬声器是否存在异常音。还简要介绍了基于该方法实现的扬声器异常音在线检测仪，实验室及企业生产 线初步检验结果表明，该方法简单有效，可用于部分种类扬声器的异常音在线检测。 关键字：扬声器；异常音；短时傅里叶变换；时频图 中图分类号：TB54 文献标识码：A 文章编号：1000-3630(2014)-02-0145-05 DOI 编码：10.3969/j.issn1000-3630.2014.02.010 A STFT based method for detecting Rub Buzz defects of loudspeaker and its application research 1 1,2 1,2 LI Hong-bin , XU Chu-lin , WEN Zhou-bin (1. Shanghai Acoustics Laboratory, Institute of Acoustics, Chinese Academy of Sciences, Shanghai 200032, China; 2. Zhejiang Electro-Acoustic RD Center, Chinese Academy of Sciences, Jianshan 314115, Zhejiang, China) Abstract: This paper presents a new method of Rub Buzz detection for loudspeakers based on Short-Time Fourier Transform(STFT), which is performed as follows: Firstly, the one-dimensional sound signal, which is stimulated by a swept sinusoidal signal, is changed into a two-dimensional time-frequency map; Secondly, the time-frequency map is divided into several segments according to the irregular signals (Rub Buzz) characteristics and the corresponding matrix is extracted in each segment; Thirdly, the distances between each matrix and each standard matrix which is ex- tracted from Golden Units are calculated. By comparing the dista