A method for detecting rub and buzz defects of loudspeaker in time domain
WEI Jun-feng 1,2; YANG Yi 1,2; WEN Zhou-bin1,2; FENG Hai-hong1,2
1. Shanghai Acoustics Lab, Institute of Acoustics, Chinese Academic of Sciences, Shanghai 200032， China；2. Jiaxing Engineering Center, Institute of Acoustics, Chinese Academic of Sciences, Zhejiang, 314006， China
Abstract：A method which can be used for detecting Rub and Buzz defects in time domain is presented. Empirical Mode Decomposition of sound response signal is performed and aliasing parts in Intrinsic Mode Functions (IMFs) are removed by referencing the difference between stimulus and IMFs. Vibration modes, which are caused by Rub and Buzz defects, are extracted and be used for fault detection. The validation was composed of simulation and measurement of defective samples. In the simulation, constructed sound responses representing quality and fault products were analyzed. Simulated symptoms from rubbing, buzzing and loose particles problems were detected. In the measurement validation, IMFs and high-order harmonic distortions (HOD) of sound responses from 20 samples were measured and analyzed. The results show that the frequencies and amplitude characteristics of defects are concordant with the results by HOD method. Furthermore, according to the type of defects, different time-domain features can be found in local features of IMFs.
韦峻峰;;杨益;;温周斌;;冯海泓;. 一种扬声器异常音的时域特征检测方法[J]. , 2011, 30(10): 122-128.
WEI Jun-feng;YANG Yi;WEN Zhou-bin;FENG Hai-hong;. A method for detecting rub and buzz defects of loudspeaker in time domain. , 2011, 30(10): 122-128.
2011, Vol. 30 
