扬声器异常音的快速检测方法及其实验研究

提出了一种对扬声器声响应中的低阶次谐波失真与高阶次谐波失真和进行综合分析的方法,以实现对扬声器异常音的快速检测。文章分析了扬声器异常音的时域和频域特征,并对人耳听测异常音的机理进行了讨论。通过对扬声器系统Volterra建模并选择连续对数扫频信号作为激励信号,推导出了该模型在此激励下的响应表达式.该表达式揭示了提取各阶冲激响应的方法,由该表达式给出一种可以快速提取各阶次谐波失真的跟踪滤波器,以实现对扬声器异常音的检测。实验室测试和多次工厂生产线测试初步验证了该方法的准确性、快速性和可行性。 

A fast method with experiment for loudspeaker defects detection

A combine usage of both measuring the low order harmonic distortion and the sum of high order harmonic distortion in the loudspeaker acoustics response for defect detection is presented in this paper.Based on the analysis of the time domain and frequency domain characteristics of the defect loudspeaker samples and learning from the ability of human hearing,an external principle of the defect measurement is firstly proposed.Secondly,according to modeling the nonlinear system in Volterra series,stimulating the continue logarithmic sweep signal,deducing the response of the test system under these conditions,a fast algorithm is proposed to realize the high-pass and band-pass tracking filter the acoustic signal,and fulfill the detecting of the loudspeaker defects.Not only the validity and feasibility of this method,but also the efficiency was proved by the results of both lab experiment and several factory tests.