杨益;韦峻峰;温周斌;冯海泓;

• 1:中国科学院声学研究所东海研究站
• 2:中国科学院声学研究所嘉兴工程中心

摘要：

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。

关键词：

Abstract: 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.

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参考文献：

• 1 Pascal Brunet,Evan Chakroff,Steve Temme.Loose particle detection in loudspeakers.In:115th Convention of the AES,New York, USA,2003:5883
• 2 Temme Steve,Brunet Pascal.Enhancements for loose particle detection in loudspeakers.In:116th Convention of the AES,Berlin, Germany,2004:6164
• 3 Leonhard Frank Uldall.Method and system for detecting and generating transient conditions in auditory signals.US 5,884,260,19, 1999
• 4 Irrgang Stefan,Klippel Wolfgang,Seidel Ulf.Loudspeaker testing at the production line.In:120th Convention of the AES,Paris,France, 2006:6845
• 5 Shane Thompson,Anthony Pagliaro,Robert Celmer.Higher order harmonic signature analysis for loudspeaker defect detection.J. Acoust.Soc.Am.,2003;114(4):2400-2400
• 6王思俊,许增朴,于德敏等.基于支持向量机的扬声器故障检测方法.电声技术,2008;32(3):26-29
• 7 Steve Temme,Pascal Brunet,D.B.Keele Jr.Practical measurement of loudspeaker distortion using a simplified auditory perceptual model.In:127th Convention of the AES,New York,USA, 2009:7905
• 8 Klippel W.Loudspeaker Nonlinearities- Causes,Parameters, Sysmptoms.J Audio.Eng.Soc.,2006;54(10):901-939
• 9魏荣爵,陶擎天.直接辐射式扬声器的非线性研究.电声技术, 1986;10(4):1-4
• 10 Volterra V.Theory of functionals and of integral and integro-differential equations.Dover,New-York,1958
• 11 Wiener N.Non linear problems in random theory.MIT Press,Cambridge, MA,1958
• 12 Temme Steve,Brunet Pascal.A new method for measuring distortion using a multitone stimulus and noncoherence.J.Audio Eng. Soc.,2008;56(3):176-188
• 13 S Boyd,Y S Tang,L O Chua.Measuring Volterra Kernels.IEEE Transactions on Circuits and Systems,1983;30(8):571-577
• 14 Schoukens J,Pintelon R M,Rolain Y J.Broadband versus stepped sine FRF measurements.Instrumentation and Measurement,IEEE Transactions,2000;49(2):275-278
• 15 Farina A.Simultaneous measurement of impulse response and distortion with a swept-sine technique.J.Audio Eng.Soc.,2000;48: 350
• 16 Shetzen M.The volterra & wiener theories of nonlinear systems. John Wiley,New York,1980:59-61
• 17 IEC 60268-5.Sound system equipment-Part 5:Loudspeaker. 2003