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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 new method of synthetically analyzing low-order subharmonic distortion and high-order subharmonic distortion in loudspeaker response is proposed to realize the rapid detection of abnormal speaker noise. The article analyzes the time-domain and frequency-domain features of the abnormal speaker sound, and discusses the mechanism of hearing abnormal sound in the human ear. By modeling the speaker system Volterra and selecting continuous logarithmic sweep signal as the excitation signal, the response expression of this model under this excitation is deduced.The expression reveals the method of extracting the impulse response of every order, A tracking filter that can quickly extract harmonic distortion of every order is given to detect abnormal speaker noise. Laboratory tests and multiple factory production line tests initially verify the accuracy, speed and feasibility of the method.