摘要
人类听觉系统利用双耳信号的时间差和强度差进行声源定位。对于机械振动信号，难以利用声源定位的方法进行振源定位，但可以参照听觉系统的工作机理对两路信号进行特征提取。以轴心轨迹为分析对象，提出了一种双耳听觉模型，该模型由两个相同的单耳模型构成，按工作顺序，单耳模型包括基底膜模型、内毛细胞模型和侧抑制模块三个主要部分。两路信号分别由两单耳模型处理后，统计两单耳模型输出信号在各频段上的时间差和强度差，并作为双耳听觉模型的最终输出。利用所建模型分析了五种不同形状的轴心轨迹，所得的时间差和相位差对于不同轴心轨迹具有良好的可区分性，且在保证特征信息冗余性的前提下，数据量适于进行智能识别。同时，试验验证的结果也表明双耳听觉模型具有一定的表征和提取微弱信号的能力。
Abstract
Using the cues of interaural time differences (ITD) and interaural intensity differences (IID), the humans auditory system implements sound source orientation. Of course, it is difficult for mechanical vibration signal to recognize the location of source. However, the mechanism of auditory system can be simulated to extract the features from two channels signals. To analysis shaft orbit, a binaural auditory model is proposed which consists of two same monaural auditory model. In each monaural auditory model, a signal is processed by basilar model, inner cells model and lateral inhibitory model in turn. The outputs of binaural auditory model, ITD and IID are calculated on the basis of the output of two monaural auditory model. Five different shaft orbit are analyzed by proposed model, the results show that the ITD and IID are different for different shaft orbit, and the data quantity can ensure redundancy of features information and is suitable for intelligent recognition. In addition, the experiments results show that the binaural auditory model has ability to indicate weak signal components.
关键词
听觉模型 /
轴心轨迹 /
故障诊断 /
特征提取
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Key words
auditory model /
shaft orbit /
faults diagnosis /
features extraction
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李允公; 戴 丽; 张金萍 .
一种双耳听觉模型及其在轴心轨迹分析中的应用[J]. 振动与冲击, 2012, 31(18): 46-49
LI Yungong;DAI Li;ZHANG Jinping .
A Binaural auditory model and its application to shaft orbit analysis[J]. Journal of Vibration and Shock, 2012, 31(18): 46-49
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