| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform vibration analysis in real time using a discrete wavelet transformation tree and a parasitic filter. <P>SOLUTION: Vibration sensors 7a-7d are provided at a plurality of candidate points of an in-vehicle unit, a microphone 6 is installed at a measuring point, a real-signal mother wavelet is composed of noise signals measured by the microphone 6, and a discrete wavelet transformation tree is prepared. A parasitic filter is designed which is connected to a desired decomposition filter of the tree and has such a structure that, when discrete wavelet transformation is executed using the real-signal mother wavelet as input to the tree, the inputted real-signal mother wavelet is reproduced and outputted practically. Vibration signals detected by the vibration sensors 7a-7d are inputted to the discrete wavelet transformation tree and on the basis of instantaneous correlation values outputted from the parasitic filter, a vibration signal with the highest instantaneous correlation value is specified, thereby identifying a generation source of vibration from among the plurality of candidate points of the in-vehicle unit. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
