| 摘要 |
PROBLEM TO BE SOLVED: To accurately analyze a degree of contribution of each sound source even in the presence of vibration noise and fluid noise mixed together by inputting sound and vibration detection signals detected in the vicinity of a vibration source into adaptive filters(ADF) individually. SOLUTION: This method is intended for finding contribution of noise based on vibration and fluid in a certain evaluation point to an object in which noise is generated because of two factors, that is, a vibration factor and a fluid factor. That is, when it seems that noise from respective vibration sources is mixed in a sound sensor installed in the vicinity of a sound source, a sound detection signal and a vibration detection signal detected in the vicinity of the vibration source are inputted to adaptive filters(ADF) 130a-130c respectively, and the sum of the output signals from the respective ADF 130a-130c is found. Cofactors for the ADF 130a-130b are automatically updated so that a different between a target signal for sound/vibration detected in an evaluation point and the sum of the output signals is minimized. When the difference converges on a fixed value, a degree of contribution of the respective vibration sources can be found on the basis of the output signals from the respective ADF 130a-130c.
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