| 摘要 |
PURPOSE: To perform good noise reduction control and vibration reduction control by selecting the absolutely minimum reference signals out of plural signals indicating an occurrence state of noise and vibration. CONSTITUTION: A controller 20 performing noise reduction control is provided with a reference signal selecting section 21 selecting and outputting a signal being a main factor of a noise out of acceleration detecting signals Vt as a reference signal XK, a driving signal generation section 22 convoluting the reference signal XK and each filter coefficient Wkmi of a adaptive digital filter Wkm and adding them for each subscript (m) and generating and outputting a driving signal ym , an update reference signal operation section 23 operating an update reference signal rklm based on the reference signal Xk and a transfer function filter CΛlm , and a filter coefficient updating section 24 updating the filter coefficient Wkmi based on the update reference signal rklm and a residual noise signal el .
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