| 摘要 |
<p>Provided is a noise control device which eliminates possibility that a noise coming to a control point exceeds the level before the noise control and which can reduce the circuit size. The noise control device includes: a control noise detector which detects a predetermined coming noise and outputs a control noise signal; a control filter unit which uses a preset fixed filter coefficient to perform signal processing on the control noise signal from the control noise detector and outputs a control signal; a control speaker which radiates a control sound based on the control signal from the control filter unit toward a control point so as to reduce a predetermined noise coming to the control point; a noise judgment unit which judges whether the predetermined noise coming to the control point corresponds to the fixed filter coefficient; and an output control unit which halts the output of the control signal from the control filter unit if the noise judgment unit judges that the predetermined noise is not a noise corresponding to the fixed filter coefficient.</p> |
