| 摘要 |
PROBLEM TO BE SOLVED: To reduce vibration of a vibrating plate at a first place, vibration of the vibrating plate at a second place, and vibration of the vibrating plate at the set place of a sound detecting means. SOLUTION: In a noise reduction system, a first vibrating source and a second vibrating source are driven, so that a first detecting signal output from a first vibration detecting means installed at the first place of the vibrating plate, a second detecting signal output from a second vibration detecting means installed at the second place of the vibrating plate, and a third detecting signal output from the sound detecting means are the minimum. COPYRIGHT: (C)2004,JPO
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