| 摘要 |
PROBLEM TO BE SOLVED: To provide an active noise reduction device and system which can achieve an advantageous sound insulation effect over a wide frequency range without increasing the size of the apparatus. SOLUTION: Edge partsβof a vibrator 10, that is, genesis locationsβof a bending moment force by the vibrator 10, agree with positionsαwhere a sign of the bending moment force distribution of a panel 40 by noise vibration changes. As a result, control vibration approximate to the noise vibration can be excited. Accordingly, when the vibrator 10 is fixed by agreeing the edgesβof the vibrator 10 with the positionsαof the panel 40 determined by noise frequency desired to be reduced, noise due to a target noise frequency can be effectively reduced. COPYRIGHT: (C)2010,JPO&INPIT
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