Acoustics – Sound-modifying means – By wave interference
Reexamination Certificate
2009-06-01
2010-12-21
San Martin, Edgardo (Department: 2832)
Acoustics
Sound-modifying means
By wave interference
C181S207000, C181S208000, C381S071200
Reexamination Certificate
active
07854295
ABSTRACT:
An active noise control apparatus and an active noise control system for reducing noise using an active vibrator, such that edges β of the vibrator (i.e. genesis locations of a bending moment of force caused by the vibrator) agree with positions α on a distribution of the bending moment of force caused by noise vibration of a panel, and such that the edges β of the vibrator are aligned with the positions α on the panel where a sign, of the distribution of the bending moment of force over the panel caused by the noise vibration, reverses. As a result, a control vibration approximate to the noise vibration can be excited. Accordingly, when the vibrator is fixed by agreeing the edges β of the vibrator with the positions α determined by noise frequency desired to be reduced, noise due to a target noise frequency can be effectively reduced.
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Martin Edgardo San
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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