Active noise control using blocked mode approach

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path

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381 717, H03B 2900

Patent

active

060319178

ABSTRACT:
A method and apparatus for reducing noise across a broadband frequency range transmitted by a vibrating panel by blocking or otherwise opposing increasing non-resonant modes of vibration in the panel. The method and apparatus includes mounting an array of sensors on a surface of the vibrating panel. The sensors generate an input signal representing the incident vibration in the panel. The input signal is sent to an adaptive controller which generates an output signal. The output signal is essentially equivalent to the input signal but opposing in phase. The output signal is then sent and distributed to an array of actuators which are also mounted to a surface of the vibrating panel. The output signal forces each of the vibrating actuators to vibrate the panel in opposition to the incident vibration in the panel and thus reduce the transmitted noise. Continual readings of the vibration in the panel allows the sensors to update the input signal and thus adjust the vibration of the actuators. This approach requires only a simple adaptive controller to actively control broadband noise transmitted through the panel.

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Heard: Headphones Do Away With Aircraft Noise, by Greg Miller, Times Staff Writer, Los Angeles Times, Jun. 17, 1996.
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