Method and apparatus for active sound control

Details Method and apparatus for active sound control Method and apparatus for active sound control

1982-04-13

1984-10-30

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, H04B 1500

Patent

active

044803338

ABSTRACT:
Sound control systems which employ sound cancellation may deteriorate due to ageing or change of conditions. The system described is contructed to change according to the sound level at a point where cancellation is to be achieved by sound from a loudspeaker driven by modified signals from a microphone which picks up sounds from a noise source. The signals from the microphone pass through a filter circuit having a transfer function which is controlled by a controller. Signals from the point where cancellation is required, and after modification, from the microphone and the filter circuit are employed by the controller to derive a control signal for the filter circuit.

REFERENCES:
patent: 3936606 (1976-02-01), Wanke
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4122303 (1978-10-01), Chaplin et al.
patent: 4153815 (1979-05-01), Chaplin et al.

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