Electronic cancelling of acoustic traveling waves

Details Electronic cancelling of acoustic traveling waves Electronic cancelling of acoustic traveling waves

1982-07-14

1984-05-15

Pitts, Harold I.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, H04R 128

Patent

active

044492359

ABSTRACT:
An acoustic disturbance in a thin support rod may be suppressed by detecting the disturbance, and processing the detected signal with electronic circuits to generate two output signals, which are injected into the rod at spatially separate positions. It is the solution of the waveforms for the output signals that is the essence of the technique. The principal component of the electronic circuits is an integrator. There are also delay devices and summing circuits.

REFERENCES:
patent: 3602331 (1971-08-01), Bschorr
patent: 3936606 (1976-02-01), Wanke
patent: 4044203 (1977-08-01), Swinbanks
patent: 4122303 (1978-10-01), Chaplin et al.
patent: 4177874 (1979-12-01), Angelini et al.
"An Experimental Study of Swinbanks' Method of Active Attenuation of Sound in Ducts", Journal of Sound and Vibration (1976) 49(2), 257-266.

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