Attenuation of sound waves

Details Attenuation of sound waves Attenuation of sound waves

1984-06-14

1986-05-13

Dwyer, James L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

F01N 106

Patent

active

045891338

ABSTRACT:
An active sound control system is described in which allowance is made in a relatively uncomplicated circuit for acoustic coupling between a sound generating system for generating a cancelling sound wave and a detector for sensing a sound wave to be cancelled. Unwanted sound from a source is detected by a microphone and cancelled by sound from a speaker connected by way of an amplifier to the microphone. The amplifier has a feedback processing system with a transfer function which takes account of acoustic feedback between the speaker and the microphone in deriving, with the amplifier, a signal to drive the speaker.

REFERENCES:
patent: 4044203 (1977-08-01), Swinbanks
patent: 4449235 (1984-05-01), Swigert
patent: 4455675 (1984-06-01), Bose et al.
patent: 4480333 (1984-10-01), Ross

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