Active control of sound waves

Details Active control of sound waves Active control of sound waves

1978-08-08

1979-10-16

Cooper, William C.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181206, F01N 106

Patent

active

041714652

ABSTRACT:
A sound wave propagated along a duct through a fluid contained in the duct is attenuated by generating sound waves from an array of sound sources spaced along the duct. Each source generates two waves travelling in opposite directions, the array being operated so that the resultant of those travelling in the same direction as the unwanted wave interferes destructively with the unwanted wave while the resultant of those travelling in the opposite direction is negligible. The array is operated in response to detection of the unwanted wave, the sound detector(s) being so positioned as to introduce a degree of acoustic coupling between the source array and the detection system.

REFERENCES:
patent: 3936606 (1976-02-01), Wanker
patent: 4044203 (1977-08-01), Swinbanks
patent: 4109108 (1978-08-01), Coxon et al.
Journal of Sound and Vibration, vol. 27, (1973), pp. 411-436, Swinbanks.

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