Active control of sound waves

Details Active control of sound waves Active control of sound waves

1975-08-25

1977-08-23

Olms, Douglas W.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181 33L, 181 33H, E04B 199, G10K 1104

Patent

active

040442039

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; those travelling in the same direction as the unwanted wave sum to give a resultant which interferes destructively with the unwanted wave, while those travelling in the opposite direction sum to give a negligible resultant. The source array may be operated in response to detection of the unwanted wave.

REFERENCES:
patent: 2043416 (1936-06-01), Lueg
patent: 3693749 (1972-09-01), Motsinger et al.
patent: 3826870 (1974-07-01), Wurm et al.
patent: 3936606 (1976-02-01), Wanke

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