Piezoelectric driven flow modulator

Details Piezoelectric driven flow modulator Piezoelectric driven flow modulator

1993-05-26

1996-02-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381165, 381190, 310328, 310330, 310331, G10K 1116

Patent

active

054936152

ABSTRACT:
An elliptically shaped flow modulator in a duct with a circular cross section is used to produce a time varying head loss in a steady fluid flow in the duct, which results in an unsteady volume velocity at the end of the duct which radiates an acoustic field; the flow modulator can be used in place of a conventional acoustic source in an active noise control system.

REFERENCES:
patent: 3050034 (1962-08-01), Benton
patent: 3456669 (1969-07-01), Lloyd
patent: 4545561 (1985-10-01), Brown
patent: 4593658 (1986-06-01), Moloney
patent: 4787071 (1988-11-01), Kreuter et al.
patent: 4812698 (1989-03-01), Chida et al.
patent: 5040560 (1991-08-01), Glezer et al.
patent: 5207737 (1993-05-01), Hanley et al.

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