Method and apparatus for active cancellation of noise in a liqui

Details Method and apparatus for active cancellation of noise in a liqui Method and apparatus for active cancellation of noise in a liqui

1992-09-30

1995-06-06

Gregory, Bernarr E.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

H03B 2900

Patent

active

H00014451

ABSTRACT:
An method and apparatus for active noise cancellation in a conduit carrying a liquid, employing a detector hydrophone, an acoustic canceler downstream of the detector hydrophone, an error hydrophone, and an adaptive filter. The outputs of the detector hydrophone, acoustic canceler, and error hydrophone are directed into the adaptive filter, which uses them to select the form of acoustic signal which the canceler directs into the liquid to cancel the noise. One embodiment of the invention employs two such cancellation circuits, and an additional adaptive filter which globally optimizes the cancellation of both circuits.

REFERENCES:
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4736431 (1988-04-01), Allie et al.
patent: 5022082 (1991-06-01), Eriksson et al.
patent: 5091953 (1992-02-01), Tretter
patent: 5170433 (1992-12-01), Elliott et al.
Warnaka, "Active Attenuation of Noise-The State of the Art" Noise Control Engineering, May-Jun. 1982, vol. 18, No. 3, pp. 100-110.
"Electronic Attenuation of Noise and Vibration," Noise Canelation Technologies, Inc., 1987.
Culbreath et al., "Active Cancellation of Noise in a Liquid-Filled Pipe Using an Adaptive Filter," 83 J. Acoust. Soc. Am. 1306 (No. 4, Apr., 1988).
W. G. Culbreath et al., Active cancellation of Noise in a Liquid-Filled Pipe Using an Adaptive Filter, J. Acoust. Soc. Am. 83(4), pp. 1306 ff., Apr. 1988.

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