Automatic noise suppression system for acoustic height sensor

Details Automatic noise suppression system for acoustic height sensor Automatic noise suppression system for acoustic height sensor

1974-04-01

1979-09-25

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

73290V, 367900, 367901, G01S 968

Patent

active

041692551

ABSTRACT:
An acoustic height sensor, particularly adapted for use in the foil-borne mode of operation of a hydrofoil, wherein sensitivity to noise pulses is materially reduced or essentially eliminated by monitoring for noise levels capable of producing interference and, if the noise persists for a sufficiently long period, suspending processing of any signal returns until the noise ceases. In the meantime, and as processing of signal returns is suspended, sample and hold circuitry maintains the output of the system at its previous level until the noise abates.

REFERENCES:
patent: 3539978 (1970-11-01), Steptnitz
patent: 3704442 (1972-11-01), Wright
patent: 3739325 (1973-06-01), Ludwig
patent: 3944942 (1976-03-01), Chudleigh
Carpenter, "A Digital Echo-counting System for use in Fisheries Research," 5/67, pp. 289-294, The Radio and Electronic Engineer.

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