Communications – electrical: acoustic wave systems and devices – Sonar counter-measures
Patent
1972-05-01
1991-04-30
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Sonar counter-measures
367131, 367 87, H04K 300
Patent
active
050124528
ABSTRACT:
A transducer projects bursts of ultrasonic energy having broadbandwidths stantially identical to the energy pulses transmitted by a porpoise or dolphin. Immediately prior to the projection of the broadband ultrasonic signals, a range gate pulse is transmitted which, necessarily, first reaches the target and is reflected back toward a hydrophone carried adjacent the transducer-projector. At the termination of the reflected range gate pulse, the reflected broadband ultrasonic signals are gated into a pulse stretcher. During the relatively long intervals between the time that successive bursts of the broadband ultrasonic signals are projected or received, the pulse stretcher functions to translate and divide the broadband ultrasonic signals into signals lying within the audio spectrum. Due to the uniquely connected analog-to-digital, buffer storage, and digital-to-analog circuit components, the translation from the ultrasonic spectrum to the audio spectrum is done in a real-time basis to provide an audio representation having substantially the same information content as the ultrasonic signals.
REFERENCES:
patent: 2948879 (1960-08-01), Papberg, Jr. et al.
patent: 3176262 (1965-03-01), Ehrlich et al.
patent: 3363226 (1968-01-01), Murphree
patent: 3380018 (1968-04-01), Littrell et al.
patent: 3715509 (1973-02-01), Dawson
Blanc Clarence G.
Johnson Clarence S.
Fendelman Harvey
Keough Thomas Glenn
Pihulic Daniel T.
The United States of America as represented by the Secretary of
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