Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Patent
1990-09-25
1991-10-22
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
Responsive to intruder energy
367 3, H04B 106
Patent
active
050602063
ABSTRACT:
A marine acoustic detector for use in identifying a characteristic airborne sound pressure field generated by a propeller-driven aircraft including a surface-buoyed resonator chamber tuned to the narrow frequency band of the airborne sound pressure field and having a dimensioned opening formed into a first endplate of the chambver for admitting the airborne sound pressure field. Mounted within the resonator chamber is a transducer circuit comprising a microphone and a pre-amplifier, the microphone functioning to detect the resonating sound pressure field within the chamber and to convert the resonating sound waves into an electrical signal while the pre-amplifier functions to amplify the electrical signal for transmission via a cable to an underwater or surface marine vehicle to undergo signal processing. The sound amplification properties of the resonator air chamber are exploited in the passive detection of propeller-driven aircraft at airborne ranges exceeding thoses ranges of visual or sonar detection to provide 44 dB of received sound amplification at common aircraft frequencies below 100 Hz.
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Allied-Signal Inc.
McFarland James W.
Pihulic Daniel T.
Walsh Robert A.
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