Communications – electrical: acoustic wave systems and devices – Underwater system – Analog speech communication
Patent
1996-02-13
1997-08-26
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Underwater system
Analog speech communication
367199, H04B 1100
Patent
active
056616996
ABSTRACT:
An acoustic communication system comprises: a voice processing circuit wh generates a first signal representing a voice message; a noise sensor channel which generates a second signal in response to detecting background noise in an environment; a microcomputer which receives the first and second signals, and provides a third signal to a selected one of first and second output ports of the microcomputer, where the amplitude of the third signal is functionally related to the value of the second signal; an ultrasonic output channel coupled to the first output port and which generates an ultrasonic output signal representing the voice message in response to receiving the third signal; a pubic address channel coupled to the second output port which generates an audible signal representing the voice message in response to receiving the third signal; and an ultrasonic receiving system which generates an audible output representing the voice message in response to receiving the ultrasonic output signal.
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Fendelman Harvey
Kagan Michael A.
Lipovsky Peter A.
Lobo Ian J.
The United States of America as represented by the Secretary of
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