Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1992-02-06
1994-05-24
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367135, 367137, 310314, 310317, 47 17, 239 77, H04R 1700
Patent
active
053155645
ABSTRACT:
The invention provides a controlling device which comprises a control box, a power box, a right sensor control unit attached to a plurality of proximity detectors, a left sensor control unit attached to a plurality of proximity detectors, and a valve box control unit, wherein each proximity detector comprises an ultrasonic transducer, a first circuit for handshaking, noise reduction and voltage regulation, and a second and third circuit for digital signal generation, analog reception and digital conversion, wherein the first circuit is connected between a left or right sensor control and second and third circuits of a proximity detector.
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C. Biber et al, "The Polaroid Ultrasonic Ranging System", 67th Convention Audio Engineering Society in New York, Oct. 31, 1980.
Polaroid Corp., "Ultrasonic Ranging System", undated.
Polaroid Corp., "Polaroid Ultrasonic Ranging System Handbook Application Notes/Technical Papers", undated.
Eldred J. Woodrow
FMC Corporation
Kamp R. C.
Lee Michael
Megley R. B.
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