Communications – electrical: acoustic wave systems and devices – Receiver circuitry
Patent
1990-11-02
1992-02-18
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
367901, 367116, H04B 106
Patent
active
050899970
ABSTRACT:
An ultrasonic energy detector advantageously supplies both frequency and amplitude information which is related to the ultrasonic frequency and the amplitude of the detected ultrasonic energy. Frequency division is employed to reduce the relatively broad range of ultrasonic frequencies into a narrower audio frequency range while still providing information useful to identify the ultrasonic energy by frequency detection. The effect of anticipated background noise at all levels of gain selected is eliminated by subtracting a signal representative of the anticipated background noise and proportional to the selected predetermined gain from the amplitude of the detected ultrasonic energy.
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"Ultraprobe, The Ultimate in Ultrasonic Field Testing," UE Systems, Inc., date unknown.
"Ultrasonic Application, Selected Reprints", UE Systems, Inc., date unknown, original publication dates of Jan., 1983 through Jul., 1989, where known.
Product description sheet, UE Systems, Inc., date unknown.
Crouch Robert G.
Ley John R.
Pasar, Inc.
Pihulic Daniel T.
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