Ultrasonic energy detector with frequency and amplitude indications and background noise reduction
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United States of America Patent
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Feb 18, 1992
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N/A
app pub date -
Nov 2, 1990
filing date -
Nov 2, 1990
priority date (Note) -
Expired
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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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