Measurement of reflected ultrasound signal for ultrasonic emitter gating control
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United States of America Patent
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May 23, 2017
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N/A
app pub date -
Mar 27, 2013
filing date -
Mar 27, 2013
priority date (Note) -
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Abstract
A method and apparatus to gate an ultrasonic emitter operation includes a housing including the ultrasonic emitter, where the ultrasonic emitter is operable to periodically transmit an ultrasonic pulse of a predefined frequency. A microphone circuit is disposed in the housing, such that the microphone circuit is operable to receive a reflected ultrasonic signal derived from the transmitted ultrasonic pulse. A controller is coupled to the emitter and the microphone circuit, where the controller operable to gate the operation of the emitter to an OFF state based on at least one measured parameter of the reflected ultrasonic signal. The parameters can include a Doppler measurement and a distance measurement.
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