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Proximity sensing systems and methods

  • US 9,223,023 B2
  • Filed: 08/19/2014
  • Issued: 12/29/2015
  • Est. Priority Date: 04/11/2014
  • Status: Active Grant
First Claim
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1. An ultrasonic sensing system, comprising:

  • an ultrasonic transmitter configured to provide a transmission of ultrasonic signals;

    an ultrasonic receiver configured to receive ultrasonic signals generated as a result of the transmission including reverberation signals and echo signals;

    an attenuator circuit connectable to the ultrasonic receiver via a switch, the attenuator circuit operable for attenuating the received ultrasonic signals; and

    a microcontroller unit (MCU) configured to control the switch to electrically couple the ultrasonic receiver with the attenuator circuit during a predetermined period of time after the transmission of ultrasonic signals and electrically decouple the ultrasonic receiver from the attenuator circuit prior to and after the predetermined period of time.

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