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Proximity sensing systems and methods

  • US 9,921,057 B2
  • Filed: 11/20/2015
  • Issued: 03/20/2018
  • Est. Priority Date: 04/11/2014
  • Status: Active Grant
First Claim
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1. An ultrasonic sensing system, comprising:

  • an attenuator circuit connectable to an ultrasonic receiver via a switch and configured to attenuate ultrasonic signals received by the ultrasonic receiver, wherein the ultrasonic signals comprise a reverberation signal and an echo signal; and

    a controller configured to control the switch so as to electrically couple the attenuator circuit with the ultrasonic receiver during a predetermined period of time after a transmission of an ultrasonic signal and electrically decouple the attenuator circuit from the ultrasonic receiver prior to and after the predetermined period of time.

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