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System, apparatus, and method for proximity detection

  • US 10,021,241 B2
  • Filed: 02/03/2016
  • Issued: 07/10/2018
  • Est. Priority Date: 02/03/2016
  • Status: Expired due to Fees
First Claim
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1. A mobile communication device, comprising:

  • a transmitter configured to transmit a periodic ultrasound signal;

    a receiver configured to receive the periodic ultrasound signal, the receiver located remote from the transmitter;

    a first filter coupled to the receiver and configured to filter the periodic ultrasound signal based on a frame length of the periodic ultrasound signal; and

    a detection logic circuit coupled to the first filter and configured to determine a power level of the periodic ultrasound signal, a signal to noise ratio of the periodic ultrasound signal, and whether the receiver is located in an enclosed environment based on the power level and the signal to noise ratio;

    wherein the first filter is configured to filter the periodic ultrasound signal by using a matrix wherein each column of the matrix represents one of a first frame, a second frame, a third frame, a fourth frame, a fifth frame, a sixth frame, and a seventh frame and each row of the matrix represents one of a first 1024 samples, a second 1024 samples, a third 1024 samples, a fourth 1024 samples, a fifth 1024 samples, a sixth 1024 samples, and a seventh 1024 samples, respectively.

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