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Device-free tracking system that accurately tracks hand movement

  • US 10,386,482 B2
  • Filed: 01/24/2017
  • Issued: 08/20/2019
  • Est. Priority Date: 01/25/2016
  • Status: Active Grant
First Claim
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1. A method for tracking movement of an object, the method comprising:

  • transmitting audio signals from one or more speakers to said object;

    receiving samples of said audio signals reflected from said object over a period of time;

    mixing said received audio signals with said transmitted audio signals;

    performing, by a processor, a fast Fourier transform on said mixed audio signals;

    selecting, by said processor, one or more peak frequencies in a frequency domain of said fast Fourier transformed mixed audio signals;

    estimating a velocity of said object; and

    estimating, by said processor, a distance from a speaker of a controlled device to a microphone of said controlled device via said object based on said selected one or more peak frequencies and velocity of said object.

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