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Cancelling noise caused by the flicker of ambient lights

  • US 9,805,237 B2
  • Filed: 08/01/2016
  • Issued: 10/31/2017
  • Est. Priority Date: 09/18/2015
  • Status: Active Grant
First Claim
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1. A barcode scanning device comprising:

  • a light source configured to emit a beam of light;

    a first sensor configured to detect a first optical signal indicative of light reflecting off of a barcode, the reflected light originating from the light source and from at least one ambient light source in the vicinity of the barcode scanning device;

    a second sensor configured to detect a second optical signal indicative of light originating from the at least one ambient light source;

    a noise cancelling circuit configured to obtain a noise-cancelled scanning signal from the first and second optical signals; and

    a mirror having an aperture in the center of the mirror, wherein the first sensor is configured to sense light illuminating through the aperture and the second sensor is configured to sense light reflected off of the mirror.

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