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Optical communication for solid-state light sources

  • US 9,705,594 B2
  • Filed: 03/15/2013
  • Issued: 07/11/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A lighting fixture for general lighting purposes, comprising:

  • an array of solid-state light sources configured to generate light for general illumination; and

    control circuitry configured to control a drive signal to at least one solid-state light source of the array of the solid-state light sources with a control output which is configured to;

    set at least one characteristic of the light generated by the array of the solid-state light sources; and

    modulate the light generated by the at least one solid-state light source with data for transmission using frequency shift keying (FSK) such that any change in the at least one characteristic based on the light being modulated is anthropically imperceptible, wherein the light from the at least one solid-state light source is pulse-width modulated (PWM) at a first frequency and a first duty cycle to represent a first bit state and the light from the at least one solid-state light source is PWM at a second frequency and a second duty cycle to represent a second bit state.

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