Patent ID: 9608724
Date: 2017-03-28
CPC Classifications: H04B,H05B

Claim:
1. A method for embedding data in light, comprising the steps of operating at least two light sources (A, B) arranged to emit light having color coordinates (x, y) and luminous intensity (Y), wherein each light source is arranged to emit light having color which is distinguishable from the light of at least one other light source, and embedding data in the light emitted from the at least two light sources, wherein the at least two light sources comprise a first subset of light sources that emits light having a first property and a second subset of light sources, different from the first subset, that emits light having a second property distinguished from the first property, wherein the light emitted by the at least two light sources is modulated in accordance with a modulation scheme such that a presence of said first property from said first subset that is greater than any presence of said second property from said second subset defines a logical value in said modulation scheme, and operating the at least two light sources such that the color coordinates of the light emitted from the at least two light sources are maintained over time within a first, bounded interval, and the luminous intensity of the light emitted from the at least two light sources is maintained over time within a second, bounded interval.