ILLUMINATION DEVICE AND METHOD FOR EMBEDDING A DATA SIGNAL IN A LUMINANCE OUTPUT USING AC DRIVEN LIGHT SOURCES
First Claim
1. An illumination device connectable to an AC voltage source for applying an alternating voltage during a series of time intervals, the illumination device comprising at least a first light source and a second light source, arranged in series to said AC voltage source to generate a luminance output in response to said alternating voltage, said illumination device further comprising selection means for selectively applying said alternating voltage over said first light source or said first and second light source, and a controller configured for controlling said selection means in response to a data signal comprising data symbols such that one or more of said data symbols are contained in said luminance output.
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Accused Products
Abstract
The invention relates to an illumination device connectable to an AC voltage source for applying an alternating voltage during a series of time intervals. The illumination device comprises at least a first light source and a second light source, arranged to be connected in series to the AC voltage source, to generate a luminance output in response to the alternating voltage. Selection means are provided configured for selectively applying the alternating voltage over the first light source or the first and second light source. A controller is provided for controlling the selection means in response to a data signal comprising data symbols such that one or more of the data symbols are contained in said luminance output. The invention also relates to a method of embedding one or more data symbols in the luminance output of such an illumination device, an optical receiver and an illumination system.
37 Citations
15 Claims
- 1. An illumination device connectable to an AC voltage source for applying an alternating voltage during a series of time intervals, the illumination device comprising at least a first light source and a second light source, arranged in series to said AC voltage source to generate a luminance output in response to said alternating voltage, said illumination device further comprising selection means for selectively applying said alternating voltage over said first light source or said first and second light source, and a controller configured for controlling said selection means in response to a data signal comprising data symbols such that one or more of said data symbols are contained in said luminance output.
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10. (canceled)
- 13. A method of embedding one or more data symbols of a data signal in a luminance output of an illumination device connectable to an AC voltage source for applying an alternating voltage during a series of time intervals, the illumination device comprising at least a first light source and a second light source, connected in series to said AC voltage source, to generate said luminance output in response to said alternating voltage, the method comprising the step of selectively applying said alternating voltage over said first light source or said first and second light source in response to said data signal such that one or more of said data symbols are embedded in said luminance output.
Specification