Method and system for asynchronous lamp identification
First Claim
1. An illumination system for embedding data into a luminance output of the illumination system, the system comprising:
- a first controller configured for;
generating a first shifted base code by circularly shifting a base code within a base code period with a first phase shift to embed first data into the first shifted base code, wherein the first phase shift corresponds to the first data,generating a first information signal comprising the first shifted base code and a synchronization code, andgenerating a first modulated drive signal by modulating one or more of first drive patterns of a first drive signal in dependence of the first information signal such that the first data is embedded in the luminance output of the illumination system; and
a first light source configured for generating a first luminance output in dependence of the first modulated drive signal,wherein the luminance output of the illumination system comprises the first luminance output.
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Accused Products
Abstract
The invention relates to embedding data into a luminance output generated by an illumination system comprising a light source and a controller. The controller is configured to embed data by modulating a drive signal applied to the light source with an information signal comprising a shifted base code and a synchronization code. The synchronization code serves to provide synchronization for the receiver, while the shifted base code serves to carry the embedded data. A cyclic phase shift that is applied to a base code to generate the shifted base code corresponds to particular data, such as, for example, light source identification, that needs to be embedded into the luminance output of the illumination system. In this manner, data may be embedded into the luminance output generated by a light source without requiring synchronization of this light source with other light sources.
55 Citations
15 Claims
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1. An illumination system for embedding data into a luminance output of the illumination system, the system comprising:
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a first controller configured for; generating a first shifted base code by circularly shifting a base code within a base code period with a first phase shift to embed first data into the first shifted base code, wherein the first phase shift corresponds to the first data, generating a first information signal comprising the first shifted base code and a synchronization code, and generating a first modulated drive signal by modulating one or more of first drive patterns of a first drive signal in dependence of the first information signal such that the first data is embedded in the luminance output of the illumination system; and a first light source configured for generating a first luminance output in dependence of the first modulated drive signal, wherein the luminance output of the illumination system comprises the first luminance output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15)
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13. A method for embedding data into a luminance output of the illumination system, the method comprising:
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generating a first shifted base code by circularly shifting a base code within a base code period with a first phase shift to embed first data into the first shifted base code, wherein the first phase shift corresponds to the first data; generating a first information signal comprising the first shifted base code and a synchronization code; generating a first modulated drive signal by modulating one or more of first drive patterns of a first drive signal in dependence of the first information signal such that the first data is embedded in the luminance output of the illumination system; generating a first luminance output in dependence of the first modulated drive signal, wherein the luminance output of the illumination system comprises the first luminance output.
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Specification