Illumination device and method for embedding data symbols in a luminance output
First Claim
1. An illumination system including:
- at least one illumination device, the illumination device comprising;
a first light source configured to generate, in response to a first drive signal, a first luminance output having a first output spectrum of visible light;
a second light source configured to generate, in response to a second drive signal, a second luminance output having a second output spectrum of visible light different from the first output spectrum, the illumination device producing a luminance output of visible light comprising both the first luminance output and the second luminance output; and
a controller configured for;
receiving a first base pattern within a frame period and a second base pattern, separate from the first base pattern, within the frame period, wherein the first base pattern and the second base pattern are both variable to adjust a power level and color of the luminance output of the illumination device,generating a shifted second pattern by phase shifting the second base pattern within the frame period with respect to the first base pattern in response to a data signal such that the one or more data symbols of the data signal are embedded in the luminance output of the illumination device,providing the first base pattern to the first light source as the first drive signal, andproviding the shifted second base pattern to the second light source as the second drive signal; and
a remote control device for controlling the at least one illumination device, the remote control comprising at least one optical receiver comprising;
an optical detector configured for separately detecting at least a portion of the first luminance output of the first light source and at least a portion of the second luminance output of the second light source; and
a processing unit configured for;
receiving the first base pattern and the second base pattern within the frame period,receiving the shifted second pattern based on the detected portion of the second luminance output,determining a first phase difference between the second base pattern and the first base pattern for the frame period,determining a second phase difference between the shifted second pattern and the first base pattern for the frame period, anddetermining one or more of the data symbols of the data signal by comparing the second phase difference with the first phase difference for the frame period.
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Accused Products
Abstract
The invention relates to embedding data symbols of a data signal into a luminance output of an illumination device. The device includes a controller configured for receiving a first base pattern and a second base pattern within a frame period, and generating a shifted second pattern by phase shifting the second base pattern within the frame period with respect to the first base pattern in response to the data signal such that the data symbols are embedded in the luminance output of the device. The device also includes a first light source configured to generate a first luminance output in response to the first base pattern and a second light source configured to generate a second luminance output in response to the shifted second pattern. The first and second luminance outputs have different output spectra and the luminance output of the illumination device comprises both the first and second luminance outputs. With this approach, the short-time average light output of the illumination device remains constant, decreasing the visible flicker and allowing the use of lower switching frequencies relative to the prior art approaches.
10 Citations
19 Claims
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1. An illumination system including:
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at least one illumination device, the illumination device comprising; a first light source configured to generate, in response to a first drive signal, a first luminance output having a first output spectrum of visible light; a second light source configured to generate, in response to a second drive signal, a second luminance output having a second output spectrum of visible light different from the first output spectrum, the illumination device producing a luminance output of visible light comprising both the first luminance output and the second luminance output; and a controller configured for; receiving a first base pattern within a frame period and a second base pattern, separate from the first base pattern, within the frame period, wherein the first base pattern and the second base pattern are both variable to adjust a power level and color of the luminance output of the illumination device, generating a shifted second pattern by phase shifting the second base pattern within the frame period with respect to the first base pattern in response to a data signal such that the one or more data symbols of the data signal are embedded in the luminance output of the illumination device, providing the first base pattern to the first light source as the first drive signal, and providing the shifted second base pattern to the second light source as the second drive signal; and a remote control device for controlling the at least one illumination device, the remote control comprising at least one optical receiver comprising; an optical detector configured for separately detecting at least a portion of the first luminance output of the first light source and at least a portion of the second luminance output of the second light source; and a processing unit configured for; receiving the first base pattern and the second base pattern within the frame period, receiving the shifted second pattern based on the detected portion of the second luminance output, determining a first phase difference between the second base pattern and the first base pattern for the frame period, determining a second phase difference between the shifted second pattern and the first base pattern for the frame period, and determining one or more of the data symbols of the data signal by comparing the second phase difference with the first phase difference for the frame period. - View Dependent Claims (2, 3, 4)
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5. An illumination system including at least one illumination device, the illumination device comprising:
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a first light source configured to generate, in response to a first drive signal, a first luminance output having a first output spectrum of visible light; a second light source configured to generate, in response to a second drive signal, a second luminance output having a second output spectrum of visible light different from the first output spectrum, the illumination device producing a luminance output of visible light comprising both the first luminance output and the second luminance output; and a controller configured for; receiving a first base pattern within a frame period and a second base pattern, separate from the first base pattern, within the frame period, wherein the first base pattern and the second base pattern are both variable to adjust a power level and color of the luminance output of the illumination device, generating a shifted second pattern by phase shifting the second base pattern within the frame period with respect to the first base pattern in response to a data signal such that the one or more data symbols of the data signal are embedded in the luminance output of the illumination device, providing the first base pattern to the first light source as the first drive signal, providing the shifted second base pattern to the second light source as the second drive signal; and encoding each of the one or more of the data symbols in the luminance out of the illumination device as a phase difference in the frame period between the second shifted pattern embedded in the second luminance output and the first base pastern embedded in the first luminance output. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for embedding one or more data symbols of a data signal in a luminance output of an illumination device, the method comprising:
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receiving a first base pattern and a second base pattern within a frame period the first base pattern being varied to adjust a power level of a first visible color of the luminance output and the second base pattern being varied to adjust a power level of a second visible color of the luminance output, the second visible color being different than the first visible color; generating a shifted second pattern by phrase shifting the second base pattern within the frame period with respect to the first base pattern in response to the data signal comprising data symbols such that the one or more of the data symbols are embedded in the luminance output of the illumination device; generating, in response to the first base pattern, a first luminance output having the first visible color; generating, in response to the shifted second pattern, a second luminance output having the second visible color; and encoding each of the one or more of the data symbols in the luminance output of the illumination device as a phase difference in the frame period between the second shifted pattern embedded in the second luminance output and the first base pattern embedded in the first luminance output, wherein the luminance output of the illumination device comprises the first luminance output and the second luminance output. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification