Method and system for modulating a beacon light source in a light based positioning system
First Claim
1. A method for broadcasting a modulated digital pulse recognition signal from a light source, the method comprising:
- without communication from a server, selecting one or more digital pulse recognition tones to broadcast, wherein the one or more digital pulse recognition tones are selected from a set of desired digital pulse recognition tones and the set of desired digital pulse recognition tones has a minimum frequency, a maximum frequency, and are separated by a minimum frequency step interval;
determining a desired brightness level for the light source;
generating a digital pulse recognition signal having a duty cycle based on the desired brightness level and a frequency based on the one or more digital pulse recognition tones; and
driving the output of the light source with the digital pulse recognition signal.
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Abstract
In one aspect, the present disclosure relates to a method for broadcasting a modulated digital pulse recognition signal from a light source. In some embodiments, the method includes selecting one or more digital pulse recognition tones to broadcast, determining a desired brightness level for the light source, generating a digital pulse recognition signal having a duty cycle based on the desired brightness level and a frequency based on the one or more digital pulse recognition tones, and driving the output of the light source with the digital pulse recognition signal. In some embodiments, selecting one or more digital pulse recognition tones to broadcast includes generating a single periodic tone for differentiating the light source from a nearby light source. In some embodiments, selecting one or more digital pulse recognition tones to broadcast includes generating a sequence of periodic tones.
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Citations
20 Claims
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1. A method for broadcasting a modulated digital pulse recognition signal from a light source, the method comprising:
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without communication from a server, selecting one or more digital pulse recognition tones to broadcast, wherein the one or more digital pulse recognition tones are selected from a set of desired digital pulse recognition tones and the set of desired digital pulse recognition tones has a minimum frequency, a maximum frequency, and are separated by a minimum frequency step interval; determining a desired brightness level for the light source; generating a digital pulse recognition signal having a duty cycle based on the desired brightness level and a frequency based on the one or more digital pulse recognition tones; and driving the output of the light source with the digital pulse recognition signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light source for broadcasting a modulated digital pulse recognition signal comprising:
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an emitter with a light output; and a modulator for selecting, without communication from a server, one or more digital pulse recognition tones to broadcast, determining a desired brightness level for the light source, generating a digital pulse recognition signal having a duty cycle based on the desired brightness level and a frequency based on the one or more digital pulse recognition tones, and driving the light output of the emitter with the digital pulse recognition signal, wherein the one or more digital pulse recognition tones are selected from a set of desired digital pulse recognition tones and the set of desired digital pulse recognition tones has a minimum frequency, a maximum frequency, and are separated by a minimum frequency step interval. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification