Transmitting method, transmitting apparatus, and program
First Claim
1. A transmitting method for transmitting a visible light signal by changing luminance of a light emitter, the transmitting method comprising:
- determining a pattern of change in luminance of the light emitter by modulating a signal; and
transmitting the visible light signal by changing luminance of a red color represented by a light source included in the light emitter according to the determined pattern without using a blue color and a green color of the light source,wherein the visible light signal includes a first payload, a preamble, and a second payload which is different from the first payload, and the preamble is located between the first payload and the second payload along a time axis,in the first payload, a first luminance value and a second luminance value less than the first luminance value appear along the time axis, and a pattern of appearance of the first luminance and the second luminance within the first payload is predetermined,in the preamble, the first luminance value and the second luminance value appear alternately along the time axis, and a pattern of appearance of the first luminance and the second luminance within the preamble is predetermined, andwherein, in the second payload, luminance values appear in an order of the first luminance value which has a first time length, the second luminance value which has a second time length, the first luminance value which has a third time length, and the second luminance value which has a fourth time length, andin the transmitting, a first current flows to the light source when a sum of the first time length and the third time length is less than a second predetermined value, a second current flows to the light source when the sum of the first time length and the third time length is greater than the second predetermined value, and the first current is greater than the second current.
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Accused Products
Abstract
A transmitting method for enabling transmission of a visible light signal in short time includes: determining a pattern of change in luminance of the light emitter by modulating a signal; and transmitting the visible light signal by changing luminance of a red color represented by a light source according to the determined pattern. The visible light signal includes data, a preamble, and a payload. In the data, a first luminance value and a second luminance value appear along a time axis. In the payload, the first luminance value and the second luminance value appear alternately along the time axis, each of a time length in which the first luminance value is maintained and a time length in which the second luminance value is maintained is greater than a first predetermined value and is determined in accordance with the signal and a predetermined method.
247 Citations
12 Claims
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1. A transmitting method for transmitting a visible light signal by changing luminance of a light emitter, the transmitting method comprising:
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determining a pattern of change in luminance of the light emitter by modulating a signal; and transmitting the visible light signal by changing luminance of a red color represented by a light source included in the light emitter according to the determined pattern without using a blue color and a green color of the light source, wherein the visible light signal includes a first payload, a preamble, and a second payload which is different from the first payload, and the preamble is located between the first payload and the second payload along a time axis, in the first payload, a first luminance value and a second luminance value less than the first luminance value appear along the time axis, and a pattern of appearance of the first luminance and the second luminance within the first payload is predetermined, in the preamble, the first luminance value and the second luminance value appear alternately along the time axis, and a pattern of appearance of the first luminance and the second luminance within the preamble is predetermined, and wherein, in the second payload, luminance values appear in an order of the first luminance value which has a first time length, the second luminance value which has a second time length, the first luminance value which has a third time length, and the second luminance value which has a fourth time length, and in the transmitting, a first current flows to the light source when a sum of the first time length and the third time length is less than a second predetermined value, a second current flows to the light source when the sum of the first time length and the third time length is greater than the second predetermined value, and the first current is greater than the second current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transmitting apparatus which transmits a visible light signal by changing luminance of a light emitter, the transmitting apparatus comprising:
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a memory that stores instructions; and a processor that, when executing the instructions stored in the memory, perform operations including; determining a pattern of change in luminance of the light emitter by modulating a signal; and transmitting the visible light signal by changing luminance of a red color represented by a light source included in the light emitter according to the determined pattern without using a blue color and a green color of the light source, wherein the visible light signal includes a first payload, a preamble, and a second payload which is different from the first payload, and the preamble is located between the first payload and the second payload along a time axis, in the first payload, a first luminance value and a second luminance value less than the first luminance value appear along the time axis, and a pattern of appearance of the first luminance and the second luminance within the first payload is predetermined, in the preamble, the first luminance value and the second luminance value appear alternately along the time axis, and a pattern of appearance of the first luminance and the second luminance within the preamble is predetermined, and wherein, in the second payload, luminance values appear in an order of the first luminance value which has a first time length, the second luminance value which has a second time length, the first luminance value which has a third time length, and the second luminance value which has a fourth time length, and in the transmitting, a first current flows to the light source when a sum of the first time length and the third time length is less than a second predetermined value, a second current flows to the light source when the sum of the first time length and the third time length is greater than the second predetermined value, and the first current is greater than the second current.
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12. A non-transitory computer readable recording medium storing a program for transmitting a visible light signal by changing luminance of a light emitter, the program causing a computer to execute:
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determining a pattern of change in luminance of the light emitter by modulating a signal; and transmitting the visible light signal by changing luminance of a red color represented by a light source included in the light emitter according to the determined pattern without using a blue color and a green color of the light source, wherein the visible light signal includes a first payload, a preamble, and a second payload which is different from the first payload, and the preamble is located between the first payload and the second payload along a time axis, in the first payload, a first luminance value and a second luminance value less than the first luminance value appear along the time axis, and a pattern of appearance of the first luminance and the second luminance within the first payload is predetermined, in the preamble, the first luminance value and the second luminance value appear alternately along the time axis, and a pattern of appearance of the first luminance and the second luminance within the preamble is predetermined, and wherein, in the second payload, luminance values appear in an order of the first luminance value which has a first time length, the second luminance value which has a second time length, the first luminance value which has a third time length, and the second luminance value which has a fourth time length, and in the transmitting, a first current flows to the light source when a sum of the first time length and the third time length is less than a second predetermined value, a second current flows to the light source when the sum of the first time length and the third time length is greater than the second predetermined value, and the first current is greater than the second current.
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Specification