Transmitting device, transmission control device, and transmission method

A transmission control device, comprising:

• a processor configured to
• control a lighting device to modulate the first characteristic of light, which is emitted from the lighting device according to a light emission pattern having a waveform according to information to be transmitted and having a first time length, along time series in a period having the first time length,
• set a number of sampling points in the period of the light emission pattern,
• control the lighting device to perform a pulse modulation with a pulse pattern having a second time length shorter than the first time length with respect to a second characteristic of the light emitted from the lighting device according to the information to be transmitted, and
• set, for each of a plurality of subsections obtained by dividing the period by the number of sampling points, a peak value and a bottom value of the second characteristic of each pulse included in the subsection, to make an average value of the second characteristic of the light emitted from the lighting device in the subsection after multiplexing of the pulse modulation and the modulation by the light emission pattern equal to a value of the second characteristic at a sampling point of the light emission pattern included in the subsection according to the modulation by the light emission pattern.

A communication method, comprising:

• modulating, in a period having a first time length, a first characteristic of light emitted from a lighting device in time series in accordance with a light emission pattern having a waveform according to information to be transmitted and having the first time length;
• setting a number of sampling points in the period of the light emission pattern;
• performing pulse modulation with a pulse pattern having a second time length shorter than the first time length with respect to a second characteristic of the light emitted from the lighting device in accordance with the information to be transmitted;
• and
• setting, for each of a plurality of subsections obtained by dividing the period by the number of sampling points, a peak value and a bottom value of the second characteristic of each pulse included in a subsection, to make an average value of the second characteristic of the light emitted from the lighting device in the subsection after multiplexing of the pulse modulation and the modulation by the light emission pattern equal to a value of the second characteristic at a sampling point of the light emission pattern included in the subsection according to the modulation by the light emission pattern.