| 摘要 |
Disclosed herein is a visible-light communication system according to one embodiment of the invention. The system comprises two apparatus. A first apparatus (20) emits a visible light beam (100) on which is superimposed first transmission data containing identification data identifying significant data or void data. From the void data represented by the visible light beam (100), the second apparatus (10) generates a retroflected light beam (200), superimposes second transmission data on the retroflected light beam (200), and sends the retroflected light beam (200) back to the first apparatus (20). On receiving the retroflected light beam (200), the first apparatus (20) identifies whether this beam contains void data or the second transmission data, on the basis of the identification data superimposed on the retroflected light beam (200).
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