| 摘要 |
<P>PROBLEM TO BE SOLVED: To receive only a desired signal by removing unnecessary signals at a reception side if reception areas overlap with each other even when a plurality of different optical signals are sent to different areas. <P>SOLUTION: Respective visible light transmission parts 1R, 1G, and 1B of R, G, and B modulate the visible light in different wavelengths with audio signals of three channels and visibly transmit them so that reception areas overlap with one another, and reception cards 2a and 2b each receive at least one wavelength through a color filter 20 from the visible light transmitted from one of the visible light transmission parts, and photoelectrically converts and modulates the received wavelength. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
