| 摘要 |
<P>PROBLEM TO BE SOLVED: To compatibly achieve dimming of an LED and communication by the LED by controlling a single current signal supplied to the LED, in a visible optical communication system. <P>SOLUTION: Lighting equipment 2 of the visible optical communication system 1 has the LED 21, a communication signal generator 22 which generates a communication signal, a dimming signal generator 23 which generates a dimming signal, a pulse width control means 24 for controlling the pulse width of a current to be supplied to the LED 21, and a pulse height control means 25 for controlling the pulse height of the current. The pulse height control means 25 performs current control, corresponding to the dimming signal to the LED 21 and the pulse width control means 24 performs current control, corresponding to the communication signal, so that dimming control over the LED 21 and communication control can be performed independently by using the one current signal supplied to the LED 21. Thus, dimming of the LED 21 and communication by the LED 21 can be made compatible. <P>COPYRIGHT: (C)2008,JPO&INPIT |
