| 摘要 |
PROBLEM TO BE SOLVED: To allow a receiver to normally receive signals from plural optical radio devices even when the signals collide with each other. SOLUTION: Signals photoelectric/converted by light receiving elements 1-1, 1-2, 1-3 are respectively selected by switches SW1, SW2, SW3 and outputted to a post-stage. In this case, a level priority circuit 6 controls the signal received by the light receiving elements 1-1, 1-2, 1-3 so that only the signal of the system whose level is maximum can pass through the switches SW1, SW2, SW3. Furthermore, the level priority circuit 6 controls the signals so that only a signal of a prescribed system can pass through the switches SW1, SW2, SW3 in the case that the levels of the signals of two or more systems are nearly the same and controls only a signal of a 1st system to pass through the switches SW1, SW2, SW3 till the reception of the signal of the 1st system is finished in the case that a signal of a 2nd system whose level is higher than that of the signal of the 1st system is received during the reception of the signal of the 1st system. A speed priority circuit 7 controls the signal of the 2nd system to pass through till the reception of the signal of the 1st system is finished in the case that the signal of the 2nd system is received during the reception of the signal of the 1st system. |
