| 摘要 |
PROBLEM TO BE SOLVED: To prevent a communication error and to realize stable infrared communication by providing a mixer part synthesizing the received light signals of plural infrared communication ports and a demultiplexing part outputting the output signal as a binary signal. SOLUTION: A mixer/demultiplexing means 60 synthesizes the received light signals of the infrared communication ports 10A-10D and outputs a synthesis signal as the binary signal. A signal intensity judgment means 70 judges the signal intensity of the received light signals. When the received light signal of any infrared communication port is not less than prescribed signal intensity, a controller 50 gives a switch signal for outputting the signal of a port selection control means 40 to a switch means 80 and gives a selection signal for selecting the received light signal of the port of not less than prescribed signal intensity to the port selection control means 40. When the received light signals of all the infrared communication ports 10A-10D are below prescribed signal intensity, the controller 50 gives the switch signal for outputting the signal of the mixer/ demultiplexing means 60 to the switch means 80. |
