| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique of suppressing increase of the probability of communication failure while suppressing increase of the circuit scale when plural frequency channels are used.SOLUTION: A reception unit 48 performs one of reception processing in a first frequency channel and reception processing in a second frequency channel different from the first frequency channel. When a transmission device using one frequency channel out of a first frequency channel and a second frequency channel is registered as a transmission device as a reception processing target in the reception unit 48, and transmission device using the other frequency channel is not registered, a controller 46 controls the reception unit 48 to use the one frequency channel and disuse the other frequency channel. When a new transmission device using the other frequency channel is registered, the controller 46 controls the reception unit 48 to alternately use the one frequency channel and the other frequency channel.SELECTED DRAWING: Figure 4 |
