| 摘要 |
PROBLEM TO BE SOLVED: To allow only one PLL circuit to select a channel for transmission or reception frequency for the communication. SOLUTION: The channel selection system is provided with mixers 321, 312 that convert the difference between the oscillation frequency of a PLL circuit 304 of a 1st terminal 301 and an oscillation frequency of a PLL circuit 325 of a 2nd terminal 302, which circuits decide the transmission reception frequency of the terminals going to enter communication, into an intermediate frequency(IF). Thus a single PLL circuit selects a channel for a transmission/reception frequency for the communication.
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