COMMUNICATION SYSTEM, TUNER, AND SETTING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce article numbers of tuners for receiving electric waves from a portable machine.SOLUTION: A portable machine has a signal generation part that generates a first signal including frequency information for use in radio communication between itself and a tuner, and a transmission part that performs radio transmission of the first signal generated by the signal generation part. The tuner has a setting processing part for setting a reception frequency of an antenna and a demodulated frequency of a phase-synchronous circuit, on the basis of the frequency information included in the first signal from the portable machine.