| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of adjusting the characteristic of an F-V converter forming an FSK (frequency-shift keying) demodulator of an FSK communication system which is applicable to communication between cases of a foldable cellular phone in which an operation key side case is coupled to a display side case by a hinge portion. SOLUTION: An FSK communication system sends an instruction of requesting wireless transmission of an adjustment frequency signal by wired communication (cable 301) from a microprocessor of a receiver 200 to a transmitter 100, and in response to this, the receiver 200 receives the adjustment frequency signal wirelessly transmitted from the transmitter 100, the microprocessor 205 of the receiver 200 evaluates a result of F-V conversion, and adjustment of a center voltage of an amplitude of an input of the V-F converter is instructed to the transmitter 100 by wired communication depending on a result of evaluation. COPYRIGHT: (C)2006,JPO&NCIPI
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