WIRELESS COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent desynchronization caused by time lags of a timer means for counting intermittent reception intervals.

SOLUTION: A control unit 1 of a fire alarm TR detects a time lag ΔT between reception timing of a synchronization signal and the intermittent reception interval counted by a timer. Further, the control unit 1 corrects the time lag ΔT detected by increasing and decreasing a control voltage of a voltage-controlled crystal oscillator for composing the timer, thus preventing desynchronization caused by the time lag of a timer means for counting the intermittent reception interval.

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