Signal detection method of radio-controlled timepiece and radio-controlled timepiece

摘要

PROBLEM TO BE SOLVED: To provide a radio wave correction clock that can surely perform a second synchronization upon reception of a standard radio wave.SOLUTION: The radio wave correction clock comprises: a binarization circuit 37 that outputs a binarization signal having an envelope signal binarized; a determination timing setting part 411 that sets a determination timing for determining g a signal detection determination; and a signal detection determination part 412 that acquires the binarization signal for every second with reference to the determination timing, and determines whether an every second signal can be detected or not. The determination timing setting part 411 sets a timing generated at an interval of 1 sec. before a prescribed time of a start timing of a signal maximum in a signal width of a first level during a first determination period as the determination timing. The signal detection determination part 412 sequentially acquires a signal for 1 sec. from the determination timing, detects the start timing of the signal maximum in the signal width of the first level among the signals for 1 sec., detects an interval of the start timing and determines whether the every second signal can be detected or not.