Patent ID: 7710833

Claim:
A radio-controlled timepiece comprising: a reception means that receives a standard radio signal containing time information; a demodulation means that demodulates the standard radio signal received by the reception means and outputs a demodulated signal; a waveform identification means that identifies a waveform of a prescribed period of the demodulated signal based on a specific waveform identification standard which sets first and second periods of time in the prescribed period, the waveform identification means outputting a code which is a binary code 0 if a signal level of the waveform changes in the first period, a binary code 1 if the signal level of the waveform changes in the second period, or a code M; a time information conversion means that converts the code output by the waveform identification means to time information; and a waveform identification standard changing means for changing the waveform identification standard by changing at least one of width and a starting position of each of the first and second periods, the waveform identification standard changing means including signal width measurement means for measuring signal width of the waveform of the demodulated signal, the waveform identification standard changing means setting the waveform identification standard based on the measurement by the signal width measurement means.