| 摘要 |
A radio-controlled timepiece that receives a standard time signal containing a time code and adjusts the time based on the received standard time signal includes: a reception means that receives the standard time signal; an analog/digital conversion means that digitizes the received standard time signal based on a prescribed threshold value; a time counter that keeps time; a time code generating means that generates a reference time code based on the time counted by the time counter; a duty evaluation means that calculates the pulse duty cycle of the digital signal output from the A/D conversion means, and determines if the received pulse duty cycle that is calculated matches the duty cycle of the reference time code generated by the time code generating means; a level changing means that changes the relative level of the threshold value to the reception signal if the duty evaluation means determines that the received pulse duty cycle does not match the duty cycle of the reference time code; and a time code decoding means that decodes the digital signal and demodulates the time code if the duty evaluation means determines that the received pulse duty cycle matches the duty cycle of the reference time code. |
