| 摘要 |
To enable tuning in to a standard radio signal readily, the receiving unit amplifies a signal output from the variable-capacitance diode (102) with an AGC amplifier, extracts a time code with the detection circuit (110), and outputs the time code to the control unit (104). The control unit detects the voltage level of a signal output from the AGC amplifier at points while changing the capacitance value of the variable-capacitance diode, makes, of the points where the voltage level has been detected, a point meeting a given requirement a tuning point, and sets the capacitance value of the variable-capacitance diode at the tuning point as a capacitance value to receive a time code when it is judged that the time code has been output from the detection circuit at the tuning point. Also, the control unit acquires current time information from the time code, corrects the current time that the clock unit clocks, and displays the precise current time with the display unit. |
