STANDARD RADIO WAVE RECEIVING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a standard radio wave receiving circuit for properly demodulating a standard radio wave.

SOLUTION: The standard radio wave receiving circuit 1 is provided with: a receiving means 3 for demodulating the standard radio wave; and a controlling means 4 for outputting a control signal for controlling the receiving means. The receiving means 3 is provided with: a signal amplifying section 32 for amplifying a received signal associated with the standard radio wave; a rectifying section 35 for rectifying the amplified received signal; a filter section 35 for filtering the rectified received signal; a comparing section 37 for outputting a binary signal binarized by comparing the filtered received signal with a reference voltage; a reference voltage switching section 38 configured so as to output different reference voltages to the comparing section, and switching the output reference voltages based on the control signal; and a storing section 42 for storing switching state information for indicating a switching state of the reference voltage corresponding to the standard radio wave. The controlling means 4 outputs the control signal based on the switching state information. The reference voltage switching section 38 can output the reference voltage suitable for received standard radio wave to the comparing section 37.

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