| 摘要 |
PROBLEM TO BE SOLVED: To attain the power saving and reduction in size of a time information receiving device capable of receiving signals of multiple frequencies containing time information. SOLUTION: A control circuit 8 sets the resonance frequency of an antenna block 1 to 60 kHz. A long wave standard radio wave of 60 kHz received by the antenna block 1 is amplified and passed through a quartz filter 3b. The signal passed through the quartz filter 3b is amplified, detected, and smoothed to form a signal matched to the envelope of the long wave standard radio wave. This signal is decoded to a time code signal in a decoder circuit 7. The control circuit 8 acquires time data on the basis of the time code signal, and corrects the clocked time of a timer part 9a on the basis of the acquired time data. When the DC signal showing the receiving intensity of the received long wave standard radio wave does not reach a prescribed level, the control circuit 8 sets the resonance frequency of the antenna block 1 to 40 kHz. The antenna block 1 receives a long wave standard radio wave of 40 kHz and outputs it as an electric signal, and the same operation as the above is performed. |
