| 摘要 |
PURPOSE:To obtain always accurate time display by means of a medium/large clocks by arranging an equipment for receiving an optical signal or the like, a signal code deciding circuit, a reference signal generating part, a driving pulse forming circuit, etc., in the medium/ large clock such as a wall type clock. CONSTITUTION:In normal operation, a signal H and a signal L are respectively outputted from pins No.9, No.10 in a code bit deciding circuit 27, analog switches 232, 231 are respectively turned to ON and OFF and a signal Q16 is sent to a data shift circuit 234 through an OR gate 233. In the case of executing fast feeding for time correction, a 12-bit signal for controlling a cyclic signal is sent from a transmitter. The signal is detected by a photodetecting element 25, decided by the circuit 27 through an amplifying TR 26, and when the decided result is OK, the signal L is outputted from the pin No.9, the analog switches 232, 231 are respectively turned to OFF and ON, and a signal Q10 is sent to the circuit 234 through the OR circuit 233. In the case of delaying time, the 12-bit signal for controlling the cyclic signal is sent from the transmitter and the signal H is outputted from the pin No.10 in the circuit 27 through the element 25 and the TR 26. |
