| 摘要 |
<p>PURPOSE:To correct a clock automatically for disturbance caused by temperature change, shock, and so on, by detecting the difference between the reference just time such as a time signal and the clock just time to correct automatically the clock error from the next correction quantity based on addition data of the preceding correction quantity and the current error. CONSTITUTION:Counter 8 counts a pulse at every unit time such as 12hr output at the reference just time such as the time signal from counter circuit 4 of clock circuit 1, and the count value becomes a value corresponding to the passage frequency of standard just times through receiving unit 7. When the signal for reference just time receiving from unit 7 is applied to counter 8 and error detecting circuit 9, error detection, gaining or losing decision per a unit time between the standard just time and the clock just time are performed on a basis of the clock just time pulse from circuit 4 and the count value from counter 8, and the result is applied to accumulator 10 by circuit 9. Then, accumulator 10 operates the next correction quantity based on the error for reference just time receiving and the error correction quantity just before reference just time receiving and applies it to correction circuit 11. Consequently, disturbance of the clock caused by temperature change, shock and so on is corrected automatically, and the precision of the clock is improved.</p> |
