| 摘要 |
The real-time clock uses the sync signals of the vertical synchronization of a TV picture for the comparison with the oscillation of the clocks quartz crystal. In dependence on said comparison, correction values are calculated. Either a number of additional intervals is added if the real oscillator frequency is too low, or the adding of regular intervals is skipped for a number of intervals if the oscillator frequency is too high, wherein said number is detected with the use of sync pulses. |
