| 摘要 |
The time-of-day offset of the local time-of-day clock (3), consisting of an oscillator (4) and a time-of-day processor (5), of the user system (1) is determined with respect to a reference time-of-day clock (10) by means of a comparator (13). Together with the time-of-day data, which contain the instant of startup or the preceding comparison and are stored in an updating instant memory (6), and with the updated time-of-day data of the reference time-of-day clock (10), these time-of-day offset data are then fed to an evaluator (14) in which the mean frequency accuracy of the oscillator (4) in the time-of-day clock (3) of the user system (1) is determined and can then be used both to adjust the temporal offsets of the time-of-day comparison intervals and for a frequency retuning of the oscillator (4) in the user system time-of-day clock (3). The invention can be applied in spatially separated systems, especially mobile systems, controlled by the time of day, eg information transfer systems operating with encoding and having a temporally changed code. <IMAGE> |
