| 摘要 |
(106) comprises means (108, 111) for periodically and automatically connecting the timepiece (106) to a standard time signal via a telephone system (109, 110, 112, 113) for automatically synchronising the timepiece (106) with the standard time signal. The timepiece (106) is preferably capable of automatically adjusting its frequency or running speed in accordance with the deviation from the standard time, thus minimising accumulative errors between synchronisations. The telephone standard time signal may be derived from the generally available vocal time repeat or "talking clock". In this case, the time signal may be identified from the vocal signal by differences in period between subsequent signals and the time signal may be further identified by counting the number of vocal signals associated with it. The timepiece (106) may be connected to several secondary timepieces (107) of simpler construction, for example not having the automatic telephone communication facility, in order to provide a system of synchronised timepieces. <IMAGE> |
