| 摘要 |
A quartz oscillator-driven time-measuring circuit normally and substantially continuously updates the time display of a clock. A control circuit independent of the time-measuring circuit receives the standard time interval pulse signal broadcast by WWV/WWVH which includes longer pulses signaling each minute and shorter pulses signaling the seconds between minutes. The control circuit includes mechanism activated by the longer minute pulses to set the clock display intermittently, i.e. once each minute. Between minutes, the time-measuring circuit updates the clock display. |
