| 摘要 |
An automatic time setting device for a watch automatically sets the time by second level, receiving the broadcasting time signal. In a watch system made of a crystal oscillator, several counters, a 7-segment transformer, a time displayer and key in member, the time setting device includes a demodulator, a low band filter, a trinary system counter, AND gates, R-S flip-flops, a comparator, a NOR gate, a frequency divider, OR gates. |
