| 摘要 |
PURPOSE:To sharply reduce the energy consumption by a method wherein the time of starting and stopping the supply of power to a time-information regulating unit incorporated in an electronic watch is set according to the maximum lost time and the maximum gained time in a day of the watch. CONSTITUTION:A time-informing sound from a radio or the like is detected by a microphone 1 and passed through an automatic gain control circuit 2, a band-pass filter 3 and a waveform shaping circuit 4 to operate a time-correcting circuit 7, via a counters 5 and 6, so as to make it correct a time. When the maximum time lost in a day of a watch circuit 8 is denoted as t1 seconds and the time whereat a time information is generated is denoted as T o'clock, a power is supplied to a time-information regulating unit 9 (t1+3) seconds before T o'clock, and the power is broken (t1+t2+3) seconds after the power is supplied, wherein t2 seconds denote the maximum time gained in a day. Accordingly, the time-informing sound can be caught with the minimum consumption of energy, which can make efficient a small-sized apparatus such as a wristwatch. |
