| 摘要 |
PURPOSE:To make automatic regulation of the time of a timepiece by detecting the sound of the time announcement service signal received through a circuit and discriminating the pattern of this signal sound. CONSTITUTION:The signal sound transmitted through the public circuit 10 from a talkie device for the time announcement service is inputted to a tone detecting circuit 2. The tone pattern received in the circuit 2 is separated by filters 22, 23 to a signal around 500Hz and signal around 1,000Hz. The respective signals are inputted via signal lines 202, 210 to amplifiers 24, 25. The amplified signals are converted via decoders 26, 27 and signal lines 206, 214 to the signals suitable for a terminal control circuit 3, from which the signals are transmitted to a circuit 3. The circuit 3 contains the timepiece 32 by software control and transmits the signal to the time announcement service, for example, '117' according to the previously assigned automatic oscillation cycle. The time of the timepiece 32 is thus automatically regulated by the signal received in the circuit 2. |
