| 摘要 |
PURPOSE:To provide a pulse signal detecting circuit, which is noise-proof and of high accuracy, by detecting the rise of rectangular signal out of the stored content wherein multiple data obtained by sampling rectangular signal are added to in accumulation, in the same address for each cycle. CONSTITUTION:When the electric wave containing time information is received by a reception circuit 2, an address counter 5 is set to '0', and the stored content of a memory circuit 7 is initialized, for activating a sampling circuit 3. The sampling circuit 3, each time internal clock signal is generated, samples the rectangular signal outputted from the reception circuit 2, and it is stored in the memory area of the memory circuit 7 specified by the address counter 5 which counts the internal clock signal, and after the data of ten cycles is cyclically stored in accumulation for each cycle, the point where the data value becomes larger or smaller than 8 is detected, and from this detection result, rise of pulse is detected. Based on this rise, time is calibrated for realization of accurate radio wave correction clock. |
