| 摘要 |
PURPOSE:To obtain a signal separating circuit of a non-control type which is free from any control of pulse, by using a synchronizing counter by which all FFs work under the control of the clock pulse. CONSTITUTION:A waveform (a) to be modulated given from a floppy disk device is supplied through a terminal I to be applied to a clear terminal CLR of a synchronizing counter IC7. The clock pulse of a waveform (b) having a frequency higher enought than the waveform (a) is supplied to a clock terminal J to be applied to the IC7. The waveforms (c), (d), (e) and (f) are delivered to output terminals QA-QD respectively of the FFs that form the IC7. A waveform (g) produced by dividing the waveform (e) by an FF6 is turned into a continuous pulse waveform having no drop-off even at the area corresponding to the drop-off position of the waveform (a) to be delivered to a terminal O. A waveform (h) produced by inverting the waveform (f) varies according to the drop-off of the waveform (a) and is delivered to a terminal P. As a result, the signal components showing a repetitive frequency and a digital data are obtained at the terminals O and P respectively. |
