| 摘要 |
<p>PURPOSE:To accurately reproduce data of information 1, 0 by controlling an analog type phase control synchronizing oscillator by the pulses which detect the peak points of the read signal of the magnetic tracks having been recorded by a phase modulating system. CONSTITUTION:The clock frequency from an analog phase control synchronizing oscillator 17 is made 2n times the data clock frequency of a peak detector 16 and a digital phase control oscillator 19 and demodulator 18 are controlled by this clock signal. When the period of the data clock having been synchronized by the oscillator 17 is set at T, it becomes the shift register output signal controlled by the clock signal 21 of 2nf times at a pulse width T/2n. The oscillator 19 outputs the data synchronizing signal phase-synchronized to the data clock signal of an arbitrary track at an error of + or -DELTA=T/2(DELTA/2n) to the demodulator 18 and further sends the output signal of the scale-of-2n counter in the oscillator 19 controlled by this signal and cycled by the clock signal from the oscillator 17 to the demodulator 18. Thereby, the data of 1, 0 are accurately reproduced.</p> |
