| 摘要 |
PURPOSE:To make improvement in operation margin by previously detecting the time difference between a positive polarity pulse and a negative polarity pulse and varying the delay time of the pulse of the one polarity in correspondence to this time difference. CONSTITUTION:A 1st pulser 5 which generates the pulse E of a prescribed pulse width at the rising edge of the positive polarity output pulse C of a compa rator 4 and a 2nd pulser 6 which generates the pulse D of a prescribed pulse width at the rising edge of the positive polarity output pulse K of the compara tor 4 are provided. A 1st delay circuit 7 which delays the output pulse E of the pulser 5 by the specified time, a 2nd delay circuit 8 which delays the output pulse D of the pulser 6 by the delay time determined by a control signal H, and an OR circuit 9 which ORs the output pulses F, G of the delay circuits 7, 8 are provided. Further, a ROM 10 which is controlled by a head address signal I and a means for delivering the output signal of the ROM 10 as the control signal H toward the delay circuit 8 are provided to constitute the above circuit. The operation margin at the time of data reproduction is improved in this way. |
