| 摘要 |
PURPOSE:To obtain high quality optical disk by performing the analog corrections of digital signals which are different in a pulse width individually in accordance with the pulse widths. CONSTITUTION:After a digital signal D1 having pulse widths 2T to 4T is delayed in a timing circuits T1a, T1b, is ANDed with an inversion signal and becomes a gate basic signal Gr. At the same time, the digital signal D1 is endowed with delay amount d2 to d4 by delay lines DL2 to 4 and is outputted. As for the gate basic signal Gr, the gate signals G2 to G4 are outputted so that the gate basic signal Gr may contain an only terminal part of delay line output corresponding to the pulse widths of an input signal in the timing circuit T2, T4. The delay output D2 to d4 of a delay line and the gate signals G2 to G4 are ANDed by AND circuits AND 2 to 4 and the terminal part of correction output corresponding to pulse widths is determined. Further, the output D2 to D4 of the AND circuit AND 2 to AND 4 and the input digital signal D1 are ORed by a OR circuit OR, the start end part and the terminal part of the correction output are determined and the correction output in accordance with the pulse width is outputted. |
