| 摘要 |
PURPOSE:To execute an optimum jitter adjustment, by maximizing the ratio of the number of trailing edges of each pulse produced during a 1st time to the number of trailing edges of each pulse produced during a 2nd time which is shorter than the 1st time. CONSTITUTION:When, for example, the waveform (a) of a reference time 3T is measured out of reproducing pulse train signals hose waveforms are shaped, a waveform (c) detected by a fall detector 6 and a wide-width pulse waveform (d) and narrow-width pulse waveform (e) containing the time of 3T lapsed from the positive pulse corresponding to the leading section detected by a rise detector 7 are added to AND circuits 11 and 12 and numbers n1 and n2 of the waveform (c) contained in the wide and narrow pulses (d) and (e) are measured. A CPU15 calculates the value which indicates the quantity of jitters of the 3T pulses from N=n1-n2/n1. In accordance with the measured results, adjustment is carried out so as to make the jitter of a CD player 1 lowest by means of an adjusting device 19. |
