JITTER MEASURING DEVICE FOR REPRODUCED SIGNAL OF OPTICAL DISK, JITTER MEASURING METHOD FOR REPRODUCED SIGNAL OF OPTICAL DISK, RECORDING AND/OR REPRODUCING DEVICE FOR OPTICAL DISK, AND REPRODUCING METHOD FOR OPTICAL DISK

摘要

PROBLEM TO BE SOLVED: To provide a jitter measuring device for the reproduced signal of an optical disk capable of efficiently measuring a jitter component with a simple circuit structure. ;SOLUTION: The matrix circuit of a characteristic inspecting device l feeds the RF signal to an A/D-converting circuit 6. A computer 8 obtains a slice level from the data of the digitized RF signal. The computer 8 obtains the time when the RF signal becomes the predetermined slice level via interpolation based on the digital data at the sample point near this slice level and the sampling frequency of the A/D-converting circuit 6. The computer 8 obtains the time width between the times when the RF signal becomes the slice level and obtains the jitter component of a reproduced signal based on the time width.;COPYRIGHT: (C)1999,JPO