| 摘要 |
<p>PURPOSE: To precisely reproduce data at all times even in the case an error is produced in synchronizing signals by generating interpolated synchronizing signals in the case the error is produced in the synchronizing signal detected form a disk and it is different or not detected. CONSTITUTION: To a synchronization state detection circuit, a clock signal CK and a reset signal MRST are inputted. A normal state detection part 60 receives the interpolated synchronizing signal SYNCINS from a synchronization interpolation circuit and a detection synchronizing signal SYNCDET and generates a state signal OKSY in detecting that both signals are H. A first abnormality detection part 70 generates the state signal NOSY for indicating that the detection signals SYNDET of H is not present within the H section of a window signal WINDOW for the present valid synchronizing signal SYNC. A second abnormal synchronizing signal detection part 80 generates the state signal ILSY for indicating that the signal SYNCDET is present at the outside of the H section of the window signal. The state of the synchronizing signals detected from the disk is discriminated and sent to a control circuit and a data processing is facilitated.</p> |
