| 摘要 |
A disc recording/reproducing system where recording/reproduced data rates change stepwise when spiral record tracks on a disc medium are divided in multiple zones in the radial direction and the disc is rotated and driven at a constant angular velocity or when a rotating and driving angular velocity changes stepwise for every zone, the disc recording/reproducing system is provided with a data rate control area provided at the boundary between a first and second zones on the disc medium for controlling the recording/reproduced data rate, a control area detecting device for detecting the data rate control area when continuously recording/reproducing data extends over the first and second zones and a frequency controller means for controlling the frequency of a recording/reproducing data extracting PLL or a recording reference frequency generating PLL when the data rate control area is detected.
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