| 摘要 |
PURPOSE:To reproduce a disk with the constant line velocity by detecting the deviation of a maximum or minimum reversing interval from a reference value and using the result as information so as to apply drive control. CONSTITUTION:A reproducing signal Sp is fed to one input terminal from an input terminal 1 and a reference voltage Vr is fed to the other input terminal of the limiter 2, and output signals S01, S02 having opposite phase to each other are generated. The one signal S01 is in phase to the signal Sp from the terminal 1, extracted at an output terminal 3 and the signals S01, S02 are fed to saw-tooth wave generating circuits 4a, 4b having the same time constant respectively. The saw-tooth waves ST1, ST2 obtained from the circuit 4a, 4b are fed to peak hold circuits 5a, 5b, output voltages Vd1, Vd2 are fed to a subtraction circuit 6, the subtraction output is fed to a voltage generating circuit 7, from which the reference voltage Vr is fed back to the limiter 2.
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