FH CORRECTION CIRCUIT

摘要

PURPOSE:To realize an fH correction circuit of simple constitution by providing a means for detecting a change of a tracking error signal and a means for controlling a rotating speed of a rotating head based on the change and correcting the rotating speed of the rotating head based on the change of this tracking error signal. CONSTITUTION:The rotating speed VH of a head motor 2 is converted into a voltage by an F/V converting circuit 4. The output of this f/V converting circuit 4 is impressed to a comparison circuit 5. A correction speed reference voltage V2 is impressed to the comparison circuit 5 from a horizontal synchroniz ing signal frequency fH correction circuit 6. In the fH correction circuit 6, a speed reference voltage V1 during an ordinary time is impressed to an end of a resistance R and the tracking error signal Ev is impressed to an end of a capacitor C. The voltage at the connecting point of the resistance R and the capacitor C is the correction speed reference voltage V2. The head rotating speed VH can be represented by KV2 and the V2 can be represented by an expression I, so that the head rotating speed can be corrected by using the tracking error signal Ev.