| 摘要 |
PURPOSE:To display a faulty position of a video disk, on a cathode ray tube, by supplying a fault signal such as drop-out, a tracking error, etc. as a luminance signal. CONSTITUTION:A rotary synchronizing signal O generated at every rotation of a video disk is made a sine wave signal R by a voltage control sine wave generator 5, is multiplied 9 by a read position detecting signal T, and becomes a sine signal S corresponding to the radius on the desk. Also, the sine signal S becomes a cosine signal C by a phase difference 10 of 90 deg.. A cathode ray tube 16 draws a circle having a radius corresponding to the read position by inputting these signals as X and Y deflecting signals. When a signal selective switch 15 is switched and a drop-out signal D or a tracking error signal K is supplied to the cathode ray tube 16 as a luminance signal, a distribution of a faulty part is displayed. |
