| 摘要 |
PURPOSE:To allow detection of cross talk also for a CAV disk by detecting an amplitude fluctuation component of color burst of a reproducing video signal and by detecting cross talk from an adjacent record truck. CONSTITUTION:A reproducing color video signal A is impressed onto a BPF1, and extracts a color burst signal B containing a chroma component. The signal B is supplied to an AM detector 2 and rectified. A rectifier output C is impressed on a sample hold S/H circuit 4 after high frequency components such as color sub-carrier frequency of the rectifier output C are removed. A hold output E is impressed on an LPF6 and its high component is removed. An output F of the LPF6 becomes input of an AM detector 7 and is rectified. A rectifier signal G is impressed on an LPF8, turning into a direct current component H, and becomes cross talk detection output. |
