| 摘要 |
PURPOSE:To prevent the crooking of a longitudinal line and improve the quality on a screen in a video signal recording and reproducing device like a rewritable optical video file device by using a signal showing the phase of the trailing edge of the horizontal synchronizing signal of a reproduced video signal as a time axis phase signal. CONSTITUTION:A time axis variation corrrection system 20 is constituted by using a variable delay element using a CCD22. An output video signal 21 is inputted to a synchronous separating circuit 23 and a composite synchronizing signal 24 is applied to a sample pulse generating circuit 25 to generate sample pulses by using trailing edge information on the horizontal synchronizing signal, so that the pulses are inputted to a phase comparing means 27 through a gate circuit 26. The output of the phase comparing means 27 is impressed as the control voltage of a voltage-controlled oscillator 31 through a processing circuit 30 to control the frequency of the oscillator. The output of the voltage-controlled oscillator 31 is impressed to the CCD22, whose delay time is controlled. Thus, the trailing edge information on the horizontal synchronizing signal is used to detect time axis variation of the output video signal, and the time axis variation of the output video signal 21 is suppressed with detection information. |
