| 摘要 |
A video contour correction system for a video display unit consists of an auxiliary deflection coil having its coil axis parallel with the axis of the horizontal deflection coil of the cathode-ray tube, a differentiating circuit for detecting the primary differential waveform of a video signal and an amplification circuit for amplifying the output of the differentiating circuit. The output current of the amplification circuit is supplied to the auxiliary deflection coil so that the magnetic field produced by said auxiliary deflection coil is superposed on the horizontal deflection magnetic field produced by said horizontal deflection coil, thereby improving the border contrast of the picture.
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