| 摘要 |
An active convergence correction apparatus for a full color cathode ray tube display of the delta gun shadow mask type wherein the horizontal and vertical parabolic waveshape compensation signals are generated by squaring circuits responsive to the horizontal and vertical deflection signals and wherein zero crossing detectors also responsive to the horizontal and vertical deflection signals, which effectively divide the viewing screen into rectangular coordinates, control switches which split each of the horizontal and vertical parabolic waveshape signals in half, whereby the relative amplitudes of each half can be independently controlled to achieve precise convergence in all sectors of the screen.
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