| 摘要 |
The present invention relates to a horizontal focus controlling apparatus which compensates for a distortion generated on a screen of a computer or a TV set. The apparatus includes select signal generating means for dividing the period of a sawtooth signal into a falling portion, a rising portion located before the central point of the positive pulse of a flyback pulse signal, and a rising portion after the central point of the positive pulse of the flyback pulse signal and generating first, second, and third select signals synchronized with the respective portions and parabola signal generating means for generating a parabola signal which is synchronized with the flyback pulse signal by controlling the sawtooth signal according to the selections of the first, second, or third select signals.
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