| 摘要 |
PURPOSE:To correct a vertical resolution in a double speed transformation without narrowing the band of a luminance signal by limiting the band of a correcting signal formed from the two luminance signals different in the band. CONSTITUTION:Double speed luminance signals Y5, -Y6 respectively inputted to transistors 18, 19 are added through resistances 25, 26. This addition signal has only the double writing of the double speed taken out by a blanking circuit 16 constituted of an electrolytic capacitor 29 and a transistor 22 to adjust an amplitude by the division of the resistances 25-27, further, a capacitor 32 is connected in parallel to this resistance 27, thereby, the high frequency part component of the correcting signal D2 is deteriorated. Thereby, even when the difference between the double speed luminance signal Y5 and the correcting signal D2 is taken by a differential amplifier constituted of the transistors 20, 21 and a resistance 28 and a constant current source 30, the vertical resolution can be corrected without narrowing the band of the luminance signal.
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