| 摘要 |
PURPOSE:To save a mixer amplifier and to simplify an aperture correction circuit, by applying a luminance signal to a variable impedance circuit and an aperture compensation signal to a series circuit of variable and fixed impedance. CONSTITUTION:A luminance signal Y2 from an aperture compensation signal forming circuit 4 is applied to the base of a transistor (TR)Q11 constituting an aperture compensation circuit 6 without a mixer amplifier and the collector of the TRQ11 and the base of a TRQ12 are connected via a resistor R15. A series circuit of a TRQ13 and a resistor R16 is connected to the base of the TRQ12 and an aperture compensation signal is applied to the base of the TRQ13, then gamma compensation is made to the luminance signal Y2 with the TRs Q11, and TRs Q1-Q3 and resistors R1-R4, R11-R14 and suitable aperture compensation can be made with the Trs Q13 and the like. |
