| 摘要 |
PURPOSE:To use the band compensation to a luminance signal in common with the trap operation of a chroma signal, by providing a trap circuit to a luminance signal circuit of a comb line filter and controlling the value of an attenuation control resistance of the trap circuit with a control signal. CONSTITUTION:When a changeover switch 3 is turned on, the 1st and the 2nd switch circuits 4, 5 are turned on and an output of a delay circuit 2 is applied to a subtraction circuit 6 and an adder 8. A trap control switch 10 is turned off, a trap circuit 9 has a set trap attenuation amount and the band compensation to the luminance signal outputted from the adder 8 is attained. In turning off the changeover switch 3, the 1st and the 2nd switch circuits 4, 5 are turned off and the operation as the comb line filter is inoperative. The attenuation amount control resistane of the trap circuit 9 is short-circuited and the trap circuit 9 acts like the trap to a chroma signal. |
