JPS6333272U

JPS6333272U -

Info

Publication number: JPS6333272U
Application number: JP12584586U
Authority: JP
Priority date: 1986-08-20
Filing date: 1986-08-20
Publication date: 1988-03-03

Description

[Brief explanation of the drawing]

第１図は本考案のリミツタ回路の一実施例のブ
ロツク図、第２図Ａは黒ピークレベルが基準レベ
ルより大きいＴＶ信号を説明するための波形図、
第２図Ｂは、第２図ＡのＴＶ信号のコントラスト
ＡＢＬ５の出力波形図、第２図Ｃは黒ピークレベ
ルが基準レベルより小さいＴＶ信号を説明するた
めの波形図、第２図Ｄは、第２図ＣのＴＶ信号の
輝度ＡＢＬ４の出力波形図である。１……黒ピーク検出回路、２……比較制御回路
、３……基準電圧発生回路、４……輝度ＡＢＬ、
５……コントラストＡＢＬ、６……ビーム電流検
出回路。 FIG. 1 is a block diagram of one embodiment of the limiter circuit of the present invention, FIG. 2A is a waveform diagram for explaining a TV signal in which the black peak level is higher than the reference level,
FIG. 2B is an output waveform diagram of the contrast ABL5 of the TV signal in FIG. 2A, FIG. 2C is a waveform diagram for explaining a TV signal whose black peak level is smaller than the reference level, and FIG. 2C is an output waveform diagram of the brightness ABL4 of the TV signal in FIG. 2C. FIG. 1...Black peak detection circuit, 2...Comparison control circuit, 3...Reference voltage generation circuit, 4...Brightness ABL,
5...Contrast ABL, 6...Beam current detection circuit.

Claims

[Claims for Utility Model Registration] A beam current detector that detects the intensity of the beam current flowing through the cathode ray tube, brightness ABL, and contrast A
The limiter circuit that has a BL and controls the beam current includes: a black peak detection circuit that receives a video signal and detects the blackest level of the input signal; and a black peak detection circuit that detects the blackest level of the input signal;
A limiter circuit comprising a comparison control circuit that selectively and preferentially operates L and contrast ABL.