JPS6037982U

JPS6037982U - Delay time correction circuit

Info

Publication number: JPS6037982U
Application number: JP12865683U
Authority: JP
Inventors: 正博北浦
Original assignee: 日本ビクター株式会社
Priority date: 1983-08-20
Filing date: 1983-08-20
Publication date: 1985-03-15

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来のくし形フィルタのブロック図、第２図ａ
〜Ｃは第１図に示したくし形フィルタの動作を説明する
ための図、第３図Ａ−Ｄは３水平走査期間の信号を第１
図に示した（し形フィルタに入力した場合の垂直方向へ
の遅延の経過を説明するための図、第４図は本考案にな
る遅延時間補正回路の一実施例のブロック図、第５図Ａ
−Ｅは第４図に示した遅延時間補正回路を説明するため
の図である。１・・・・・・複合映像信号入力端子、２・・・・・・
１水平走査期間（１／ｆＨ）だけ入力信号を遅延する遅
延線、３・・・・・・加算器、４・・・・・・減算器、
５・・・・・・加算器、６・・・・・・輝度（Ｙ）信号
出力端子、７・・・・・・低減通過フィルタ、８・・・
・・・搬送色（Ｃ）信号出力端子、９・・・・・・反転
増幅器、１０・・・・・・スイッチ。Figure 1 is a block diagram of a conventional comb filter, Figure 2a
~C are diagrams for explaining the operation of the comb filter shown in Figure 1, and Figures 3A to 3D are diagrams for explaining the operation of the comb filter shown in Figure 1.
Figure 4 is a block diagram of an embodiment of the delay time correction circuit according to the present invention; A
-E is a diagram for explaining the delay time correction circuit shown in FIG. 4. 1... Composite video signal input terminal, 2...
a delay line that delays an input signal by one horizontal scanning period (1/fH); 3... an adder; 4... a subtracter;
5... Adder, 6... Luminance (Y) signal output terminal, 7... Reduced pass filter, 8...
... Carrier color (C) signal output terminal, 9 ... Inverting amplifier, 10 ... Switch.

Claims

[Scope of utility model registration request]

A composite video signal input terminal into which a composite video signal in which a carrier color signal is superimposed in a luminance signal band in an interleaved relationship is input, and a first input terminal is connected to the composite video signal input terminal. a first adder; a subtracter whose first input terminal is connected to the composite video signal input terminal; the composite video signal input terminal and the second input terminal of the first adder; a delay circuit inserted between the first input terminal and the second input terminal of the first input terminal;
a second adder connected to the output terminal of the adder;
a first output terminal connected to the output terminal of the second adder; and a second output terminal connected to the output terminal of the subtracter.
a low-pass filter connected to the output terminal of the subtractor; an inverting amplifier having an input terminal connected to the low-pass filter; a first fixed terminal connected to the low-pass filter; A second fixed terminal is connected to a connection between the filter and the input terminal of the inverting amplifier, a second fixed terminal is connected to the output terminal of the inverting amplifier, and a movable contact is connected to a second input terminal of the second adder. The switch separates a carrier color signal and a luminance signal from the composite video signal input to the composite video signal input terminal, and separates the carrier color signal and luminance signal from the composite video signal input to the composite video signal input terminal, and separates the carrier color signal and the luminance signal from the composite video signal input to the composite video signal input terminal. A delay time correction circuit configured to selectively change the delay time of the signal output from the second adder using the switch.