JPH0338972U - - Google Patents
Info
- Publication number
- JPH0338972U JPH0338972U JP9834989U JP9834989U JPH0338972U JP H0338972 U JPH0338972 U JP H0338972U JP 9834989 U JP9834989 U JP 9834989U JP 9834989 U JP9834989 U JP 9834989U JP H0338972 U JPH0338972 U JP H0338972U
- Authority
- JP
- Japan
- Prior art keywords
- level
- luminance signal
- output
- pass filter
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図及び第２図はこの考案の一実施例を示す
もので、第１図は回路構成を示すブロツク図、第
２図は第１図のハイパスフイルタによる輝度信号
Ｙのレベル変動を例示する図、第３図は従来のア
ナログのオートコントラスト回路の構成を示すブ
ロツク図である。
１１，２３……乗算器、１２……反転アンプ、
１３……ローパスフイルタ、２１……ハイパスフ
イルタ、２２……Ａ／Ｄ変換器、２４……ラツチ
回路。
Figures 1 and 2 show an embodiment of this invention, with Figure 1 being a block diagram showing the circuit configuration, and Figure 2 illustrating level fluctuations in the luminance signal Y caused by the high-pass filter in Figure 1. 3 are block diagrams showing the configuration of a conventional analog autocontrast circuit. 11, 23...multiplier, 12...inverting amplifier,
13...Low pass filter, 21...High pass filter, 22...A/D converter, 24...Latch circuit.
Claims (1)
ベルが一定値となるよう前記ビデオ信号をレベル
変動させるハイパスフイルタと、 このハイパスフイルタの出力するレベル変動さ
れた輝度信号Ｙをデジタル値に変換するＡ／Ｄ変
換器と、 このＡ／Ｄ変換器の出力する輝度信号からペデ
スタルレベルを検出する検出手段と、 この検出手段によるペデスタルレベルに応じた
乗数により上記Ａ／Ｄ変換器の出力を乗算して増
減する乗算器と を具備したことを特徴とするオートコントラスト
回路。[Claims for Utility Model Registration] A high-pass filter that varies the level of a video signal so that the average level of the luminance signal in the analog value video signal is a constant value; and a luminance signal Y whose level is varied to be output from the high-pass filter. an A/D converter that converts the luminance signal into a digital value; a detection means that detects the pedestal level from the luminance signal output from the A/D converter; and a multiplier according to the pedestal level by the detection means to perform the A/D conversion. An auto-contrast circuit characterized by comprising a multiplier that increases or decreases the output of the device by multiplying it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9834989U JPH0338972U (en) | 1989-08-23 | 1989-08-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9834989U JPH0338972U (en) | 1989-08-23 | 1989-08-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0338972U true JPH0338972U (en) | 1991-04-15 |
Family
ID=31647453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9834989U Pending JPH0338972U (en) | 1989-08-23 | 1989-08-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338972U (en) |
-
1989
- 1989-08-23 JP JP9834989U patent/JPH0338972U/ja active Pending
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