JPH04185193A - Color signal amplifier - Google Patents
Color signal amplifierInfo
- Publication number
- JPH04185193A JPH04185193A JP2317108A JP31710890A JPH04185193A JP H04185193 A JPH04185193 A JP H04185193A JP 2317108 A JP2317108 A JP 2317108A JP 31710890 A JP31710890 A JP 31710890A JP H04185193 A JPH04185193 A JP H04185193A
- Authority
- JP
- Japan
- Prior art keywords
- output
- apl
- control voltage
- color signal
- circuit
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 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 description 1
Landscapes
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は複数のモニター装置に拡大画像等を表示するマ
ルチビジョン装置における色信号増巾回路に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a color signal amplification circuit in a multi-vision device that displays enlarged images and the like on a plurality of monitor devices.
（ロ）従来の技術
第３図は従来のマルチビジョン装置のブロック図を示す
。(b) Prior Art FIG. 3 shows a block diagram of a conventional multi-vision device.
同図において、まず、輝度信号はブライト及びコントラ
スト等の画質調整が施された後、クランプ回路（１）で
ペデスタルクランプが為される。このクランプされた輝
度信号は後述する色信号と共にＡＤ変換器（２）でＡＤ
変換され、処理回路（３）で拡大処理等が行なわれた後
、６個〜１２個のモニター（４）（４）・・・に供給さ
れる。In the figure, first, the luminance signal is subjected to image quality adjustments such as brightness and contrast, and then pedestal clamped by a clamp circuit (1). This clamped luminance signal is converted into an AD converter (2) together with a color signal (described later).
After being converted and subjected to enlargement processing and the like in a processing circuit (3), it is supplied to 6 to 12 monitors (4), (4), and so on.
一方、色信号はカラーボリューム（図示省略）からの固
定の制御電圧により制御される色信号増巾器（５）で増
巾された後、色復調回路（６）で色復調され、前記ＡＤ
変換器（２）に供給される。On the other hand, the color signal is amplified by a color signal amplifier (5) controlled by a fixed control voltage from a color volume (not shown), and then color demodulated by a color demodulation circuit (6).
Converter (2) is supplied.
このように輝度信号と色信号の間に相関関係がないため
、同じ色信号でも輝度信号のＡＰＬ（平均輝度レベル）
が上がると色信号レベルが下がったようにみえ、Ａ、
Ｐ Ｌが下がると色信号レベルが上がったようにみえる
不自然さが生じる。In this way, since there is no correlation between the luminance signal and the color signal, even if the color signal is the same, the APL (average luminance level) of the luminance signal
When A increases, the color signal level appears to decrease;
When P L decreases, an unnatural appearance appears as if the color signal level has increased.
また通常のＴＶ上セツトおいては、特公昭５４−２０４
４号公報に見られるように、ＡＰＬの検出をブラウン管
のビーム電流量を検出して輝度信号及び色信号のレベル
を変化させているが、マルチビジョン装置においては、
複数のモニターを用いるため、ビーム電流によりＡＰＬ
を検出することはできない。In addition, in the regular TV set,
As seen in Publication No. 4, the APL is detected by detecting the beam current amount of the cathode ray tube and changing the levels of the luminance signal and color signal, but in multi-vision equipment,
Since multiple monitors are used, APL can be adjusted by beam current.
cannot be detected.
（ハ）発明が解決しようとする課題
本発明は上述の点に鑑み為されたものであり、マルチビ
ジョン装置においても、ＡＰＬに応じて色信号レベルが
制御できる色信号増巾回路を提供するものである。(c) Problems to be Solved by the Invention The present invention has been made in view of the above points, and provides a color signal amplification circuit that can control the color signal level according to APL even in a multi-vision device. It is.
（ニ）課題を解決するための手段
本発明は複数のモニターに拡大画像を映出してなるマル
チビジョン装置において、
クランプ後の輝度信号の平均輝度レベルを検出する検出
回路と、
所定の制御電圧を発生させる制御電圧発生手段と、
前記制御電圧と前＝己検出回路圧力とを比較する比較手
段と、
この比較手段高力において前記制御電圧の方が前記検出
回路出力よりも大きい時、前記制御を匡により利得が制
御ＩＩ’ａれ、前記検出回路出力の方が前記制御電圧よ
りも大きい時、前記制御電圧に前記検出回路出力を加算
した出力により利得が制御される色信号増巾器とからな
る色信号増巾回路である。(d) Means for Solving the Problems The present invention provides a multi-vision device that displays enlarged images on a plurality of monitors, and includes a detection circuit that detects the average luminance level of a luminance signal after clamping, and a predetermined control voltage. a control voltage generating means for generating a control voltage; a comparison means for comparing the control voltage with a self-detection circuit pressure; and a comparison means for controlling the control voltage when the control voltage is larger than the detection circuit output at high force. A chrominance signal amplifier whose gain is controlled by a box II'a, and whose gain is controlled by an output obtained by adding the detection circuit output to the control voltage when the detection circuit output is larger than the control voltage. This is a color signal amplification circuit.
（ホ） 作 用
上述の手段により、色信号増巾器は前記制御電圧の方が
前記検出回路出力よりも大きい時、前記制御電圧により
利得が制御され、前記検出回路出力の方が前記制御電圧
よりら大きい時、前記制御電圧に前記検出回路出力を加
算した出力により利ｉりが制御される。(e) Operation By the means described above, the gain of the color signal amplifier is controlled by the control voltage when the control voltage is larger than the detection circuit output, and the detection circuit output is larger than the control voltage. When it is larger than , the gain i is controlled by the output obtained by adding the detection circuit output to the control voltage.
（へ）実施例 以下、図面に従い本発明の一実施例を説明する。(f) Example An embodiment of the present invention will be described below with reference to the drawings.
第１図は本実施例におけるマルチビジョン装置のブロッ
ク図を示し、第２図と同一部分には同一符号を付し説明
を省略する。図中、（７）はクランプ後の輝度信号を積
分してＡＰＬを検出するＡＰＬ検出回路、（８）はこの
ＡＰＬ検出回路出力とカラーボリュームからの制御電圧
とを比較する比較回路、（９）はこの比較回路出力によ
り前記ＡＰＬ検出回路出力を通過させるか否かを制御す
るゲート回路、（１０）：よこのゲート回路出力と前記
制御電圧とを加算して前記色信号増巾器（５）を制御す
る加算回路である。FIG. 1 shows a block diagram of a multi-vision device in this embodiment, and the same parts as in FIG. 2 are denoted by the same reference numerals and the explanation thereof will be omitted. In the figure, (7) is an APL detection circuit that integrates the luminance signal after clamping and detects APL, (8) is a comparison circuit that compares the output of this APL detection circuit with the control voltage from the color volume, and (9) is a gate circuit that controls whether or not to pass the APL detection circuit output based on the comparison circuit output; (10): the chrominance signal amplifier (5) adds the side gate circuit output and the control voltage; This is an adder circuit that controls the
次に、本実施例装置の動作について説明する。Next, the operation of the device of this embodiment will be explained.
まず、クランプ後の輝度信号はＡＰＬ検出回路（７）で
ＡＰＬに応じた直流電圧とされ比較回路（８）にてカラ
ーボリュームからの制御電圧と比較される。そして、比
較の結果、制御電圧の方が大きい時、比較出力は“Ｌ”
でありゲート回路（９）は閉じており、加算回路（１０
）からは制御電圧のみが出力される。First, the clamped luminance signal is converted into a DC voltage according to the APL by the APL detection circuit (7) and compared with the control voltage from the color volume by the comparison circuit (8). As a result of comparison, when the control voltage is larger, the comparison output is “L”
, the gate circuit (9) is closed, and the addition circuit (10
) outputs only the control voltage.
一方、前記制御電圧よりＡＰＬ検出電圧の方が高い時、
比較出力が“Ｈ”となりゲート回路（９）が開いて前記
、Ａ Ｐ Ｌ検出電圧が通過される。そして、前記加算
回路（１０）からは前記制御電圧にＡＰＬ検出電圧が重
畳された電圧が出力される。On the other hand, when the APL detection voltage is higher than the control voltage,
The comparison output becomes "H", the gate circuit (9) is opened, and the APL detection voltage is passed through. Then, the adding circuit (10) outputs a voltage in which the APL detection voltage is superimposed on the control voltage.
即ち、第２図に示す如く、ＡＰＬが低い時は、加算回路
出力は一定であり、色信号出力レベルは一定であるが、
ＡＰＬが高くなり、前記制御電圧よりもＡＰＬ検出電圧
が大きくなると、加算回路出力はＡＰＬに比例して増加
するため色信号出力レベルは大きくなる。That is, as shown in FIG. 2, when the APL is low, the adder circuit output is constant and the color signal output level is constant;
When the APL becomes high and the APL detection voltage becomes larger than the control voltage, the output of the adder circuit increases in proportion to the APL, so that the color signal output level increases.
（ト）発明の効果
上述の如く本発明に依ればマルチビジョン装置において
もＡＰＬに連動して色信号レベルが制御できるため、輝
度と色とのバランスが良好な画像を得ることができる。(g) Effects of the Invention As described above, according to the present invention, the color signal level can be controlled in conjunction with the APL even in a multi-vision device, so an image with a good balance between brightness and color can be obtained.
第１図は本発明の一実施例におけるマルチビジョン装置
のブロック図、第２図は第１図のＡＰＬと加算回路出力
との関係を表わす図である。
第３図は従来のマルチビジョン装置のブロック図である
。
（１） クランプ回路、（２）・・、へＤ変換器、（３
）・・・処理回路、（５）・・・色信号増巾器、（７）
・・・ＡＰ Ｌ検出回路、（８）・・比較回路、（９）
・・・ゲート回路、（１０）・加算回路。FIG. 1 is a block diagram of a multi-vision device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the APL of FIG. 1 and the output of the adder circuit. FIG. 3 is a block diagram of a conventional multi-vision device. (1) Clamp circuit, (2)..., D converter, (3
)...Processing circuit, (5)...Color signal amplifier, (7)
...AP L detection circuit, (8)...Comparison circuit, (9)
...Gate circuit, (10)・Addition circuit.
Claims (1)
ビジョン装置において、 クランプ後の輝度信号の平均輝度レベルを検出する検出
回路と、 所定の制御電圧を発生させる制御電圧発生手段と、 前記制御電圧と前記検出回路出力とを比較する比較手段
と、 この比較手段出力において前記制御電圧の方が前記検出
回路出力よりも大きい時、前記制御電圧により利得が制
御され、前記検出回路出力の方が前記制御電圧よりも大
きい時、前記制御電圧に前記検出回路出力を加算した出
力により利得が制御される色信号増巾器とからなる色信
号増巾回路。(1) A multi-vision device that displays enlarged images on a plurality of monitors, comprising: a detection circuit that detects the average luminance level of a luminance signal after clamping; a control voltage generation means that generates a predetermined control voltage; and the control. a comparison means for comparing a voltage with the output of the detection circuit; when the control voltage is larger than the output of the detection circuit in the output of the comparison means, the gain is controlled by the control voltage, and the output of the detection circuit is higher than the output of the detection circuit; A color signal amplification circuit comprising a color signal amplification circuit whose gain is controlled by an output obtained by adding the detection circuit output to the control voltage when the gain is greater than the control voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2317108A JP3054433B2 (en) | 1990-11-20 | 1990-11-20 | Color signal amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2317108A JP3054433B2 (en) | 1990-11-20 | 1990-11-20 | Color signal amplification circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04185193A true JPH04185193A (en) | 1992-07-02 |
| JP3054433B2 JP3054433B2 (en) | 2000-06-19 |
Family
ID=18084530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2317108A Expired - Fee Related JP3054433B2 (en) | 1990-11-20 | 1990-11-20 | Color signal amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3054433B2 (en) |
-
1990
- 1990-11-20 JP JP2317108A patent/JP3054433B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3054433B2 (en) | 2000-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6373533B1 (en) | Image quality correction circuit for video signals | |
| FI97513B (en) | A dynamic video system that includes automatic contrast and "white stretch" processing blocks | |
| CA2147057C (en) | Reproduction circuit for skin color in video signals | |
| JP2004320632A (en) | Video signal processing circuit, video display unit and method | |
| US5191420A (en) | Video system with feedback controlled "white stretch" processing and brightness compensation | |
| JP3208814B2 (en) | Video signal correction device | |
| JP2764761B2 (en) | Video signal average luminance level detection device | |
| JPH04185193A (en) | Color signal amplifier | |
| JPH0750791A (en) | Video signal processor | |
| JP3407677B2 (en) | Speed modulation circuit | |
| EP0849956B1 (en) | Gamma-correction circuit for blue color video signal in projection television | |
| JP3291767B2 (en) | Multi vision projector | |
| JPH06292220A (en) | Color signal amplitude limiter for video signal | |
| JPH04196769A (en) | Signal processor | |
| JP3029875B2 (en) | Video signal level correction circuit | |
| JPH01298881A (en) | Automatic beam current limiting circuit | |
| JPS58220589A (en) | Color television camera | |
| JPH01212983A (en) | Digital x-ray tv apparatus | |
| JPH0746605A (en) | Signal processing circuit | |
| JPH0530543A (en) | Video signal processor | |
| JPH0530385A (en) | Black level stabilizing circuit | |
| JPS594278A (en) | Blooming preventing device | |
| JPH0265571A (en) | Contour correction device | |
| JPS62269494A (en) | Processing circuit for color video signal of display equipment | |
| JPH0937102A (en) | Crt focus voltage control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |