JPH0361784U - - Google Patents
Info
- Publication number
- JPH0361784U JPH0361784U JP12285189U JP12285189U JPH0361784U JP H0361784 U JPH0361784 U JP H0361784U JP 12285189 U JP12285189 U JP 12285189U JP 12285189 U JP12285189 U JP 12285189U JP H0361784 U JPH0361784 U JP H0361784U
- Authority
- JP
- Japan
- Prior art keywords
- gain
- gain control
- output
- control
- range
- 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
Landscapes
- Processing Of Color Television Signals (AREA)
Description
第１図は本考案の実施例に係るオートホワイト
バランス回路を示すブロツク図である。
１，２……入力端子、３ａ，３ｂ……ピーク検
波回路、４……比較回路、５……Ｕ／Ｄカウンタ
、６……Ｄ／Ａコンバータ、７，１０……スイツ
チ、８……微分回路、９……ラツチ回路、１１…
…プログラマブルゲインアンプ、１２……ゲイン
コントロールアンプ、１３……クロツク入力端子
、１４，１５……映像出力端子。
FIG. 1 is a block diagram showing an auto white balance circuit according to an embodiment of the present invention. 1, 2...Input terminal, 3a, 3b...Peak detection circuit, 4...Comparison circuit, 5...U/D counter, 6...D/A converter, 7, 10...Switch, 8...Differential Circuit, 9... Latch circuit, 11...
...Programmable gain amplifier, 12...Gain control amplifier, 13...Clock input terminal, 14, 15...Video output terminal.
Claims (1)
増幅手段と、この利得制御増幅手段の出力と基準
信号とを比較する信号比較手段と、この信号比較
手段の出力に基づいて前記利得制御増幅手段の利
得を制御する利得制御手段と、前記信号比較手段
の出力が前記利得制御手段の制御範囲を超えてい
ることを検出し前記利得制御手段の制御範囲を切
替える利得範囲切替手段とを有することを特徴と
するオートホワイトバランス回路。 (2) 第１の色信号を増幅する利得制御増幅手段
と、この利得制御増幅手段の出力と第２の色信号
とを比較する信号比較手段と、この信号比較手段
の出力に基づいて前記利得制御増幅手段の利得を
制御する利得制御手段と、前記信号比較手段の出
力が前記利得制御手段の制御範囲を超えているこ
とを検出し前記利得制御手段の制御範囲を切替え
る利得範囲切替手段とを有することを特徴とする
オートホワイトバランス回路。[Claims for Utility Model Registration] (1) Gain control amplification means for amplifying an input signal containing color information, signal comparison means for comparing the output of this gain control amplification means and a reference signal, and gain control means for controlling the gain of the gain control amplification means based on the output; and detecting that the output of the signal comparison means exceeds the control range of the gain control means and switching the control range of the gain control means. An auto white balance circuit comprising gain range switching means. (2) gain control amplification means for amplifying the first color signal; signal comparison means for comparing the output of the gain control amplification means with the second color signal; gain control means for controlling the gain of the control amplification means; and gain range switching means for detecting that the output of the signal comparison means exceeds the control range of the gain control means and switching the control range of the gain control means. An auto white balance circuit characterized by having.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12285189U JPH0361784U (en) | 1989-10-20 | 1989-10-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12285189U JPH0361784U (en) | 1989-10-20 | 1989-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0361784U true JPH0361784U (en) | 1991-06-17 |
Family
ID=31670849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12285189U Pending JPH0361784U (en) | 1989-10-20 | 1989-10-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0361784U (en) |
-
1989
- 1989-10-20 JP JP12285189U patent/JPH0361784U/ja active Pending