JPH01117190U - - Google Patents
Info
- Publication number
- JPH01117190U JPH01117190U JP1340988U JP1340988U JPH01117190U JP H01117190 U JPH01117190 U JP H01117190U JP 1340988 U JP1340988 U JP 1340988U JP 1340988 U JP1340988 U JP 1340988U JP H01117190 U JPH01117190 U JP H01117190U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- white balance
- balance adjustment
- adjustment circuit
- detection
- 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 description 10
- 239000002131 composite material Substances 0.000 claims 2
- 230000001629 suppression Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Processing Of Color Television Signals (AREA)
Description
第1図は、本考案の実施例を示すブロツク回路
図、第2図は、従来例を示すブロツク回路図、第
3図は、基準レベル信号を説明するための説明図
である。
主要部分の符号の説明、12……ドライブ調整
回路、13……カツトオフ調整回路、17……電
流検出回路、19……カツトオフ制御回路、20
……利得制御回路、21……基準パルス発生回路
、30……同期信号検出回路、31……テロツプ
信号検出回路。
FIG. 1 is a block circuit diagram showing an embodiment of the present invention, FIG. 2 is a block circuit diagram showing a conventional example, and FIG. 3 is an explanatory diagram for explaining a reference level signal. Explanation of symbols of main parts, 12...Drive adjustment circuit, 13...Cut-off adjustment circuit, 17...Current detection circuit, 19...Cut-off control circuit, 20
...Gain control circuit, 21...Reference pulse generation circuit, 30...Synchronization signal detection circuit, 31...Top signal detection circuit.
Claims (1)
供給する信号中継回路と、前記信号中継回路に所
定間隔の基準レベル信号を与えて前記基準レベル
信号に対する前記信号中継回路の出力レベルを検
出する出力検出手段と、前記出力レベルに基づい
て前記信号中継回路の利得を調整する利得調整手
段とを含むホワイトバランス調整回路であつて、 前記原色信号の不存在を検出すると不存在検出
信号を発生する検出手段と、前記不存在検出信号
に応じて前記利得を抑制するレベル抑制手段とを
含むことを特徴とするホワイトバランス調整回路
。 (2) 前記検出手段は、前記原色信号のレベルに
基づいて前記不存在信号を発生することを特徴と
する請求項1記載のホワイトバランス調整回路。 (3) 前記原色信号はカラーコンポジツトビデオ
信号から抽出され、前記検出手段は、前記カラー
コンポジツトビデオ信号から同期信号を分離して
、該同期信号を所定時間以上に亘つて検出するこ
とが出来ないとき前記不存在信号を発生すること
を特徴とする請求項1記載のホワイトバランス調
整回路。 (4) 前記原色信号はR,G及びB成分信号又は
R,G及びB成分のいずれかと輝度成分との差信
号であることを特徴とする請求項1記載のホワイ
トバランス調整回路。[Claims for Utility Model Registration] (1) A signal relay circuit that amplifies a primary color signal and supplies it to an image display means; A white balance adjustment circuit including an output detection means for detecting an output level of a signal relay circuit, and a gain adjustment means for adjusting a gain of the signal relay circuit based on the output level, the white balance adjustment circuit comprising: A white balance adjustment circuit comprising: detection means that generates an absence detection signal upon detection; and level suppression means that suppresses the gain in response to the absence detection signal. (2) The white balance adjustment circuit according to claim 1, wherein the detection means generates the absence signal based on the level of the primary color signal. (3) The primary color signal is extracted from the color composite video signal, and the detection means is capable of separating a synchronization signal from the color composite video signal and detecting the synchronization signal for a predetermined period of time or more. 2. The white balance adjustment circuit according to claim 1, wherein the non-existence signal is generated when the non-existence signal is present. (4) The white balance adjustment circuit according to claim 1, wherein the primary color signal is an R, G, and B component signal or a difference signal between any one of the R, G, and B components and a luminance component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1340988U JPH01117190U (en) | 1988-02-02 | 1988-02-02 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1340988U JPH01117190U (en) | 1988-02-02 | 1988-02-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01117190U true JPH01117190U (en) | 1989-08-08 |
Family
ID=31223692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1340988U Pending JPH01117190U (en) | 1988-02-02 | 1988-02-02 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01117190U (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6196892A (en) * | 1984-10-18 | 1986-05-15 | Sony Corp | Automatic white balance adjusting circuit |
-
1988
- 1988-02-02 JP JP1340988U patent/JPH01117190U/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6196892A (en) * | 1984-10-18 | 1986-05-15 | Sony Corp | Automatic white balance adjusting circuit |
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