JPS5866770U - Video gain control circuit - Google Patents
Video gain control circuitInfo
- Publication number
- JPS5866770U JPS5866770U JP16096081U JP16096081U JPS5866770U JP S5866770 U JPS5866770 U JP S5866770U JP 16096081 U JP16096081 U JP 16096081U JP 16096081 U JP16096081 U JP 16096081U JP S5866770 U JPS5866770 U JP S5866770U
- Authority
- JP
- Japan
- Prior art keywords
- control circuit
- gain control
- comparison
- video signal
- video
- 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
- Picture Signal Circuits (AREA)
- Television Receiver Circuits (AREA)
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
第１図は本考案に係る映像利得制御回路の実施例を示す
回路図、第２図は本考案の他の実施例を示す回路図であ
る。
１・・・入力端子、２・・・ペデスタルクランプ回路、
３・・・直流利得制御回路、４・・・出力端子、５・・
・比較器、６・・・比較用電圧発生器、７・・・ローパ
スフィルター回路、８・・・映像色信号分離回路、９・
・・色信号除去回路。FIG. 1 is a circuit diagram showing an embodiment of a video gain control circuit according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment of the present invention. 1...Input terminal, 2...Pedestal clamp circuit,
3... DC gain control circuit, 4... Output terminal, 5...
・Comparator, 6... Comparison voltage generator, 7... Low pass filter circuit, 8... Video color signal separation circuit, 9.
...Color signal removal circuit.
Claims (2)
でクランプするクランプ回路と、このクランプされた映
像信号の利得制御を行う直流利得制御回路と、ペデスタ
ルレベルの基準となる比較用電圧を発生する比較用電圧
発生器と、映像信号のペデスタルレベルと上記比較用基
準電圧と比較し、その比較出力をフィルター回路を介し
て上記直流利得制御回路に入力するようにした比較器と
を具備し、上記比較器は映像信号のペデスタルレベルが
比較用基準電圧と同一になるまで直流利得制御回路の利
得を制御するようにしたことを特徴とする映像利得制御
回路。(1) A clamp circuit that clamps the video signal at a pedestal level with a predetermined DC reproduction rate, a DC gain control circuit that controls the gain of this clamped video signal, and a comparison voltage that is used as a reference for the pedestal level. A comparison voltage generator, and a comparator configured to compare the pedestal level of the video signal with the comparison reference voltage and input the comparison output to the DC gain control circuit via the filter circuit, A video gain control circuit characterized in that the comparator controls the gain of the DC gain control circuit until the pedestal level of the video signal becomes the same as the reference voltage for comparison.
期信号の先端レベルがクランプされた映像信号の同期信
号先端レベルと、同期信号の先端レベルの比較用基準電
圧とを比較することを特徴と゛ する実用新案登録請求
の範囲第１項記載の映像利得制御回路。(2) The comparator is characterized in that it compares the leading edge level of the synchronizing signal of the video signal, which has been clamped by the clamping circuit, with a reference voltage for comparison of the leading level of the synchronizing signal. A video gain control circuit as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16096081U JPS5866770U (en) | 1981-10-30 | 1981-10-30 | Video gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16096081U JPS5866770U (en) | 1981-10-30 | 1981-10-30 | Video gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5866770U true JPS5866770U (en) | 1983-05-06 |
Family
ID=29953346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16096081U Pending JPS5866770U (en) | 1981-10-30 | 1981-10-30 | Video gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5866770U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62190977A (en) * | 1986-02-17 | 1987-08-21 | Sony Corp | Automatic level control circuit |
-
1981
- 1981-10-30 JP JP16096081U patent/JPS5866770U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62190977A (en) * | 1986-02-17 | 1987-08-21 | Sony Corp | Automatic level control circuit |
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