JPS54107213A - Video signal gain control system - Google Patents
Video signal gain control systemInfo
- Publication number
- JPS54107213A JPS54107213A JP1338078A JP1338078A JPS54107213A JP S54107213 A JPS54107213 A JP S54107213A JP 1338078 A JP1338078 A JP 1338078A JP 1338078 A JP1338078 A JP 1338078A JP S54107213 A JPS54107213 A JP S54107213A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signals
- level
- white
- circuits
- 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
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To obtain a good-variable density level and good-distinction pitcture by setting the white level value and the black level value of output video signals well when pictures which were subjected to pulse pickup intermittently are line-scanned and outputted.
CONSTITUTION: Signals picked up by pickup init 11 and outputted by line scanning are supplied to AGC circuit 13 through amplifier 12, and this output signal is inputted to ABL (auto black level control) circuit 17. A part of output signals of circuits 13 and 17 is supplied to SH (sample hold) circuits 14 and 15 respectively, and circuits 14 and 15 are operated by sampling signals from timing control circuit 16 which is operated by the input of synchronizing signals from unit 11 and obtains the average value of black and white signals obtained by scanning in regions A and B and holds this value until a picture is scanned throughout one field. The white level signal held in circuit 14 is applied to circuit 13 as a white level setting control signal, and circuit 17 inputs the black level signal held in circuit 15 as a black level setting control signal, thereby controlling the gain level of following video signals.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53013380A JPS6017194B2 (en) | 1978-02-10 | 1978-02-10 | Video signal gain adjustment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53013380A JPS6017194B2 (en) | 1978-02-10 | 1978-02-10 | Video signal gain adjustment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54107213A true JPS54107213A (en) | 1979-08-22 |
| JPS6017194B2 JPS6017194B2 (en) | 1985-05-01 |
Family
ID=11831481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53013380A Expired JPS6017194B2 (en) | 1978-02-10 | 1978-02-10 | Video signal gain adjustment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6017194B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778161U (en) * | 1980-10-29 | 1982-05-14 | ||
| JPS61126671U (en) * | 1985-01-24 | 1986-08-08 | ||
| JPS62117481A (en) * | 1985-11-15 | 1987-05-28 | Sanyo Electric Co Ltd | Brightness adjusting circuit |
| US4862286A (en) * | 1986-11-14 | 1989-08-29 | Canon Kabushiki Kaisha | Image reading apparatus which adjusts image signals to improve signal balance |
| WO2008149264A2 (en) * | 2007-06-08 | 2008-12-11 | Arcelik Anonim Sirketi | A receiver and a control method |
-
1978
- 1978-02-10 JP JP53013380A patent/JPS6017194B2/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778161U (en) * | 1980-10-29 | 1982-05-14 | ||
| JPS61126671U (en) * | 1985-01-24 | 1986-08-08 | ||
| JPS62117481A (en) * | 1985-11-15 | 1987-05-28 | Sanyo Electric Co Ltd | Brightness adjusting circuit |
| US4862286A (en) * | 1986-11-14 | 1989-08-29 | Canon Kabushiki Kaisha | Image reading apparatus which adjusts image signals to improve signal balance |
| WO2008149264A2 (en) * | 2007-06-08 | 2008-12-11 | Arcelik Anonim Sirketi | A receiver and a control method |
| WO2008149264A3 (en) * | 2007-06-08 | 2010-07-15 | Arcelik Anonim Sirketi | A receiver and a control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6017194B2 (en) | 1985-05-01 |
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