JPH01160773U - - Google Patents
Info
- Publication number
- JPH01160773U JPH01160773U JP5644788U JP5644788U JPH01160773U JP H01160773 U JPH01160773 U JP H01160773U JP 5644788 U JP5644788 U JP 5644788U JP 5644788 U JP5644788 U JP 5644788U JP H01160773 U JPH01160773 U JP H01160773U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- gamma correction
- constant
- full
- gain switching
- 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
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Picture Signal Circuits (AREA)
Description
第１図は本考案を実施したガンマ補正回路の回
路図である。第２図は従来例の回路図であり、第
３図はその特性図である。第４図は第１図の特性
図である。
２……定電圧回路、７，８……カレントミラー
回路、ＶＲ……定電圧、Ｃ，Ｃ１……フルスケー
ル入力電圧、Ａ，Ｂ，Ｃ，Ａ１，Ｂ１，Ｃ１……
利得切換え点、Ｒ２，Ｒ３……抵抗（インピーダ
ンス素子）、ａ，ｂ……接続点。
FIG. 1 is a circuit diagram of a gamma correction circuit embodying the present invention. FIG. 2 is a circuit diagram of a conventional example, and FIG. 3 is a characteristic diagram thereof. FIG. 4 is a characteristic diagram of FIG. 1. 2... Constant voltage circuit, 7, 8... Current mirror circuit, VR... Constant voltage, C, C1 ... Full scale input voltage, A, B, C, A1 , B1 , C1 ...
Gain switching point, R2 , R3 ...resistance (impedance element), a, b...connection point.
Claims (1)
を扱い得るようになつていると共に、前記フルス
ケール入力電圧に対し複数の利得切換え点を設け
て折れ線近似のガンマ補正特性を得るガンマ補正
回路において、前記所定電圧に対応する定電圧を
出力する定電圧源に順次直列に接続された複数の
インピーダンス素子と、該インピーダンス素子の
接続点と前記定電圧源の出力端との間の電圧を前
記利得切換え点に対応させる手段と、前記インピ
ーダンス素子に、定電流を流す手段と、前記定電
流を可変する手段とを設けたことを特徴とするガ
ンマ補正回路。 In a gamma correction circuit that is capable of handling input from a predetermined voltage to a full-scale input voltage, and that obtains a gamma correction characteristic approximating a polygonal line by providing a plurality of gain switching points for the full-scale input voltage, the predetermined a plurality of impedance elements sequentially connected in series to a constant voltage source that outputs a constant voltage corresponding to the voltage, and a voltage between a connection point of the impedance elements and an output end of the constant voltage source to the gain switching point. A gamma correction circuit comprising: means for matching, means for passing a constant current through the impedance element, and means for varying the constant current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5644788U JPH01160773U (en) | 1988-04-26 | 1988-04-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5644788U JPH01160773U (en) | 1988-04-26 | 1988-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01160773U true JPH01160773U (en) | 1989-11-08 |
Family
ID=31282321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5644788U Pending JPH01160773U (en) | 1988-04-26 | 1988-04-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01160773U (en) |
-
1988
- 1988-04-26 JP JP5644788U patent/JPH01160773U/ja active Pending