JPH0193889U - - Google Patents
Info
- Publication number
- JPH0193889U JPH0193889U JP18872687U JP18872687U JPH0193889U JP H0193889 U JPH0193889 U JP H0193889U JP 18872687 U JP18872687 U JP 18872687U JP 18872687 U JP18872687 U JP 18872687U JP H0193889 U JPH0193889 U JP H0193889U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- video signal
- burst signal
- correction circuit
- outputs
- 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
- 238000000605 extraction Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 1
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Description
第１図は本考案による映像信号補正回路のブロ
ツク図、第２図は同じくバースト信号抽出回路の
詳細ブロツク図、第３図は従来の映像信号補正回
路のブロツク図、第４図は各チヤンネルにおける
中間周波信号特性の説明図、第５図は第４図の各
特性に対応する映像信号周波数特性の説明図であ
る。
３……高入力インピーダンス増幅器、５……定
Ｋ型ローパスフイルタ、６……バースト信号抽出
回路、８……直流化回路、ＶＤ……可変容量ダイ
オード。
Fig. 1 is a block diagram of a video signal correction circuit according to the present invention, Fig. 2 is a detailed block diagram of a burst signal extraction circuit, Fig. 3 is a block diagram of a conventional video signal correction circuit, and Fig. 4 is a block diagram of a video signal correction circuit according to the present invention. An explanatory diagram of intermediate frequency signal characteristics. FIG. 5 is an explanatory diagram of video signal frequency characteristics corresponding to each characteristic of FIG. 4. 3...High input impedance amplifier, 5...Constant K type low pass filter, 6...Burst signal extraction circuit, 8...Direct current conversion circuit, VD...Variable capacitance diode.
Claims (1)
ーパスフイルタに複合映像信号を入力して色副搬
送波のレベルを増大して出力する映像信号補正回
路であつて、前記ローパスフイルタを構成する静
電容量の少なくとも一部を可変容量ダイオードで
構成し、前記映像信号補正回路の出力端からバー
スト信号を抽出するバースト信号抽出回路と、前
記抽出したバースト信号をそのレベルに応じた直
流電圧に変換して出力する直流化回路とを備え、
前記直流電圧を前記可変容量ダイオードに逆バイ
アス電圧として加えたことを特徴とする映像信号
補正回路。 A video signal correction circuit that inputs a composite video signal to a constant-K type low-pass filter connected to a high-impedance load, increases the level of a color subcarrier, and outputs it, the circuit comprising: a burst signal extraction circuit that is configured at least in part by a variable capacitance diode and extracts a burst signal from the output end of the video signal correction circuit; and a burst signal extraction circuit that converts the extracted burst signal into a DC voltage according to its level and outputs it. Equipped with a DC converter circuit,
A video signal correction circuit characterized in that the DC voltage is applied to the variable capacitance diode as a reverse bias voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18872687U JPH0193889U (en) | 1987-12-11 | 1987-12-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18872687U JPH0193889U (en) | 1987-12-11 | 1987-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0193889U true JPH0193889U (en) | 1989-06-20 |
Family
ID=31479799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18872687U Pending JPH0193889U (en) | 1987-12-11 | 1987-12-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0193889U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51118321A (en) * | 1975-04-11 | 1976-10-18 | Hitachi Ltd | Automatic frequency character controlled circuit for color tv set |
-
1987
- 1987-12-11 JP JP18872687U patent/JPH0193889U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51118321A (en) * | 1975-04-11 | 1976-10-18 | Hitachi Ltd | Automatic frequency character controlled circuit for color tv set |