JPH01167779U - - Google Patents
Info
- Publication number
- JPH01167779U JPH01167779U JP6483888U JP6483888U JPH01167779U JP H01167779 U JPH01167779 U JP H01167779U JP 6483888 U JP6483888 U JP 6483888U JP 6483888 U JP6483888 U JP 6483888U JP H01167779 U JPH01167779 U JP H01167779U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- oscillation
- burst
- video signal
- 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
- Processing Of Color Television Signals (AREA)
Description
第１図は本考案の一実施例を示す回路図、及び
第２図は従来の二画面ＴＶ受像機に用いられた映
像信号処理回路を示す回路図である。
１５……バーストゲート回路、１７……ＡＣＣ
検波回路、１８……第１平滑回路、１９……第１
コンパレータ、２１……発振回路、２５……モー
ド切換スイツチ、２７……ＡＣＣ回路、２８……
第１位相比較回路、３０……第２位相比較回路、
３２……第２コンパレータ、３５……制御端子。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a video signal processing circuit used in a conventional dual-screen TV receiver. 15...Burst gate circuit, 17...ACC
Detection circuit, 18...first smoothing circuit, 19...first
Comparator, 21...Oscillation circuit, 25...Mode selection switch, 27 ...ACC circuit, 28...
First phase comparison circuit, 30... second phase comparison circuit,
32...Second comparator, 35...Control terminal.
Claims (1)
映像信号のクロマ信号との同期をとる為の映像信
号処理回路であつて、親画面用映像信号のクロマ
レベルを制御するＡＣＣ回路と、該ＡＣＣ回路か
ら得られる利得制御信号のレベル検波を行なうレ
ベル検波回路と、前記ＡＣＣ回路からのクロマ信
号中のバースト信号を抽出するバーストゲート回
路と、制御信号に応じてスイツチが切換わり、発
振周波数が固定型と可変型に切換えられる発振回
路と、該発振回路の発振出力信号と前記バースト
ゲート回路からのバースト信号との位相比較を行
ないその差に応じて前記発振回路を制御する第１
位相比較回路と、前記バーストゲート回路からの
バースト信号と前記発振回路の発振出力信号とを
位相比較する第２位相比較回路と、該第２位相比
較回路の出力信号を平滑する平滑回路とから成り
、前記レベル検波回路の検波出力又は前記平滑回
路の出力信号に応じて前記スイツチを切換え前記
発振回路を発振周波数固定型に切換えたことを特
徴とする映像信号処理回路。 (2) 親画面用映像信号のクロマ信号と子画面用
映像信号のクロマ信号との同期をとる為の映像信
号処理回路であつて、親画面用映像信号のクロマ
レベルを制御するＡＣＣ回路と、該ＡＣＣ回路か
らのクロマ信号中のバースト信号を抽出するバー
ストゲート回路と、制御信号に応じてスイツチが
切換わり、発振周波数が固定型と可変型に切換え
られる発振回路と、前記バーストゲート回路から
のバースト信号と前記発振回路の発振出力信号と
の位相比較を行なう位相比較回路と、該位相比較
回路の出力信号を平滑し、前記発振回路の発振周
波数を制御する平滑回路とから成り、外部からの
制御信号に応じて前記スイツチを切換え、前記発
振回路を発振周波数固定型に切換えたことを特徴
とする映像信号処理回路。[Claims for Utility Model Registration] (1) A video signal processing circuit for synchronizing a chroma signal of a video signal for a main screen with a chroma signal of a video signal for a sub-screen, An ACC circuit that controls the level, a level detection circuit that performs level detection of the gain control signal obtained from the ACC circuit, a burst gate circuit that extracts the burst signal from the chroma signal from the ACC circuit, and An oscillation circuit whose oscillation frequency is switched between a fixed type and a variable type by a switch, and a phase comparison between the oscillation output signal of the oscillation circuit and the burst signal from the burst gate circuit, and the oscillation frequency is changed according to the difference. The first to control the circuit
It consists of a phase comparison circuit, a second phase comparison circuit that compares the phases of the burst signal from the burst gate circuit and the oscillation output signal of the oscillation circuit, and a smoothing circuit that smoothes the output signal of the second phase comparison circuit. . A video signal processing circuit, characterized in that the switch is switched in response to the detection output of the level detection circuit or the output signal of the smoothing circuit, and the oscillation circuit is switched to a fixed oscillation frequency type. (2) a video signal processing circuit for synchronizing the chroma signal of the main screen video signal and the chroma signal of the sub-screen video signal, and an ACC circuit that controls the chroma level of the main screen video signal; a burst gate circuit that extracts a burst signal from the chroma signal from the ACC circuit; an oscillation circuit whose oscillation frequency is switched between a fixed type and a variable type according to a control signal; It consists of a phase comparison circuit that compares the phase of the burst signal and the oscillation output signal of the oscillation circuit, and a smoothing circuit that smooths the output signal of the phase comparison circuit and controls the oscillation frequency of the oscillation circuit. A video signal processing circuit characterized in that the switch is switched in accordance with a control signal, and the oscillation circuit is switched to a fixed oscillation frequency type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6483888U JPH01167779U (en) | 1988-05-17 | 1988-05-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6483888U JPH01167779U (en) | 1988-05-17 | 1988-05-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01167779U true JPH01167779U (en) | 1989-11-27 |
Family
ID=31290294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6483888U Pending JPH01167779U (en) | 1988-05-17 | 1988-05-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01167779U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62219877A (en) * | 1986-03-20 | 1987-09-28 | Sanyo Electric Co Ltd | External synchronizing circuit |
| JPS62266994A (en) * | 1986-05-14 | 1987-11-19 | Mitsubishi Electric Corp | Color video signal synthesizing device |
-
1988
- 1988-05-17 JP JP6483888U patent/JPH01167779U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62219877A (en) * | 1986-03-20 | 1987-09-28 | Sanyo Electric Co Ltd | External synchronizing circuit |
| JPS62266994A (en) * | 1986-05-14 | 1987-11-19 | Mitsubishi Electric Corp | Color video signal synthesizing device |
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