JPH01129972U - - Google Patents
Info
- Publication number
- JPH01129972U JPH01129972U JP1988026075U JP2607588U JPH01129972U JP H01129972 U JPH01129972 U JP H01129972U JP 1988026075 U JP1988026075 U JP 1988026075U JP 2607588 U JP2607588 U JP 2607588U JP H01129972 U JPH01129972 U JP H01129972U
- Authority
- JP
- Japan
- Prior art keywords
- video
- signal
- circuit
- output
- voltage
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
Description
第１図は本考案の実施例に基づく映像信号検出
回路図、第２図は同じく本考案の実施例に基づく
カラーバツク送出装置の回路ブロツク図である。
図中、１……複合同期信号入力端子、２……積
分器、３……コンパレータ、４……ＯＲゲード、
５……ビデオミユート信号入力端子、６……映像
信号検出出力端子、７……制御回路部、８……オ
ンスクリーン回路部、９……カラーバツク出力端
子、Ｒ１，Ｒ２，Ｒ３……抵抗器、Ｃ……コンデ
ンサ、ＩＣ……比較器である。
FIG. 1 is a video signal detection circuit diagram based on an embodiment of the present invention, and FIG. 2 is a circuit block diagram of a color back sending device also based on an embodiment of the present invention. In the figure, 1...Composite synchronization signal input terminal, 2...Integrator, 3...Comparator, 4...OR gate,
5... Video mute signal input terminal, 6... Video signal detection output terminal, 7... Control circuit section, 8... On-screen circuit section, 9... Color back output terminal, R1, R2, R3... Resistor, C ...Capacitor, IC...Comparator.
Claims (1)
路により映像信号から分離した複合同期信号を取
り込む複合同期信号入力端子と、該複合同期信号
を直流電圧に変換する積分器と、該積分器により
変換送出された直流電圧を＋Ｂ電源とアース回路
間に結合した分圧抵抗器の出力基準電圧と比較し
送出する比較器とで成るコンパレータと、該コン
パレータにより映像信号の有無を検出した判別信
号と別のビデオミユート信号端子を経由した映像
信号出力制御信号との論理和をとつて映像出力信
号の有無を検出するＯＲゲート回路と、該ＯＲゲ
ート回路の出力信号を送出する映像信号検出出力
端子とで成ることを特徴とする映像信号検出回路
。 (2) 映像記録・再生装置において、請求項１記
載の映像信号検出回路と、該映像信号検出回路か
ら送出される映像出力信号の有無に関する出力信
号を受けて作動する制御回路部と、該制御回路部
からの指令により予め用意された映像信号を送出
するオンスクリーン回路部と、映像出力端子とで
成るカラーバツク送出装置。[Claims for Utility Model Registration] (1) In a video recording/playback device, a composite synchronization signal input terminal that receives a composite synchronization signal separated from a video signal by a synchronization separation circuit, and an integral that converts the composite synchronization signal into a DC voltage. and a comparator that compares the DC voltage converted and sent out by the integrator with the output reference voltage of the voltage dividing resistor connected between the +B power supply and the ground circuit and sends out the voltage. An OR gate circuit that detects the presence or absence of a video output signal by calculating the logical sum of the determination signal whose presence has been detected and a video signal output control signal passed through another video mute signal terminal, and transmits an output signal of the OR gate circuit. A video signal detection circuit comprising a video signal detection output terminal. (2) In a video recording/reproducing device, the video signal detection circuit according to claim 1; a control circuit section that operates in response to an output signal regarding the presence or absence of a video output signal sent from the video signal detection circuit; A color back sending device consisting of an on-screen circuit section that sends out a video signal prepared in advance according to a command from the circuit section, and a video output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988026075U JPH0722940Y2 (en) | 1988-02-29 | 1988-02-29 | Color back sending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988026075U JPH0722940Y2 (en) | 1988-02-29 | 1988-02-29 | Color back sending device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01129972U true JPH01129972U (en) | 1989-09-05 |
| JPH0722940Y2 JPH0722940Y2 (en) | 1995-05-24 |
Family
ID=31247370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988026075U Expired - Lifetime JPH0722940Y2 (en) | 1988-02-29 | 1988-02-29 | Color back sending device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722940Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200706053A (en) * | 2005-07-27 | 2007-02-01 | Mitac Technology Corp | Audio process circuit structure and process method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5696779U (en) * | 1979-12-24 | 1981-07-31 | ||
| JPS617182U (en) * | 1984-06-20 | 1986-01-17 | 株式会社東芝 | Recording disc playback device |
-
1988
- 1988-02-29 JP JP1988026075U patent/JPH0722940Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5696779U (en) * | 1979-12-24 | 1981-07-31 | ||
| JPS617182U (en) * | 1984-06-20 | 1986-01-17 | 株式会社東芝 | Recording disc playback device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0722940Y2 (en) | 1995-05-24 |
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