JPH087750Y2 - Video signal switch circuit - Google Patents

Video signal switch circuit

Info

Publication number
JPH087750Y2
JPH087750Y2 JP11497890U JP11497890U JPH087750Y2 JP H087750 Y2 JPH087750 Y2 JP H087750Y2 JP 11497890 U JP11497890 U JP 11497890U JP 11497890 U JP11497890 U JP 11497890U JP H087750 Y2 JPH087750 Y2 JP H087750Y2
Authority
JP
Japan
Prior art keywords
signal
chroma
selection switch
switch circuit
control 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.)
Expired - Lifetime
Application number
JP11497890U
Other languages
Japanese (ja)
Other versions
JPH0471080U (en
Inventor
由久 三島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP11497890U priority Critical patent/JPH087750Y2/en
Publication of JPH0471080U publication Critical patent/JPH0471080U/ja
Application granted granted Critical
Publication of JPH087750Y2 publication Critical patent/JPH087750Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Studio Circuits (AREA)
  • Color Television Systems (AREA)

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は映像信号のスイッチ回路に関し、特にクロマ
信号に制御信号が重畳された場合にも有効な系を構成し
CTV,AVスイッチャ等に好適ならしめるものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a video signal switch circuit, and particularly forms an effective system even when a control signal is superimposed on a chroma signal.
It is suitable for CTV, AV switcher, etc.

〔従来の技術〕[Conventional technology]

第2図は従来の映像信号のスイッチ回路の構成例を示
すもので、このスイッチ回路は、VIDEO1〜3のS入力端
子Sinにそれぞれコンデンサを介して接続され直流カッ
トして輝度信号Yを出力する輝度信号選択スイッチYSW
と、同様にしてクロマ信号Cを出力するクロマ信号選択
スイッチCSWを備えている。また、S出力端子SOUTには
上記選択スイッチYSWとCSWの出力端間にそれぞれバッフ
ァBYとBCが設けられ、それぞれの出力信号を例えば2倍
に増幅した後出力インピーダンスを整合させコンデンサ
を介して直流カットして送出するようになっている。な
お、ここで、輝度信号Yは広帯域なので、直流カットに
は比較的容量の大きいコンデンサを用いるが、クロマ信
号Cは高域成分のみしか存在しないので低容量のコンデ
ンサを用いている。
FIG. 2 shows an example of the configuration of a conventional video signal switch circuit. This switch circuit is connected to the S input terminals S in of VIDEO 1 to 3 via capacitors and cuts the direct current to output the luminance signal Y. Brightness signal selection switch Y SW
And a chroma signal selection switch C SW for outputting the chroma signal C in the same manner. Further, the S output terminal S OUT is provided with buffers BY and B C between the output terminals of the selection switches Y SW and C SW , respectively, and after amplifying the respective output signals by a factor of 2 to match the output impedance. It is designed to cut the direct current through a capacitor and send it out. Here, since the luminance signal Y has a wide band, a capacitor having a relatively large capacity is used for the direct current cut, but the chroma signal C has a low capacity capacitor because only a high frequency component exists.

〔考案が解決しようとする課題〕[Problems to be solved by the device]

従来例による映像信号のスイッチ回路は以上のような
構成となっているので、クロマ信号Cに直流または低域
の制御信号を重畳して用いる場合には、制御信号はコン
デンサによってスイッチ回路を通過することができな
く、また出力端子SOUTにも出力されないという問題点が
あった。
Since the video signal switch circuit according to the conventional example has the above-described configuration, when the DC signal or the low frequency control signal is superimposed on the chroma signal C and used, the control signal passes through the switch circuit by the capacitor. There was a problem that it was not possible to output and it was not output to the output terminal S OUT .

本考案は上記のような従来例の問題点を解消するため
になされたもので、クロマ信号に含まれる制御信号を取
り出し有効に活用することができる映像信号のスイッチ
回路を提供することを目的とする。
The present invention has been made in order to solve the problems of the conventional example as described above, and an object thereof is to provide a video signal switch circuit that can extract a control signal included in a chroma signal and utilize it effectively. To do.

〔課題を解決するための手段及び作用〕[Means and Actions for Solving the Problems]

上記目的を達成するために、本考案に係る映像信号の
スイッチ回路は、複数のS入力端子のいずれかからそれ
ぞれ輝度信号とクロマ信号を選択出力する輝度信号選択
スイッチとクロマ信号選択スイッチを備えた映像信号の
スイッチ回路において、上記複数のS入力端子に接続さ
れ上記各選択スイッチに連動してクロマ信号に重畳され
た直流電圧を制御信号として選択出力する制御信号選択
スイッチを備えたもので、この制御信号選択スイッチに
よりクロマ信号に重畳された制御信号を取り出す。
To achieve the above object, a video signal switch circuit according to the present invention includes a luminance signal selection switch and a chroma signal selection switch for selectively outputting a luminance signal and a chroma signal from any of a plurality of S input terminals. The video signal switch circuit is provided with a control signal selection switch which is connected to the plurality of S input terminals and which selectively outputs the DC voltage superimposed on the chroma signal as a control signal in association with the selection switches. The control signal selection switch extracts the control signal superimposed on the chroma signal.

また、上記構成の映像信号のスイッチ回路において、
上記制御信号選択スイッチによって選択出力される制御
信号をクロマ信号に重畳してS出力端子に出力する重畳
回路を設けることにより、S出力端子が設けられている
場合にクロマ信号に含まれる制御信号を有効に活用する
系を構成する。
In the video signal switch circuit having the above configuration,
By providing a superimposing circuit that superimposes the control signal selectively output by the control signal selection switch on the chroma signal and outputs the superposed signal to the S output terminal, the control signal included in the chroma signal when the S output terminal is provided is provided. Configure a system for effective use.

〔実施例〕〔Example〕

以下、本考案の一実施例を第1図に基づいて説明す
る、第1図において、VIDEO1〜3の輝度信号・クロマ信
号分離入力端子(以下S入力端子という)Sinには、そ
れぞれコンデンサを介して輝度信号選択スイッチYSW
クロマ信号選択スイッチCSWが接続されると共に、クロ
マ信号Cに重畳された直流または低域の制御信号を選択
出力する制御信号選択スイッチCDCSWが接続され、これ
ら選択スイッチは連動する構成でなり、選択したS入力
端子の輝度信号Y及びクロマ信号Cと共に該クロマ信号
Cに含まれる制御信号が取り出されるようになってい
る。
An embodiment of the present invention will be described below with reference to FIG. 1. In FIG. 1, a luminance signal / chroma signal separation input terminal (hereinafter referred to as S input terminal) S in of VIDEO 1 to 3 has a capacitor respectively. The luminance signal selection switch Y SW and the chroma signal selection switch C SW are connected via the control signal selection switch C DCSW for selectively outputting the DC or low frequency control signal superimposed on the chroma signal C. The selection switch is configured to interlock with each other, and the control signal included in the chroma signal C is taken out together with the luminance signal Y and the chroma signal C of the selected S input terminal.

また、クロマ信号選択スイッチCSWから選択出力され
るクロマ信号CをバッファBC及びコンデンサを介して増
幅した後出力インピーダンスを整合させ直流カットして
S出力端子SOUTに導く経路には、制御信号選択スイッチ
CDCSWから選択出力される制御信号を上記クロマ信号C
に重畳する抵抗Rからなる重畳回路が設けられ、制御信
号の重畳されたクロマ信号CがS出力端子SOUTに出力さ
れるようになっている。なお、輝度信号選択スイッチY
SWから選択出力される輝度信号Yも同様にしてバッファ
BY及びコンデンサを介してS出力端子SOUTに出力され
る。
In addition, after amplifying the chroma signal C selectively output from the chroma signal selection switch C SW via the buffer B C and the capacitor, the output impedance is matched and the direct current is cut to lead to the S output terminal S OUT. Selection switch
The control signal selectively output from C DCSW is the above chroma signal C.
A superposition circuit including a resistance R superposed on the control signal is provided so that the chroma signal C on which the control signal is superposed is output to the S output terminal S OUT . The brightness signal selection switch Y
Similarly, the luminance signal Y selectively output from the SW is also buffered.
It is output to the S output terminal S OUT via B Y and the capacitor.

従って、上記実施例によれば、クロマ信号Cに含まれ
る制御信号を取り出すことができ、また、重畳回路によ
りクロマ信号選択スイッチから選択出力されるクロマ信
号に制御信号を再度重畳してS出力端子に出力すること
ができるようになり、制御信号を重畳した場合に有効な
系を構成することができる。
Therefore, according to the above-described embodiment, the control signal included in the chroma signal C can be taken out, and the control signal is superposed again on the chroma signal selectively output from the chroma signal selection switch by the superimposing circuit to output the S output terminal. It becomes possible to output the signal to the device, and it is possible to configure an effective system when the control signal is superimposed.

〔考案の効果〕[Effect of device]

以上のように、本考案によれば、輝度信号とクロマ信
号の各選択スイッチと共に連動する制御信号選択スイッ
チを設けたので、クロマ信号に含まれる制御信号を取り
出すことができ、制御信号をクロマ信号に重畳している
場合に制御信号を有効に活用できる系を構築できる。
As described above, according to the present invention, since the control signal selection switch that works together with each selection switch for the luminance signal and the chroma signal is provided, the control signal included in the chroma signal can be taken out, and the control signal can be converted to the chroma signal. It is possible to construct a system that can effectively utilize the control signal when it is superposed on.

また、制御信号選択スイッチから選択出力される制御
信号をクロマ信号に再度重畳してS出力端子に出力する
重畳回路を設けることにより、S出力端子が設けられる
スイッチ回路に有効な系を構成する。
Further, by providing a superimposing circuit that re-superimposes the control signal selectively output from the control signal selection switch on the chroma signal and outputs the superposed signal to the S output terminal, an effective system is configured for the switch circuit provided with the S output terminal.

【図面の簡単な説明】[Brief description of drawings]

第1図は本考案の1実施例による映像信号のスイッチ回
路を示す構成図、第2図は第1図に対応する従来例の構
成図である。 BY,BC…バッファ、C…クロマ信号、CSW…クロマ信号選
択スイッチ、CDCSW…制御信号選択スイッチ、R…抵
抗、Sin…S入力端子、SOUT…S出力端子、Y…輝度信
号、YSW…輝度信号選択スイッチ。
FIG. 1 is a block diagram showing a video signal switch circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example corresponding to FIG. BY , B C ... Buffer, C ... Chroma signal, C SW ... Chroma signal selection switch, C DC SW ... Control signal selection switch, R ... Resistance, S in ... S input terminal, S OUT ... S output terminal, Y ... Luminance Signal, Y SW … Luminance signal selection switch.

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】複数の輝度信号・クロマ信号分離入力端子
にそれぞれコンデンサを介して接続され、いずれかの端
子から輝度信号とクロマ信号を選択出力する輝度信号選
択スイッチとクロマ信号選択スイッチを備えた映像信号
のスイッチ回路において、前記複数の輝度信号・クロマ
信号分離入力端子に接続され前記各選択スイッチに連動
してクロマ信号に重畳された直流電圧もしくは低周波信
号電圧を制御信号として選択出力する制御信号選択スイ
ッチを備えたことを特徴とする映像信号のスイッチ回
路。
1. A luminance signal selection switch and a chroma signal selection switch which are respectively connected to a plurality of luminance signal / chroma signal separation input terminals via capacitors and which selectively output a luminance signal and a chroma signal from any one of the terminals. In a video signal switch circuit, control for selectively outputting, as a control signal, a DC voltage or a low-frequency signal voltage that is connected to the plurality of luminance signal / chroma signal separation input terminals and is interlocked with each of the selection switches and superimposed on the chroma signal A video signal switch circuit comprising a signal selection switch.
【請求項2】請求項1記載の映像信号のスイッチ回路に
おいて、前記制御信号選択スイッチによって選択出力さ
れる制御信号をクロマ信号に重畳して輝度信号・クロマ
信号分離出力端子に出力する重畳回路を設けたことを特
徴とする映像信号のスイッチ回路。
2. A video signal switch circuit according to claim 1, further comprising a superimposing circuit for superimposing a control signal selectively output by the control signal selection switch on a chroma signal and outputting the superposed signal to a luminance signal / chroma signal separation output terminal. A video signal switch circuit characterized by being provided.
JP11497890U 1990-11-01 1990-11-01 Video signal switch circuit Expired - Lifetime JPH087750Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11497890U JPH087750Y2 (en) 1990-11-01 1990-11-01 Video signal switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11497890U JPH087750Y2 (en) 1990-11-01 1990-11-01 Video signal switch circuit

Publications (2)

Publication Number Publication Date
JPH0471080U JPH0471080U (en) 1992-06-23
JPH087750Y2 true JPH087750Y2 (en) 1996-03-04

Family

ID=31862703

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11497890U Expired - Lifetime JPH087750Y2 (en) 1990-11-01 1990-11-01 Video signal switch circuit

Country Status (1)

Country Link
JP (1) JPH087750Y2 (en)

Also Published As

Publication number Publication date
JPH0471080U (en) 1992-06-23

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