JPH0465597B2 - - Google Patents

Info

Publication number
JPH0465597B2
JPH0465597B2 JP6388688A JP6388688A JPH0465597B2 JP H0465597 B2 JPH0465597 B2 JP H0465597B2 JP 6388688 A JP6388688 A JP 6388688A JP 6388688 A JP6388688 A JP 6388688A JP H0465597 B2 JPH0465597 B2 JP H0465597B2
Authority
JP
Japan
Prior art keywords
terminal
load
signal line
connector
chroma 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
Application number
JP6388688A
Other languages
Japanese (ja)
Other versions
JPH01236887A (en
Inventor
Yoshio Shimono
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.)
Fujitsu General Ltd
Original Assignee
Fujitsu General 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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP6388688A priority Critical patent/JPH01236887A/en
Publication of JPH01236887A publication Critical patent/JPH01236887A/en
Publication of JPH0465597B2 publication Critical patent/JPH0465597B2/ja
Granted legal-status Critical Current

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  • Processing Of Color Television Signals (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、Y/C分離された輝度信号とクロマ
信号を入力するS端子入力回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an S terminal input circuit that inputs Y/C separated luminance signals and chroma signals.

〔従来の技術〕 従来、外部からY/C分離された輝度信号とク
ロマ信号を入力するために端子を設けたテレビ受
信機がある。更にダビング可能なようにフロント
側、リア側に各々同様な端子を設け両端子を並列
接続したテレビ受信機もある。
[Prior Art] Conventionally, there are television receivers that are provided with terminals for inputting Y/C separated luminance signals and chroma signals from the outside. Furthermore, there is also a television receiver that has similar terminals on the front and rear sides and connects both terminals in parallel to enable dubbing.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

ところが、この端子では、テレビ受信機内に輝
度信号、クロマ信号を取り込む際に負荷抵抗が必
要なることから、手動スイツチにより端子に負荷
抵抗を断続できるように構成していた。
However, since this terminal requires a load resistor when inputting the luminance signal and chroma signal into the television receiver, the terminal was configured so that the load resistor could be switched on and off using a manual switch.

しかし、この方法は端子にコネクタを差込むた
びに手動スイツチを操作する必要があり、その操
作が煩雑であるばかりでなく、その切換操作を忘
れ適正な接続が行われない事態が生じる恐れが多
分にあつた。
However, with this method, it is necessary to operate a manual switch every time a connector is inserted into a terminal, which is not only cumbersome, but also increases the risk of forgetting to switch and not connecting properly. It was hot.

本発明の目的は、コネクタを接続すると負荷抵
抗が正規に自動的に接続されるようにして上記し
たような問題が生じないようにすることである。
An object of the present invention is to prevent the above-mentioned problems from occurring by automatically connecting a load resistor properly when a connector is connected.

〔課題を解決するための手段〕[Means to solve the problem]

このために本発明は、第1S端子と第2S端子の
輝度信号ラインとクロマ信号ラインを各々共通接
続し、輝度信号ラインの各々に負荷抵抗を上記各
端子に連動する各別のスイツチを介して各別に接
続すると共に、クロマ信号ラインの各々に負荷回
路を上記スイツチを各別に制御されるスイツチン
グ素子を介して各別に接続し、 第1S端子にコネクタを差込むことにより該第
1S端子側の輝度信号ラインの負荷抵抗が抜かれ
ると共に上記第2S端子のクロマ信号ラインの負
荷回路が抜かれ、 第2S端子にコネクタを差込むことにより該第
2S端子側の輝度信号ラインの負荷抵抗が抜かれ
ると共に上記第1S端子のクロマ信号ラインの負
荷回路が抜かれるように構成した。
To this end, the present invention connects the luminance signal line and chroma signal line of the first S terminal and the second S terminal in common, and connects a load resistor to each of the luminance signal lines through separate switches linked to the respective terminals. At the same time, the load circuits are connected to each of the chroma signal lines through individually controlled switching elements, and a connector is inserted into the 1S terminal.
The load resistor of the luminance signal line on the 1S terminal side is removed, and the load circuit of the chroma signal line of the 2S terminal is also removed, and by inserting a connector into the 2S terminal,
The load resistor of the luminance signal line on the 2S terminal side is removed, and the load circuit of the chroma signal line of the 1S terminal is removed.

〔実施例〕〔Example〕

以下、本発明の実施例について説明する。第1
図はその一実施例のS端子入力回路を示す図であ
る。1はテレビ受信機のフロント側に設けられる
S端子であり、そこに差し込まれるコネクタ(図
示せず)からの輝度信号Y、クロマ信号Cが各々
内部に抵抗R1,R2、コンデンサC1,C2を
介して取り込まれるようになつている。2はこの
S端子1へコネクタを差し込むことにより切り替
わる連動スイツチであり、抜いた状態では図に示
すように切り替わつている。この状態ではS端子
1の輝度信号Yのラインと接地間に負荷抵抗R3
が接続される。
Examples of the present invention will be described below. 1st
The figure is a diagram showing an S terminal input circuit of one embodiment. 1 is an S terminal provided on the front side of the television receiver, and a brightness signal Y and a chroma signal C from a connector (not shown) inserted therein are internally connected via resistors R1, R2 and capacitors C1, C2, respectively. It is becoming more and more popular. Reference numeral 2 designates an interlocking switch that is switched by inserting a connector into this S terminal 1, and when it is removed, the switch is switched as shown in the figure. In this state, load resistance R3 is connected between the brightness signal Y line of S terminal 1 and the ground.
is connected.

3はテレビ受信機のリア側に設けられるS端子
であり、輝度信号Y、クロマ信号Cのラインが上
記S端子1と並列接続されている。4はこのS端
子1へコネクタを差し込むことにより切り替わる
上記スイツチ3と同様な連動スイツチであり、抜
いた状態では図に示すように切り替わり、輝度信
号Yのラインと接地間に負荷抵抗R4(値は負荷
抵抗R3と同じ)が接続される。
3 is an S terminal provided on the rear side of the television receiver, and lines for a luminance signal Y and a chroma signal C are connected in parallel to the S terminal 1. 4 is an interlocking switch similar to switch 3 mentioned above, which is switched by inserting a connector into this S terminal 1. When it is unplugged, it switches as shown in the figure, and a load resistance R4 (the value is (same as load resistor R3) is connected.

フロント側のS端子1のクロマ信号Cの出力側
にはコンデンサC3と抵抗R5でなる負荷回路5
が、トランジスタQ1を介して接地に対して接続
されている。トランジスタQ1はリア側の連動ス
イツチ4がコネクタ「抜」に切り替わつていると
きは電源を供給されてオン状態にある。
A load circuit 5 consisting of a capacitor C3 and a resistor R5 is connected to the output side of the chroma signal C of the S terminal 1 on the front side.
is connected to ground via transistor Q1. The transistor Q1 is supplied with power and is in an on state when the rear side interlocking switch 4 is switched to the connector "unplugged" state.

リア側のS端子3のクロマ信号Cの出力側にも
コンデンサC4と抵抗R9でなる負荷回路6が、
トランジスタQ2を介して接地に対して接続され
ている。このトランジスタQ2はフロント側の連
動スイツチ2がコネクタ「抜」に切り替わつてい
るときは電源を供給されてオン状態にある。
A load circuit 6 consisting of a capacitor C4 and a resistor R9 is also connected to the output side of the chroma signal C of the S terminal 3 on the rear side.
It is connected to ground via transistor Q2. This transistor Q2 is supplied with power and is in an on state when the front side interlocking switch 2 is switched to the connector "unplugged" state.

以上から、両S端子1,3共にコネクタが接続
されていない時は、連動スイツチ2,4は図の
「抜」状態にあり、輝度信号Yのラインには負荷
抵抗R3,R4が接続され、またトランジスタQ
1,Q2がオンしているのでクロマ信号Cのライ
ンには負荷回路5,6が接続された状態にある。
From the above, when both S terminals 1 and 3 are not connected to the connector, the interlocking switches 2 and 4 are in the "unplugged" state as shown in the figure, and the load resistors R3 and R4 are connected to the brightness signal Y line. Also transistor Q
1 and Q2 are on, the load circuits 5 and 6 are connected to the chroma signal C line.

次に、フロント側のS端子1にコネクタを差し
込むと、連動スイツチ2が「差」側に切り替わ
り、フロント側の負荷抵抗R3がオフすると共
に、トランジスタQ2がオフとなつてリア側の負
荷回路6がオフする。
Next, when the connector is inserted into the S terminal 1 on the front side, the interlocking switch 2 is switched to the "difference" side, the front side load resistor R3 is turned off, and the transistor Q2 is turned off, so that the rear side load circuit 6 is turned off. turns off.

即ち、フロント側のS端子1を使用した場合に
は、輝度信号に対してはリア側の負抵抗R4が機
能し、クロマ信号に対してはフロント側の負荷回
路5が機能するようになる。この結果、高周波成
分を有するクロマ信号に対してはS端子1側の負
荷回路5が接続されるので、リア側の端子3側の
負荷回路6を使用する場合に比べて、クロマ成分
の漏洩(3〜4MHz帯と高い周波数帯域にあるの
で負荷回路への経路が長くなるとその負荷回路へ
の電流成分が分布容量等の影響を受けて接地に漏
洩し易い。)を防止することができる。
That is, when the S terminal 1 on the front side is used, the negative resistance R4 on the rear side functions for the luminance signal, and the load circuit 5 on the front side functions for the chroma signal. As a result, since the load circuit 5 on the S terminal 1 side is connected to the chroma signal having high frequency components, the leakage of chroma components ( Since it is in a high frequency band of 3 to 4 MHz, it is possible to prevent the problem that if the path to the load circuit becomes long, the current component to the load circuit is likely to leak to the ground due to the influence of distributed capacitance, etc.).

リア側のS端子3にコネクタを差し込んだ場合
には上記と逆になり、輝度信号に対してはフロン
ト側の負荷抵抗R3が機能し、クロマ信号に対し
てはリア側の負荷回路6が機能する。
When the connector is inserted into the S terminal 3 on the rear side, the above is reversed, and the load resistor R3 on the front side functions for the luminance signal, and the load circuit 6 on the rear side functions for the chroma signal. do.

次に両方のS端子1,2にコネクタを差し込ん
だ場合、つまり例えばダビングを行うような場合
には、負荷抵抗R3,R4、負荷回路5,6とも
に回路から抜け、コネクタ側のインピーダンスが
負荷インピーダンスとして機能するようになる。
Next, when a connector is inserted into both S terminals 1 and 2, that is, when dubbing is performed, both load resistors R3 and R4 and load circuits 5 and 6 are disconnected from the circuit, and the impedance on the connector side becomes the load impedance. It comes to function as.

〔発明の効果〕〔Effect of the invention〕

以上から本発明によれば、S端子にコネクタを
差し込むことにより自動的に負荷抵抗や負荷回路
が切り替わるようになり、操作が簡素化されると
共に従来のような切替忘れ等もなくなるという利
点かある。
From the above, according to the present invention, the load resistance and load circuit can be automatically switched by inserting a connector into the S terminal, which has the advantage of simplifying the operation and eliminating the problem of forgetting to switch as in the conventional case. .

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例のS端子入力回路の
回路図である。
FIG. 1 is a circuit diagram of an S terminal input circuit according to an embodiment of the present invention.

Claims (1)

【特許請求の範囲】 1 第1S端子と第2S端子の輝度信号ラインとク
ロマ信号ラインを各々共通接続し、輝度信号ライ
ンの各々に負荷抵抗を上記各端子に連動する各別
のスイツチを介して各別に接続すると共に、クロ
マ信号ラインの各々に負荷回路を上記スイツチで
各別に制御されるスイツチング素子を介して各別
に接続し、 第1S端子にコネクタを差込むことにより該第
1S端子側の輝度信号ラインの負荷抵抗が抜かれ
ると共に上記第2S端子のクロマ信号ラインの負
荷回路が抜かれ、 第2S端子にコネクタを差込むことにより該第
2S端子側の輝度信号ラインの負荷抵抗が抜かれ
ると共に上記第1S端子のクロマ信号ラインの負
荷回路が抜かれるように構成したことを特徴とす
るS端子入力回路。 2 上記第1S端子をテレビ受信機のフロント側
に組み込み、上記第2S端子を同テレビ受信機の
リア側に組み込んだことを特徴とする特許請求の
範囲第1項記載のS端子入力回路。
[Claims] 1. The luminance signal line and chroma signal line of the 1st S terminal and the 2nd S terminal are respectively commonly connected, and a load resistor is connected to each of the luminance signal lines via a separate switch linked to each of the terminals. At the same time, a load circuit is separately connected to each of the chroma signal lines via a switching element controlled individually by the above switch, and a connector is inserted into the 1S terminal.
The load resistor of the luminance signal line on the 1S terminal side is removed, and the load circuit of the chroma signal line of the 2S terminal is also removed, and by inserting a connector into the 2S terminal,
An S terminal input circuit characterized in that the load resistor of the luminance signal line on the 2S terminal side is removed, and the load circuit of the chroma signal line of the 1S terminal is removed. 2. The S terminal input circuit according to claim 1, wherein the first S terminal is installed in the front side of a television receiver, and the second S terminal is installed in the rear side of the television receiver.
JP6388688A 1988-03-17 1988-03-17 S terminal input circuit Granted JPH01236887A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6388688A JPH01236887A (en) 1988-03-17 1988-03-17 S terminal input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6388688A JPH01236887A (en) 1988-03-17 1988-03-17 S terminal input circuit

Publications (2)

Publication Number Publication Date
JPH01236887A JPH01236887A (en) 1989-09-21
JPH0465597B2 true JPH0465597B2 (en) 1992-10-20

Family

ID=13242217

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6388688A Granted JPH01236887A (en) 1988-03-17 1988-03-17 S terminal input circuit

Country Status (1)

Country Link
JP (1) JPH01236887A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003085122A (en) 2001-09-13 2003-03-20 Nec Corp Computer system and switch connector

Also Published As

Publication number Publication date
JPH01236887A (en) 1989-09-21

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