JPS60244177A - Color television receiver - Google Patents

Color television receiver

Info

Publication number
JPS60244177A
JPS60244177A JP59100911A JP10091184A JPS60244177A JP S60244177 A JPS60244177 A JP S60244177A JP 59100911 A JP59100911 A JP 59100911A JP 10091184 A JP10091184 A JP 10091184A JP S60244177 A JPS60244177 A JP S60244177A
Authority
JP
Japan
Prior art keywords
resistance
signal
switch
collector
video
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
Application number
JP59100911A
Other languages
Japanese (ja)
Inventor
Koji Yoshinaga
吉永　光司
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59100911A priority Critical patent/JPS60244177A/en
Publication of JPS60244177A publication Critical patent/JPS60244177A/en
Pending legal-status Critical Current

Links

Landscapes

  • Color Television Systems (AREA)
  • Processing Of Color Television Signals (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

PURPOSE:To switch the frequency characteristics for each signal and to project excellent pictures by changing the collector resistance of an output transistor of a video output circuit between reception modes of RGB and composite video signals. CONSTITUTION:An amplifying transistor TR7 is provided to a video output circuit of a TV receiver, and an input signal D is supplied to a drive circuit from the TR7. The emitter of the TR7 is grounded via a resistance 8, and the collector of the TR7 is connected to a power supply B via a resistance 4. Furthermore a resistance 6 is connected to said collector, and the power supply B is connected to the resistance 6 via a switch 5. Then the collector resistance of the TR7 is changed by the switch 5 between reception modes of RGB and composite video signals respectively. Therefore the frequency characteristics are set properly for each signal, and excellent pictures are displayed on a screen.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、カラーテレビジョン受像機の特にビデオ出力
回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates in particular to video output circuits of color television receivers.

従来例の構成とその問題点 従来の、ＲＧＢビデオ信号（原色信号）とコンポジット
ビデオ信号との両方が入力できるカラーテレビジョン受
像機においては、ＲＧＢビデオ信号とコンポジットビデ
オ信号のいずれの受信時のにおいてもビデオ出力回路は
同じものを使用しており、ＲＧＢビデオ信号の受信時と
コンポジットビデオ信号の受信時のそれぞれに適応させ
るだめのブライトと・コントラストの切換えは、映像処
理回路で行なうようにしている。この場合、映像処理回
路は複雑なものになり、コストが高くなってしまうとい
う問題がある。Conventional configuration and its problems In a conventional color television receiver that can input both RGB video signals (primary color signals) and composite video signals, when receiving either the RGB video signal or the composite video signal, Both use the same video output circuit, and the video processing circuit is used to switch between brightness and contrast, which are adapted to when receiving RGB video signals and when receiving composite video signals. . In this case, there is a problem that the video processing circuit becomes complicated and the cost increases.

一方、従来より、コンポジットビデオ信号に比べて帯域
の広いＲＧＢビデオ信号を受信するときにビデオ出力ト
ランジスタの周波数特性を広くするように切換えるべく
、第１図に示すように、ビデオ出力トランジスタ１のエ
ミッタ抵抗２に並列ｌ（コンデンサ３を挿入することが
提案されているが、この場合には、出力段でのコントラ
ストおよびプライトの補正ができないという欠点がある
。On the other hand, as shown in FIG. It has been proposed to insert a capacitor 3 in parallel with the resistor 2, but this has the disadvantage that it is not possible to correct contrast and brightness at the output stage.

発明の目的 本発明は、上記欠点に鑑み、簡単な構成でＲＧＢビデオ
信号とコンポジットビデオ信号のいずれの場合において
も画質の優れた映像を得ることのできる映像出力回路を
備えだカラーテレビジョン受像機を提供することを目的
とする。Purpose of the Invention In view of the above-mentioned drawbacks, the present invention provides a color television receiver equipped with a video output circuit that is simple in configuration and capable of producing images of excellent quality in both RGB video signals and composite video signals. The purpose is to provide

発明の構成 本発明においては、ビデオ出力トランジスタのコレクタ
抵抗を、コンポジットビデオ信号の受信時とＲＧＢビデ
オ信号の受信時とで切換えてそれぞれの信号に応じた利
得と周波数特性を得るようにしたものであり、おのおの
の信号に適した画像を得ることができる。Structure of the Invention In the present invention, the collector resistance of the video output transistor is switched between when receiving a composite video signal and when receiving an RGB video signal to obtain gain and frequency characteristics corresponding to each signal. Yes, images suitable for each signal can be obtained.

実施例の説明 以下、本発明の一実施例について図面を参照して説明す
る。第２図において、７はビデオ出力トランジスタであ
り、そのエミッタは抵抗８を介して接地されて層る。又
、そのコレクタは抵抗４を介してＢ電源に接続されると
ともに抵抗６及びスイッチ５を介してＢ電源に接続され
ている。入力信号りは増幅用トランジスタ７０ペースに
入力され、出力信号Ｅはコレクタより増幅され出力され
る。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, 7 is a video output transistor, the emitter of which is grounded via a resistor 8. Further, its collector is connected to the B power source via a resistor 4 and also to the B power source via a resistor 6 and a switch 5. The input signal E is input to the amplification transistor 70, and the output signal E is amplified and outputted from the collector.

次に、この回路の動作を説明する。コンポジットビデオ
信号を受信する場合は、スイッチ５を開放させる。一方
、ＲＧＢビデオ信号を受信する場合は、スイッチ５を閉
成し、増幅用トランジスタ７のコレクタ負荷抵抗を小さ
くする。このとき、出力トランジスタ７の利得は小さく
なり、映像出力画面はビームスポットの小さいすっき如
しだものとなる。また、同時に周波数帯域も広がり、解
像度の高い画面が得られる。Next, the operation of this circuit will be explained. When receiving a composite video signal, switch 5 is opened. On the other hand, when receiving an RGB video signal, the switch 5 is closed and the collector load resistance of the amplification transistor 7 is reduced. At this time, the gain of the output transistor 7 becomes small, and the video output screen becomes a clear image with a small beam spot. At the same time, the frequency band is also expanded and a screen with high resolution can be obtained.

コンポジットビデオ信号を受信する時にスイッチ５を開
放すると、出力されるビデオ信号の振幅は大きくなり文
字を視認するのに見やすい明るくコントラストの高い画
質が得られる。このときビデオ帯域は狭くなるがコンポ
ジットビデオ信−号の場合はもともと帯域が限られてい
るため、この帯域さえカバーできればよい。この時の消
費電力は小さくなる。When the switch 5 is opened when receiving a composite video signal, the amplitude of the output video signal is increased, and a bright, high-contrast image quality that is easy to see characters is obtained. At this time, the video band becomes narrower, but since the band is originally limited in the case of a composite video signal, it is only necessary to cover this band. Power consumption at this time becomes smaller.

スイッチ５は、機構スイッチでも、半導体スイッチを用
いてもよい。さらに、スイッチ６は１画面に映出する信
号（ＲＧＢビデオ信号かコンポジットビデオ信号か）の
選択操作に連動して切換えるようにする。The switch 5 may be a mechanical switch or a semiconductor switch. Further, the switch 6 is switched in conjunction with the selection operation of the signal (RGB video signal or composite video signal) to be displayed on one screen.

なお、図示している例ではビデオ出力トランジスタを１
色分のみ示しているが、他の２色分のビデオ出力トラン
ジスタについても同様である。Note that in the illustrated example, the video output transistor is
Although only the colors are shown, the same applies to the video output transistors for the other two colors.

発明の効果 以上の様に、本発明によれば、映像出力回路におけるビ
デオ出力トランジスタのコレクタ抵抗をＲＧＢビデオ信
号受信時とコンポジットビデオ信号受像信時によって切
換えるようにしたこと如より、画像の明るさ、周波数特
性をおのおのに適した特性に切換えることができ、しか
も、出力段でのプライトやコントラストの調整にも影響
を４えることがない優れたカラーテレビジョン受像機を
得ることができるものである。Effects of the Invention As described above, according to the present invention, since the collector resistance of the video output transistor in the video output circuit is switched depending on whether an RGB video signal is received or a composite video signal is received, the brightness of the image can be improved. , it is possible to obtain an excellent color television receiver in which the frequency characteristics can be switched to characteristics suitable for each, and furthermore, the adjustment of the light and contrast at the output stage is not affected. .

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

第１図は従来例のカラーテレビジョン受像機の基本的な
ビデオ出力回路の結線図、第２図は本発明の一実施例に
おけるカラーテレビジョン受像機のビデオ出力回路の結
線図である。 １・・・・・・抵抗、２・・・・・・抵抗、３．・・・
・・・増幅用トランジスタ、４・・・・・・抵抗、５・
・・・・−スイッチ、６・・・・・・抵抗、７・・・・
・増幅用トランジスタ、８・・・・・・抵抗、Ａ・・・
・・・入力信号、Ｃ・・・・・出力信号、Ｄ・・・・・
入力信号、Ｅ・・・・・出力信号。FIG. 1 is a wiring diagram of a basic video output circuit of a conventional color television receiver, and FIG. 2 is a wiring diagram of a video output circuit of a color television receiver according to an embodiment of the present invention. 1...Resistance, 2...Resistance, 3. ...
...Amplification transistor, 4...Resistor, 5.
...-Switch, 6...Resistor, 7...
・Amplification transistor, 8... Resistor, A...
...Input signal, C...Output signal, D...
Input signal, E...Output signal.

Claims (1)

【特許請求の範囲】[Claims] ビデオ信号を出力するビデオ出力トランジスタのコレク
タ抵抗ヲ、コンポジットビデオ信号を受信するときとＲ
ＧＢビデオ信号を受信するときとで切換える切換回路を
具備したカラーテレビジョン受像機。The collector resistance of the video output transistor that outputs a video signal is
A color television receiver equipped with a switching circuit that switches when receiving a GB video signal.
JP59100911A 1984-05-18 1984-05-18 Color television receiver Pending JPS60244177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59100911A JPS60244177A (en) 1984-05-18 1984-05-18 Color television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59100911A JPS60244177A (en) 1984-05-18 1984-05-18 Color television receiver

Publications (1)

Publication Number Publication Date
JPS60244177A true JPS60244177A (en) 1985-12-04

Family

ID=14286520

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59100911A Pending JPS60244177A (en) 1984-05-18 1984-05-18 Color television receiver

Country Status (1)

Country Link
JP (1) JPS60244177A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6423176U (en) * 1987-07-30 1989-02-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6423176U (en) * 1987-07-30 1989-02-07

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