JPS58115981A - Television receiver - Google Patents
Television receiverInfo
- Publication number
- JPS58115981A JPS58115981A JP21282881A JP21282881A JPS58115981A JP S58115981 A JPS58115981 A JP S58115981A JP 21282881 A JP21282881 A JP 21282881A JP 21282881 A JP21282881 A JP 21282881A JP S58115981 A JPS58115981 A JP S58115981A
- Authority
- JP
- Japan
- Prior art keywords
- video
- input terminal
- circuit
- signal
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 230000002238 attenuated effect Effects 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ビデオ入力端子付のテレビジョン受像機に関
し、ビデオ入力端子に音声中間周波数（４，５ＭＨｚ
）のトラップ回路を挿入することによって、ビデオ入力
端子からフラットな周波数特性の外部ビデオ信号が入力
された場合でも、色副搬送周波数（ｓ、６８ＭＨｚ）を
中心に±５００ＫＨ２（７）帯域を確保できるものを提
供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television receiver equipped with a video input terminal.
) By inserting a trap circuit, it is possible to secure a ±500KH2 (7) band around the color subcarrier frequency (s, 68MHz) even when an external video signal with flat frequency characteristics is input from the video input terminal. It is something that provides something.
以下、本発明につき、その一実施例を示す図面を参照し
て詳細に説明する。EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment thereof.
まず、第１図にビデオ入力端子付のテレビジョン受像機
の信号処理回路までのブロック図を示す。First, FIG. 1 shows a block diagram up to the signal processing circuit of a television receiver equipped with a video input terminal.
図において、１は内蔵したチューナ、２は映像中間周波
増幅回路、３は映像検波回路、４は映像増幅回路である
。また、６は外部ビデオ信号の入力端子、６はビデオ信
号の入力切換スイッチ、７はディレーライン、８は映像
増幅回路、９はバンドパスアンプ、１ｏは色信号処理回
路である。In the figure, 1 is a built-in tuner, 2 is a video intermediate frequency amplification circuit, 3 is a video detection circuit, and 4 is a video amplification circuit. Further, 6 is an input terminal for an external video signal, 6 is an input switch for a video signal, 7 is a delay line, 8 is a video amplification circuit, 9 is a bandpass amplifier, and 1o is a color signal processing circuit.
スイッチ６がＡ側にあるときは、アンテナからの受信信
号がチューナー１、映像中間増幅回路２゜映像検波回路
３．映像増幅回路を通って、スイノ６から後段の処理回
路に加えられる。スイッチ６がＢ側にある時は、ビデオ
入力端子５からのビデオ信号がスイッチ６を通って後段
の処理回路に加えられる。When the switch 6 is on the A side, the received signal from the antenna is sent to the tuner 1, the video intermediate amplifier circuit 2, the video detection circuit 3. It passes through the video amplification circuit and is applied to the processing circuit at the subsequent stage from the SUINO 6. When the switch 6 is on the B side, the video signal from the video input terminal 5 passes through the switch 6 and is applied to the subsequent processing circuit.
また、１ｏはビデオ入力端子１１に接続した音声中間周
波数に同調したトランプ回路である。Further, 1o is a playing card circuit connected to the video input terminal 11 and tuned to the audio intermediate frequency.
従来のトラップ回路１１のないものの場合には、バンド
パスアンプ９の周波数特性は、第２国都に示すような内
蔵の映像検波回路３、映像増幅回路４からの３ＭＨｚ以
上の部分が減衰された周波数特性のビデオ信号に対して
バンドパスアンプ９の出力がＣのように色副搬送成波数
（３，５８ＭＨ２）を中心に一５００ＫＨｚの帯域をも
つようにｂのような特性に設計されている。このため、
ビデオ入力端子５から第３図ａに示すようなフラットな
周波数特性の外部ビデオ信号が入力されてスイッチ６か
らバンドパスアンプ９に加えられた場合、ｂのような特
性のバンドパスアンプ９出力ではＣのようにその特性が
歪んで３．５８ＭＨ２が中心からはずれてしまいバラン
スのくずれだ帯域特性となって色ずれの発生等の原因と
なる。In the case of a conventional device without a trap circuit 11, the frequency characteristic of the bandpass amplifier 9 is a frequency in which the portion of 3 MHz or more from the built-in video detection circuit 3 and video amplification circuit 4 is attenuated, as shown in the second national capital. The output of the bandpass amplifier 9 is designed to have a characteristic as shown in b so that the output of the bandpass amplifier 9 has a band of 1,500 KHz centered around the color subcarrier wave number (3.58 MH2) as shown in C for a video signal with a characteristic. For this reason,
When an external video signal with a flat frequency characteristic as shown in FIG. As shown in C, the characteristics are distorted and 3.58MH2 is deviated from the center, resulting in unbalanced band characteristics and causing color shift.
そこで、本受像機では、第１図中に示したように、コン
テンサＣ，コイルＬ、抵抗Ｒで４．５ Ｍ Ｈｚに同調
させたトラップ回路１１を構成してこれをビデオ入力端
子６に接続することにより、第３図ａのよう々フラット
な周波数特性の外部ビデオ信号がビデオ入力端子５から
入力された場合でも第４図ａのようにその３ＭＨｚ以上
の部分を減衰させることができ、ｂのよう々同一の特性
のバンドパスアンプを用いた場合でもＣのような３．５
８ＭＨｚ±５００ＫＨ２の帯域の信号を所定の特性で得
ることが可能となる。Therefore, in this receiver, as shown in FIG. 1, a trap circuit 11 tuned to 4.5 MHz is configured using a capacitor C, a coil L, and a resistor R, and this is connected to the video input terminal 6. By doing this, even when an external video signal with a flat frequency characteristic as shown in Fig. 3a is input from the video input terminal 5, the portion above 3 MHz can be attenuated as shown in Fig. 4a, and b Even when using a bandpass amplifier with the same characteristics as 3.5
It becomes possible to obtain a signal in a band of 8 MHz±500 KH2 with predetermined characteristics.
このように、本発明によれば、内蔵したチューナーと映
像検波回路による高域の制限されたビデオ信号の他に、
外部から入力されるフラットな周波数特性の外部ビデオ
信号をも使用することができるようにしたテレビジョン
受像機において、その外部ビデオ信号の入力端子に音声
中間周波数に同調したトラップ回路を接続したことによ
り、同じ信号処理回路を用いて内部ビデオ信号の場合と
同様々良好な特性で信号処理をすることができるもので
ある。As described above, according to the present invention, in addition to the video signal whose high frequency is limited by the built-in tuner and video detection circuit,
This is achieved by connecting a trap circuit tuned to the audio intermediate frequency to the input terminal of the external video signal in a television receiver that can also use an external video signal input from the outside with a flat frequency characteristic. , the same signal processing circuit can be used to process the signal with the same good characteristics as in the case of internal video signals.
第１図は本発明の一実施例におけるテレビジョン受像機
の回路図、第２図、第３図、第４図はその動作特性を示
す特性図である。
１・・・・・・チューナ、２・・・・・・映像中間周波
増幅回路、３・・・・・・映像検波回路、４・・・・・
・映像増幅回路、５・・・・・・入力端子、６・・・・
・・スイッチ、７・・・・・・ティレーライン、８・・
・・・・映像増幅回路、９・・団・バンドパスアンプ、
１０・・・・・・色信号処理回路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第９
図 第３図
第 ４ 図
−４８５＝FIG. 1 is a circuit diagram of a television receiver according to an embodiment of the present invention, and FIGS. 2, 3, and 4 are characteristic diagrams showing its operating characteristics. 1...Tuner, 2...Video intermediate frequency amplification circuit, 3...Video detection circuit, 4......
・Video amplification circuit, 5... Input terminal, 6...
...Switch, 7...Tiley line, 8...
...Video amplification circuit, 9...Gun band pass amplifier,
10... Color signal processing circuit. Name of agent: Patent attorney Toshio Nakao and one other person No. 9
Figure 3 Figure 4 Figure -485=
Claims (1)
オ信号が加えられるビデオ入力端子と、上記映像検波回
路からのビデオ信号と上記ビデオ入力端子からの外部ビ
デオ信号とを切換えるスイッチと、この切換えられたビ
デオ信号を処理する処理回路とを備えるとともに、上記
ビデオ入力端子に音声中間周波数に同調したトラップ回
路を接続したことを特徴とするテレビジョン受像機。A built-in tuner and video detection circuit, a video input terminal to which a video signal is applied from the outside, a switch for switching between the video signal from the video detection circuit and an external video signal from the video input terminal, and the switched video 1. A television receiver comprising: a processing circuit for processing a signal; and a trap circuit tuned to an audio intermediate frequency is connected to the video input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21282881A JPS58115981A (en) | 1981-12-29 | 1981-12-29 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21282881A JPS58115981A (en) | 1981-12-29 | 1981-12-29 | Television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58115981A true JPS58115981A (en) | 1983-07-09 |
| JPS6358510B2 JPS6358510B2 (en) | 1988-11-16 |
Family
ID=16629030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21282881A Granted JPS58115981A (en) | 1981-12-29 | 1981-12-29 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58115981A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60130992A (en) * | 1983-12-20 | 1985-07-12 | Matsushita Electric Ind Co Ltd | Television receiver |
| TR25530A (en) * | 1989-04-20 | 1993-05-01 | Thomson Consumer Electronics | TELEVISION RECEIVER WITH AUXILIARY INPUT CONNECTOR FOR VIDEO SIGNALS WITH A SEPARATE Y-C FORMAT |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5435456A (en) * | 1977-08-24 | 1979-03-15 | Kubota Ltd | Support for insulated double pipe |
-
1981
- 1981-12-29 JP JP21282881A patent/JPS58115981A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5435456A (en) * | 1977-08-24 | 1979-03-15 | Kubota Ltd | Support for insulated double pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60130992A (en) * | 1983-12-20 | 1985-07-12 | Matsushita Electric Ind Co Ltd | Television receiver |
| TR25530A (en) * | 1989-04-20 | 1993-05-01 | Thomson Consumer Electronics | TELEVISION RECEIVER WITH AUXILIARY INPUT CONNECTOR FOR VIDEO SIGNALS WITH A SEPARATE Y-C FORMAT |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6358510B2 (en) | 1988-11-16 |
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