JPS6358510B2 - - Google Patents
Info
- Publication number
- JPS6358510B2 JPS6358510B2 JP56212828A JP21282881A JPS6358510B2 JP S6358510 B2 JPS6358510 B2 JP S6358510B2 JP 56212828 A JP56212828 A JP 56212828A JP 21282881 A JP21282881 A JP 21282881A JP S6358510 B2 JPS6358510 B2 JP S6358510B2
- Authority
- JP
- Japan
- Prior art keywords
- video
- signal
- frequency
- input terminal
- circuit
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims 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
- 230000002238 attenuated effect Effects 0.000 description 2
- 239000003990 capacitor Substances 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)
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ヨン受
像機に関し、ビデオ入力端子に音声中間周波数
（4.5MHz）のトラツプ回路を挿入することによつ
て、ビデオ入力端子からフラツトな周波数特性の
外部ビデオ信号が入力された場合でも、色副搬送
周波数（3.58MHz）を中心に±500KHzの帯域を
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, and by inserting an audio intermediate frequency (4.5MHz) trap circuit into the video input terminal, a flat signal can be obtained from the video input terminal. Even when an external video signal with frequency characteristics is input, it is possible to secure a band of ±500KHz around the color subcarrier frequency (3.58MHz).
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図はビデオ入力端子付のテレビジヨ
ン受像機の信号処理信号までのブロツク図を示
す。図において、１は内蔵したチユーナ、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、５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ツチ、
７はデイレーライン、８は映像増幅回路、９はバ
ンドパスアンプ、１０は色信号処理回路である。 First, FIG. 1 shows a block diagram of the signal processing signal of a television receiver equipped with a video input terminal. 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, 5 is an external video signal input terminal, 6 is a video signal input switch,
7 is a delay line, 8 is a video amplification circuit, 9 is a bandpass amplifier, and 10 is a color signal processing circuit.
スイツチ６がＡ側にあるときは、アンテナから
の受信信号がチユーナー１、映像中間増幅回路
２、映像検波回路３、映像増幅回路を通つて、ス
イツ６から後段の処理回路に加えられる。スイツ
チ６がＢ側にある時は、ビデオ入力端子５からの
ビデオ信号がスイツチ６を通つて後段の処理回路
に加えられる。 When the switch 6 is on the A side, the received signal from the antenna passes through the tuner 1, video intermediate amplification circuit 2, video detection circuit 3, and video amplification circuit, and is applied from the switch 6 to the subsequent processing circuit. When the switch 6 is on the B side, the video signal from the video input terminal 5 is applied to the subsequent processing circuit through the switch 6.
また、１１はビデオ入力端子５に接続された音
声中間周波数に同調したトラツプ回路である。 Further, 11 is a trap circuit connected to the video input terminal 5 and tuned to the audio intermediate frequency.
従来のトラツプ回路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図
ａ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のように色副搬送周波数（3.58MHz）
を中心に±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に示すようなフラツトな周波
数特性の外部ビデオ信号が入力されてスイツチ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3.58MHzが中心からはずれ
てしまいバランスのくずれた帯域特性となつて色
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 characteristics of the bandpass amplifier 9 are as shown in FIG. Bandpass amplifier 9 for video signals with frequency characteristics
The output of c is the color subcarrier frequency (3.58MHz)
It is designed with characteristics like b to have a band of ±500KHz around . Therefore, an external video signal with a flat frequency characteristic as shown in FIG. 3a is input from the video input terminal 5, and the switch 6
When the signal is applied to the bandpass amplifier 9, the output of the bandpass amplifier 9 with the characteristics shown in b will have its characteristics distorted as shown in c, and 3.58MHz will be shifted from the center, resulting in unbalanced band characteristics and color. This may cause misalignment, etc.
そこで、本受像機では、第１図中に示したよう
に、コンデンサＣ、コイルＬ、抵抗Ｒで4.5MHz
に同調させたトラツプ回路１１を構成してこれを
ビデオ入力端子５に接続することにより、第３図
ａのようなフラツ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のような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3.58MHz±
500KHz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 Figure 1, the capacitor C, coil L, and resistor R provide a 4.5MHz
By configuring a trap circuit 11 tuned to the video input terminal 5 and connecting it to the video input terminal 5, even when an external video signal with a flat frequency characteristic as shown in FIG. As shown in Figure 4 a, the portion above 3MHz can be attenuated, and even if a bandpass amplifier with the same characteristics as shown in b is used, the 3.58MHz± part as shown in c can be attenuated.
It becomes possible to obtain a signal in the 500KHz band with predetermined characteristics.
このように、本発明によれば、内蔵したチユー
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ツトな周
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ヨン受像機において、そ
の外部ビデオ信号の入力端子に音声中間周波数に
同調したトラツプ回路を結合し、このトラツプ回
路を経た外部ビデオ信号ならびに映像検波出力で
あるビデオ信号を、色副搬送波より大なる所定周
波数において最大利得となる周波数特性を有する
バンドパスアンプに供給することで、いずれの
（外部）ビデオ信号であつても、同様な良好な周
波数特性を有する色信号を得ることができ、色ず
れのない良好な画像を得ることができるものであ
る。 As described above, according to the present invention, in addition to the high-frequency limited video signal produced by the built-in tuner and video detection circuit, it is also possible to use an external video signal input from the outside and having a flat frequency characteristic. In such a television receiver, a trap circuit tuned to the audio intermediate frequency is connected to the input terminal of the external video signal, and the external video signal and the video signal which is the video detection output through the trap circuit are converted into color subcarriers. By supplying the signal to a bandpass amplifier that has frequency characteristics that give maximum gain at a larger predetermined frequency, it is possible to obtain a color signal that has similar good frequency characteristics, regardless of the (external) video signal. , it is possible to obtain a good image without color shift.
第１図は本発明の一実施例におけるテレビジヨ
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……チユーナ、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……スイツチ、７……デイレ
ーライン、８……映像増幅回路、９……バンドパ
スアンプ、１０……色信号処理回路。
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... Delay line, 8... Video amplification circuit, 9... Band pass amplifier, 10... Color signal processing circuit.
Claims (1)
ルが所定の傾斜で低下する信号を出力する内蔵の
チユーナおよび映像検波回路と、上記色副搬送波
周波数より高い周波数の信号レベルが低下してい
ない外部からのビデ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
換えて出力するスイツチと、上記スイツチの出力
を入力とし、上記色副搬送波周波数より高い所定
周波数において最大利得となる周波数特性を有
し、色信号を出力するバンドパスアンプとを備え
るとともに、上記ビデオ入力端子に結合され音声
中間周波数に同調し上記外部ビデオ信号の信号レ
ベルを上記所定の傾斜で低下させるトラツプ回路
を備え、このトラツプ回路の出力を上記スイツチ
に外部ビデオ信号として供給することを特徴とす
るテレビジヨン受像機。1. A built-in tuner and video detection circuit that outputs a signal whose signal level at a frequency higher than the color subcarrier frequency decreases at a predetermined slope, and a built-in tuner and video detection circuit that output a signal whose signal level at a frequency higher than the color subcarrier frequency does not decrease. a video input terminal to which a video signal is applied; a switch for switching and outputting the video signal from the video detection circuit and an external video signal from the video input terminal; a bandpass amplifier that has a frequency characteristic that has a maximum gain at a higher predetermined frequency and outputs a color signal, and is coupled to the video input terminal and tuned to the audio intermediate frequency to adjust the signal level of the external video signal to the above. 1. A television receiver comprising a trap circuit that lowers the voltage at a predetermined slope, the output of the trap circuit being supplied to the switch as an external video signal.
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 JPS58115981A (en) | 1983-07-09 |
| JPS6358510B2 true 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) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60130992A (en) * | 1983-12-20 | 1985-07-12 | Matsushita Electric Ind Co Ltd | Television receiver |
| US4963979A (en) * | 1989-04-20 | 1990-10-16 | Rca Licensing Corporation | Television receiver with auxiliary input connector for video signals of a separated Y-C format |
| US4963958A (en) * | 1989-04-20 | 1990-10-16 | Rca Licensing Corporation | Television receiver with auxiliary input connector providing a second luminance signal subjected to enhancing video signals of a separated Y-C format |
| US4935807A (en) * | 1989-04-20 | 1990-06-19 | Rca Licensing Corporation | Television receiver with auxiliary input connector providing a chrominance signal subjected to pre-distortion for video signals of a separated 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58115981A (en) | 1983-07-09 |
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