JPH02312465A - Television receiver - Google Patents
Television receiverInfo
- Publication number
- JPH02312465A JPH02312465A JP1135006A JP13500689A JPH02312465A JP H02312465 A JPH02312465 A JP H02312465A JP 1135006 A JP1135006 A JP 1135006A JP 13500689 A JP13500689 A JP 13500689A JP H02312465 A JPH02312465 A JP H02312465A
- Authority
- JP
- Japan
- Prior art keywords
- video output
- signal
- circuit
- band
- standard television
- 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
- 230000005855 radiation Effects 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 230000006866 deterioration Effects 0.000 description 5
- 230000020169 heat generation Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Television Systems (AREA)
- Picture Signal Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、現行標準テレビジョン方式と高品位テレビ
ジョン方式との双方の放送が受像可能とされたテレビジ
ョン受像機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver capable of receiving broadcasts of both the current standard television system and high-definition television system.
この発明は、標準テレビジョン放送と高品位テレビジョ
ン放送とを受像可能なテレビジョン受像機において、受
信放送の方式に応じて映像出力回路の周波数特性を切り
換えるようにすることにより、標準テレビジョン放送を
受信する際における映像出力回路からの高調波の不要輻
射を低減すると共に映像出力回路に使用されているトラ
ンジスタの発熱を軽減し、しかも画質の劣化を防止する
ようにしたものである。The present invention provides a television receiver capable of receiving standard television broadcasting and high-definition television broadcasting, by switching the frequency characteristics of a video output circuit according to the received broadcasting system. The present invention is designed to reduce unnecessary harmonic radiation from the video output circuit when receiving images, reduce heat generation of transistors used in the video output circuit, and prevent deterioration of image quality.
近年、高度情報社会の進展に伴い高度な通信ンステムが
開発されており、特に衛星通信システムにおいてはテレ
ビジョン放送の高度化が推し進められており、映画なみ
の臨場感や迫力が得られ、高解像度の映像を再現できる
高品位テレビジョン（ＩＩＤＴＶ）放送はその１つであ
る。高品位テレビジョンではアスペクト比が１６：９と
され、水平走査数が１１２５本とされ、映像信号帯域が
２０ＭＨｚ とされている。これに対して、現行のＮＴ
ＳＣ方式では、アスペクト比が４：３とされ、水平走査
線が５２５本とされ、映像信号帯域が４．２ＭＨｚとさ
れている。In recent years, advanced communication systems have been developed with the development of an advanced information society, and television broadcasting, especially in satellite communication systems, is becoming more sophisticated. One example of this is high-definition television (IIDTV) broadcasting, which can reproduce video images. In high-definition television, the aspect ratio is 16:9, the number of horizontal scans is 1125, and the video signal band is 20 MHz. In contrast, the current N.T.
In the SC system, the aspect ratio is 4:3, the number of horizontal scanning lines is 525, and the video signal band is 4.2 MHz.
このような高品位テレビジョン放送の開始に備えて、現
行の標準テレビジョン放送と高品位テレビジョン放送の
双方が受像可能なテレビジョン受像機の開発が進められ
ている（特開昭５８−８１３８６号公報）。In preparation for the start of such high-definition television broadcasting, development of a television receiver that can receive both the current standard television broadcasting and high-definition television broadcasting is underway (Japanese Patent Laid-Open No. 58-81386). Publication No.).
ところが、このような現行の標準テレビジョン放送と高
品位テレビジョン放送の双方が受像可能なテレビジョン
受像機では、映像出力段は現行の標準テレビジョン放送
を受像する場合でも、高品位テレビジョン放送を受像す
る場合でも共通に使用される。つまり、映像出力段の周
波数特性は映像信号帯域の広い高品位テレビジョン放送
を受像できるようにしておれば、当然標準テレビジョン
放送は受像できるので、大体映像出力段の周波数特性を
２０ＭＨｚに設定している。However, in such television receivers that can receive both standard television broadcasting and high-definition television broadcasting, the video output stage is capable of receiving both standard television broadcasting and high-definition television broadcasting. It is also commonly used when receiving images. In other words, if the frequency characteristics of the video output stage are set so that it can receive high-quality television broadcasts with a wide video signal band, then standard television broadcasts can of course be received, so the frequency characteristics of the video output stage should be set to 20MHz. ing.
ところが、このように映像出力段の周波数特性を２０Ｍ
Ｈｚに設定していると、標準テレビジョン放送を受像し
た場合にその高調波までも増幅することになり、従って
映像出力段からの高調波の不要輻射が増大する欠点があ
った。However, as shown above, the frequency characteristics of the video output stage are 20M
If it is set to Hz, even the harmonics of standard television broadcasting will be amplified when the standard television broadcast is received, which has the drawback of increasing unnecessary radiation of harmonics from the video output stage.
また、一般的に広帯域になる程負荷電流が増加して映像
出力段に使用されているトランジスタの発熱が問題とな
り、放送時間の短い高品位テレビジョン放送の受像の場
合は特に問題ならないが、放送時間の長い標準テレビジ
ョン放送の受像の場合は問題であった。Additionally, in general, the wider the band, the higher the load current, which causes heat generation in the transistors used in the video output stage, which is not a particular problem when receiving high-definition television broadcasts with short broadcast times. This was a problem when receiving long standard television broadcasts.
また、一般的に高域が上がると画像にリンギングが生じ
るが、特に標準テレビジョン放送の受像の場合高調波ま
で増幅されるのでリンギングの発生する度合いが大きく
、画質が劣化する等の欠点があった。In addition, ringing generally occurs in the image when the high frequency range increases, but especially in the case of standard television broadcast reception, harmonics are amplified, so the degree of ringing is large, and there are drawbacks such as deterioration of image quality. Ta.
この発明は斯る点に鑑みてなされたもので、上述の欠点
を一掃することができるテレビジョン受像機を提供する
ものである。The present invention has been made in view of the above, and an object thereof is to provide a television receiver that can eliminate the above-mentioned drawbacks.
この発明によるテレビジョン受像機は、標準テレビジョ
ン放送と高品位テレビジョン放送とを受像可能なテレビ
ジョン受像機において、受信放送の方式に応じて映像出
力回路（２，５） の周波数特性を切り換えるように
構成している。The television receiver according to the present invention is capable of receiving standard television broadcasting and high-definition television broadcasting, and switches the frequency characteristics of the video output circuit (2, 5) according to the received broadcasting method. It is configured as follows.
高品位テレビジョン放送の受像時には映像出力回路（２
，５） の周波数特性を約２７１４ Ｈｚ近傍まで延
ばし、標準テレビジョン放送の受像時にはその約１７２
位の周波数特性とする。これにより標準テレビジョン放
送受像時の周波数特性が適切な周波数特性まで抑えられ
るので、高調波の不要輻射が低減されると共に映像出力
回路に使用されているトランジスタの発熱が軽減され、
しかも画質の劣化も防止される。When receiving high-definition television broadcasts, the video output circuit (2
, 5) has been extended to around 2714 Hz, and when receiving standard television broadcasts, the frequency response is approximately 172 Hz.
The frequency characteristics are as follows. As a result, the frequency characteristics when receiving standard television broadcasts can be suppressed to an appropriate frequency characteristic, reducing unnecessary radiation of harmonics and the heat generated by the transistors used in the video output circuit.
Moreover, deterioration of image quality is also prevented.
以下、この発明の一実施例を第１図及び第２図に基づい
て詳しく説明する。Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 and 2.
第１図は本実施例の回路構成を示すもので、同図におい
て、（１）は入力端子であって、この入力端子（１）に
は高品位テレビジョン放送受像時には高品位テレビジョ
ン信号が供給され、標準テレビジョン放送受像時には標
準テレビジョン信号が供給される。（２）はドライバで
あって、輪郭強調用のシャープネスＶ Ｒ（３）を有し
、Ｖ Ｒ（３）をあげるとシャープネスのゲインが上が
って帯域が広がり、Ｖ Ｒ（３）を絞るとシャープネス
のゲインが下がって帯域が狭くなる。Ｖ Ｒ（３）の中
点Ｐとアース間にスイッチ回路（４）が設けられ、この
スイッチ回Ｉ！８（４）は後述の如く高品位テレビジョ
ン放送受像時には開放（オフ）され、標準テレビジョン
放送受像時には閉成（オン）される。Figure 1 shows the circuit configuration of this embodiment. In the figure, (1) is an input terminal, and a high-definition television signal is input to this input terminal (1) when receiving a high-definition television broadcast. When receiving a standard television broadcast, a standard television signal is supplied. (2) is a driver that has a sharpness VR(3) for edge enhancement.Increasing VR(3) increases the sharpness gain and widens the band, and reducing VR(3) increases the sharpness. The gain decreases and the band becomes narrower. A switch circuit (4) is provided between the midpoint P of VR (3) and ground, and this switch circuit I! 8(4) is opened (off) when receiving a high-definition television broadcast, and closed (on) when receiving a standard television broadcast, as will be described later.
（５）はドライバ（２）と共に映像出力回路を構成する
増幅器であって、周波数特性をあげて解像度を良くする
ために抵抗器（６）及びコンデンサ（７）から成るエミ
ッタピーキング回路（８）を有する。このエミッタピー
キング回路（８）とアース間にスイッチ回路（９）が設
けられ、このスイッチ回路（９）は後述の如く高品位テ
レビジョン放送受像時には閉成され、標準テレビジョン
放送受像時には開放される。つまり、高品位テレビジョ
ン放送受像時にはエミッタピーキング回路（８）を挿入
して帯域を広げ解像度を上げるようにしている。(5) is an amplifier that constitutes a video output circuit together with the driver (2), and an emitter peaking circuit (8) consisting of a resistor (6) and a capacitor (7) is used to improve frequency characteristics and improve resolution. have A switch circuit (9) is provided between this emitter peaking circuit (8) and the ground, and as described later, this switch circuit (9) is closed when receiving a high-definition television broadcast, and is opened when receiving a standard television broadcast. . That is, when receiving high-definition television broadcasts, an emitter peaking circuit (8) is inserted to widen the band and increase resolution.
（１０）は増幅器（５〕の出力が供給される受像管、（
１１）はモード切換信号が供給される制御端子であって
、この制ＶＢ＠子（１１）には標準テレビジョン放送受
像時には第ルベル例えばハイレベルのモード切換信号が
供給され、高品位テレビジョン放送受像時には第２レベ
ル例えばローレベルのモード切換信号が供給される。(10) is a picture tube to which the output of the amplifier (5) is supplied, (
Reference numeral 11) is a control terminal to which a mode switching signal is supplied, and this control terminal VB@(11) is supplied with a high level mode switching signal, for example, when receiving standard television broadcasting, and when receiving high-quality television broadcasting. At the time of image reception, a second level, for example, a low level mode switching signal is supplied.
この制御端子（１１）からのモード切換信号はスイッチ
回路（４）及び（９）に供給され、モード切換信号がハ
イレベルのときすなわち標準テレビジョン放送受像時に
はスイッチ回路（４）は閉成され、スイッチ回路（９）
は開放される。逆にモード切換信号がローレベルのとき
すなわち高品位テレビジョン放送受像時にはスイッチ回
路（４）は開放され、スイッチ回路（９）は閉成される
。The mode switching signal from the control terminal (11) is supplied to switch circuits (4) and (9), and when the mode switching signal is at a high level, that is, when standard television broadcasting is being received, the switching circuit (4) is closed. Switch circuit (9)
will be released. Conversely, when the mode switching signal is at a low level, that is, when high-quality television broadcasting is being received, the switch circuit (4) is opened and the switch circuit (9) is closed.
次に第１図の回路動作を第２図を参照して説明する。Next, the operation of the circuit shown in FIG. 1 will be explained with reference to FIG. 2.
いま、入力端子（１）に高品位テレビジョン信号が得ら
れると、制御端子（１１）にはローレベルのモード切換
信号が得られる。このローレベルのモード切換信号によ
りスイッチ回路（４）が開放してＶ Ｒ（３）の中点Ｐ
の電位が上がり、つまりＶ Ｒ（３）を上げたと等価と
なってンヤープネスのゲインが上がり帯域が広がる。ま
た、ローレベルのモード切換信号によりスイッチ回路（
９）が閉成してエミッタピーキング回路（８）が挿入さ
れて帯域が広がる。この結果、ドライバ（２）を通り、
増幅器（５）の出力側に得られたビデオ出力信号は第２
図に破線ａで示すような広帯域の信号として取り出され
、受像管（１０）に供給される。Now, when a high-quality television signal is obtained at the input terminal (1), a low-level mode switching signal is obtained at the control terminal (11). This low-level mode switching signal opens the switch circuit (4), and the midpoint P of VR (3)
The potential of V R (3) increases, which is equivalent to increasing V R (3), and the gain of the amplitude increases and the band widens. In addition, the switch circuit (
9) is closed and an emitter peaking circuit (8) is inserted to widen the band. As a result, through the driver (2),
The video output signal obtained at the output side of the amplifier (5) is
The signal is extracted as a broadband signal as shown by the broken line a in the figure, and is supplied to the picture tube (10).
一方、入力端子（１月ご標準テレビジョン信号が得られ
ると、制御端子（１１）にはハイレベルのモード切換信
号が得られる。このハイレベルモード切換信号によりス
イッチ回路（４）が閉成してＶ Ｒ（３）の中点Ｐの電
位が下がり、つまりＶ Ｒ（３）を絞ったと等価よなっ
てシャープネスのゲインが下がり帯域が狭くなる。また
、ハイレベルのモード切換信号によりスイッチ回路（９
）が開放してエミッタピーキング回路（８）が取り除か
れて帯域が狭くなる。この結果ドライバ（２）を通り、
増幅器（５）の出力側に得られたビデオ出力信号は第２
図に実線すで示すような高品位テレビジョン放送受像時
より約１／２の狭帯域の信号として取り出され、受像管
（１０）に供給される。なお、第２図において、実線す
の特性を通常の標準テレビジョン信号の映像帯域（４，
２ＭＨｚ）より延ばしているのは高画質のＶＴＲへの録
画を考慮しているためである。On the other hand, when a standard television signal is obtained at the input terminal (January), a high-level mode switching signal is obtained at the control terminal (11).This high-level mode switching signal closes the switch circuit (4). , the potential at the midpoint P of VR(3) decreases, which is equivalent to narrowing down VR(3), and the sharpness gain decreases, narrowing the band.In addition, the high-level mode switching signal causes the switch circuit ( 9
) is opened, the emitter peaking circuit (8) is removed, and the band becomes narrower. As a result, it passes through driver (2),
The video output signal obtained at the output side of the amplifier (5) is
As already shown by the solid line in the figure, the signal is extracted as a narrowband signal that is about 1/2 that of when receiving a high-definition television broadcast, and is supplied to the picture tube (10). In Fig. 2, the characteristics of the solid line are expressed by the video band (4, 4,
The reason why it is longer than 2MHz is to take into account recording on a high-quality VTR.
このように本実施例では、標準テレビジョン放送の受像
時にはドライバ（２）及び増幅器（５）の帯域を狭くす
るようにしているので、高調波の不要輻射が低減され、
使用しているトランジスタの発熱の問題がなくなり、画
質が劣化することもない。In this way, in this embodiment, the bands of the driver (2) and amplifier (5) are narrowed when receiving standard television broadcasting, so unnecessary radiation of harmonics is reduced.
This eliminates the problem of heat generation from the transistors used, and there is no deterioration in image quality.
なお、上述の実施例では制御端子（１１）に得られるモ
ード切換信号は標準テレビジョン放送受像時にハイレベ
ノへ高品位テレビジョン放送受像時にローレベルの場合
について説明したが、逆の場合でもよく、そのときはハ
イレベル時スイッチ回路（４）は開放、スイッチ回路（
９）は開成、逆にローレベル時スイッチ回路（４）は閉
成、スイッチ回路（９）は開放となるように構成すれば
よい。In the above embodiment, the mode switching signal obtained at the control terminal (11) is set to high level when receiving standard television broadcasting and to low level when receiving high definition television broadcasting. When the level is high, the switch circuit (4) is open, and the switch circuit (4) is open.
9) may be open, and conversely, the switch circuit (4) may be closed and the switch circuit (9) may be open at low level.
上述の如くこの発明によれば標準テレビジョン放送と高
品位テレビジョン放送とを受像可能なテレビジョン受像
機において、受信放送の方式に応じて映像出力回路の周
波数特性を切り換えるようにしたので、標準テレビジョ
ン放送を受信する際における映像出力回路からの高調波
の不要輻射を低減できると共に、映像出力回路に使用さ
れているトランジスタの発熱を軽減でき、しかも画質の
劣化を防止することができる。As described above, according to the present invention, in a television receiver capable of receiving standard television broadcasting and high-definition television broadcasting, the frequency characteristics of the video output circuit are switched according to the received broadcasting system. Unnecessary harmonic radiation from a video output circuit when receiving television broadcasting can be reduced, heat generation of transistors used in the video output circuit can be reduced, and deterioration of image quality can be prevented.
図面の簡単な説明
第１図はこの発明の一実施例を示す回路構成図、第２図
は第１図の動作説明に供するための特性図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a characteristic diagram for explaining the operation of FIG.
（２）はドライバ、（３）はシャープネスＶ Ｒ、（４
）、 （９）はスイッチ回路、（５）は増幅器、（８）
はエミッタピーキング回路、（１０）は受像管である。(2) is the driver, (3) is the sharpness VR, (4
), (9) is a switch circuit, (5) is an amplifier, (8)
is an emitter peaking circuit, and (10) is a picture tube.
Claims (1)
像可能なテレビジョン受像機において、受信放送の方式
に応じて映像出力回路の周波数特性を切り換えるように
したことを特徴とするテレビジョン受像機。A television receiver capable of receiving standard television broadcasting and high-definition television broadcasting, characterized in that the frequency characteristics of a video output circuit are switched according to the received broadcasting system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1135006A JP2847754B2 (en) | 1989-05-29 | 1989-05-29 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1135006A JP2847754B2 (en) | 1989-05-29 | 1989-05-29 | Television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02312465A true JPH02312465A (en) | 1990-12-27 |
| JP2847754B2 JP2847754B2 (en) | 1999-01-20 |
Family
ID=15141727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1135006A Expired - Fee Related JP2847754B2 (en) | 1989-05-29 | 1989-05-29 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847754B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6400418B1 (en) | 1998-09-28 | 2002-06-04 | Mitsubishi Denki Kabushiki Kaisha | Image display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5652374U (en) * | 1979-09-28 | 1981-05-08 | ||
| JPS57119568A (en) * | 1981-01-16 | 1982-07-26 | Matsushita Electric Ind Co Ltd | Television receiver |
| JPS62139176U (en) * | 1986-02-24 | 1987-09-02 | ||
| JPS6312986U (en) * | 1986-07-10 | 1988-01-28 |
-
1989
- 1989-05-29 JP JP1135006A patent/JP2847754B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5652374U (en) * | 1979-09-28 | 1981-05-08 | ||
| JPS57119568A (en) * | 1981-01-16 | 1982-07-26 | Matsushita Electric Ind Co Ltd | Television receiver |
| JPS62139176U (en) * | 1986-02-24 | 1987-09-02 | ||
| JPS6312986U (en) * | 1986-07-10 | 1988-01-28 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6400418B1 (en) | 1998-09-28 | 2002-06-04 | Mitsubishi Denki Kabushiki Kaisha | Image display device |
| US6670998B2 (en) | 1998-09-28 | 2003-12-30 | Mitsubishi Denki Kabushiki Kaisha | Image display device with controlled image quality |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2847754B2 (en) | 1999-01-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |