JPH0346467A - Video signal switching circuit - Google Patents
Video signal switching circuitInfo
- Publication number
- JPH0346467A JPH0346467A JP18030189A JP18030189A JPH0346467A JP H0346467 A JPH0346467 A JP H0346467A JP 18030189 A JP18030189 A JP 18030189A JP 18030189 A JP18030189 A JP 18030189A JP H0346467 A JPH0346467 A JP H0346467A
- Authority
- JP
- Japan
- Prior art keywords
- amplitude
- signal
- video signal
- video
- switching 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.)
- Pending
Links
Landscapes
- Studio Circuits (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、テレビジラン受信機に係シ、特に、２つの映
像記号を進択的切夛換える映像信号切換回路に関するも
のである〇
〔従来の技術〕
従来の映像１６号切洪回路は、日本電子機械工業会技術
ファイル’Ｉ’ＴＣ−００５「テレビジ胃ン受ｇ１機の
相互接続」に記載のように、ｌｆｋ像信号としてＲＧＢ
ｍ色（ｉ！号、切換信号として Ｙ、信号、振幅低減信
号として ＹＭ傷信号用いている。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a television receiver, and particularly relates to a video signal switching circuit for selectively switching between two video symbols. [Technology] The conventional video No. 16 Kirihong circuit, as described in the Japan Electronics Industry Association technical file 'I'TC-005 "Interconnection of one television receiver", can output RGB as an LFK image signal.
M color (i! number), Y signal is used as the switching signal, and YM scratch signal is used as the amplitude reduction signal.
テレビジラン受信機と文字放送アダプタの組合せを例と
して考えると、 Ｙｓ（１号はテレビジラン映像とＸ字
放送映像の切す換えを行う切換信号として用いられ、
Ｙｇ信号を高速に切シ換えることによう字幕番組のよ
うにテレビジ冒ン映像を背景にして文字放送ｒ！！に像
をスーパーインボーズ表示スることも可能としている０
なか、 ＹＭ傷信号、上記スーパーインホーズ表示時に
背景となるテレビジョン映蝕の一部を振幅低減させてハ
ー７トーンとし文字放送映像を識別し易くする振幅低減
信号として用いられる。Taking the combination of a TVJLAN receiver and a teletext adapter as an example, Ys (No. 1 is used as a switching signal to switch between TVJLAN video and X-character broadcast video,
By switching the Yg signal at high speed, teletext r! ! It is also possible to superimpose images on
Among them, the YM scratch signal is used as an amplitude reduction signal that reduces the amplitude of a part of the television image that becomes the background during the super enhanced display to make the teletext image easier to identify.
上記従来技術では、文字放送の字幕番組などのスーパー
インポーズ表示時に、背景となるテレビジラン映像が色
飽和度の尚い映像の場合、 ＹＭ信号にようテレビジラ
ン映像の振幅を低減させても字幕番組の文字を識別しに
くいという問題があったＯ
本発明の目的は、上記のようにスーパーインポーズ表示
時に、背景の映像の色飽和度が高い場合でも、スーパー
インポーズされた映像を識別し易くすることにある。In the above conventional technology, when displaying a subtitled program such as a teletext program superimposed, if the background televised video has low color saturation, the subtitles will not be displayed even if the amplitude of the televised video is reduced to the YM signal. There was a problem that it was difficult to distinguish the characters of the program.The purpose of the present invention is to make it possible to identify the superimposed video even when the color saturation of the background video is high during superimposed display as described above. The purpose is to make it easier.
上記目的を達成するために、背景となる第１の映像信号
に対し、スーパーインポーズ表示される第２の映像信号
の振幅を Ｙ「信号の発生期間のみ、標準振幅以上に増
大させる振幅増幅回路を設けたものである。In order to achieve the above purpose, an amplitude amplification circuit that increases the amplitude of the second video signal displayed superimposed on the first video signal serving as the background above the standard amplitude only during the signal generation period. It has been established.
第２の映像信号の振幅増Ｉ１１回路は、 Ｙヨ信号が発
生していない場合、りまｂ非スーパーインポーズ表示期
間では増幅度１となり１第２の映像信号の振−は標準振
幅のままであＦ）、 ＹｍＩＮ号が発生した場合、つ
筐シスーバーインボーズ表示期間のみ、第２の映像信号
の振幅を増幅し標準振幅以上とする。The amplitude increase I11 circuit of the second video signal has an amplification degree of 1 during the Rimab non-superimposed display period when the Y/Y signal is not generated.1 The amplitude of the second video signal remains at the standard amplitude. (F), when the YmIN signal occurs, the amplitude of the second video signal is amplified to exceed the standard amplitude only during the chassis rise display period.
以下、本発明の一実施例を図によう説明する。 An embodiment of the present invention will be described below with reference to the drawings.
図において、第１の映像信号入力端子１からの第１の映
像信号（例えば、テレビジ曹ン映像信号）は、Ｙｍ（１
１号入力端子５からのＹＭ信号によう働く振幅低減回路
５を通って切換スイッチ６に加えられる。−万、第２の
映像信号（例えば５文字放送映像イｄ号）は、同様にＹ
、信号によυ働く振幅増幅回路４を通って切換スイッチ
６に加えられ、切換スイッチ６は、 Ｙ、信号入力端子
７からのＹ。In the figure, the first video signal (e.g., television video signal) from the first video signal input terminal 1 is Ym(1
The YM signal from the No. 1 input terminal 5 is applied to the changeover switch 6 through an amplitude reduction circuit 5. - 10,000, the second video signal (for example, 5 character broadcast video ID number) is similarly Y
, is applied to the changeover switch 6 through the amplitude amplification circuit 4, which is operated by the signal υ, and the changeover switch 6 receives the Y signal from the signal input terminal 7.
信号によシ、第１シよび第２の映像信号を切υ換えて映
像出力端子８に出力する。Depending on the signal, the first and second video signals are switched and outputted to the video output terminal 8.
ここで、文字放送の字幕番組などのスーパーインポーズ
表示状態では、 Ｙ、信号が発生するため、背景とな
る第１の映像（テレビジラン映像）は振幅低減されるが
、スーパーインポーズされる第２の映像（文字放送映像
）は振幅増幅される。このため、スーパーインポーズ表
示状態のみ、第２の映像の振幅が標準状態よう増大し、
背景となる第１の映像の色飽和度が高い場合でも、明確
に識別可能となる０
〔発明の効果〕
本発明によれば、第１の映像信号を背景にして第２の映
像信号をスーパーインボーズ表示する映像信号切換回路
において、第１の映像信号の色飽和度の高い場合でも、
ｖｇ２の映像信号のＩｔｊＬ幅を標準振幅以上にするた
め、スーパーインボーズ表示される映像を明確に識別可
能とする効果がある。Here, in a superimposed display state such as a subtitled program of a teletext broadcast, a Y signal is generated, so the amplitude of the first video (television video) serving as the background is reduced, but the amplitude of the first video that is superimposed is reduced. The amplitude of the second video (teletext video) is amplified. Therefore, only in the superimposed display state, the amplitude of the second image increases as in the standard state,
Even when the color saturation of the first image serving as the background is high, it can be clearly identified. [Effects of the Invention] According to the present invention, the second video signal is superimposed against the background of the first video signal. In the video signal switching circuit for in-bose display, even if the first video signal has high color saturation,
Since the ItjL width of the vg2 video signal is made larger than the standard amplitude, there is an effect that the superimposed video can be clearly identified.
また、文字放送などのように、第２の映像信号が静止画
映像の場合、第２の映像信号のみ表示する非スーパーイ
ンポーズ時は静止画のためブラウン管など表示素子のド
ーミングや焼付きを発生し示時の映像信号の振幅を低減
させても、スーパーインポーズ時の文字識別が可能とな
るため、ドーミングや焼付きの発生防止も可能となる。In addition, when the second video signal is a still image, such as in teletext broadcasting, doming or burn-in of display elements such as cathode ray tubes may occur due to the still image when only the second video signal is displayed and is not superimposed. Even if the amplitude of the video signal at the time of display is reduced, characters can be identified at the time of superimposition, and it is also possible to prevent doming and burn-in from occurring.
第４図は本発明の一実施例を示すブロック図である。
１・・・第１の映像信号入力端子、２・・・第２の映像
４８号入力端子、３・・・振幅低減回路、４・・・振幅
増幅回路、５・・・Ｙｍ信号入力端子、 ６・・・切換
スイッチ、７・・・ Ｙｍ信号入力端子、８・・・映像
出力端子。FIG. 4 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... 1st video signal input terminal, 2... 2nd video No. 48 input terminal, 3... amplitude reduction circuit, 4... amplitude amplification circuit, 5... Ym signal input terminal, 6... Selector switch, 7... Ym signal input terminal, 8... Video output terminal.
Claims (1)
を、振幅低減信号に応じて低減する振幅低減手段と、該
振幅低減手段にてその振幅が低減された前記第１の映像
信号と第２の映像信号とを入力し、それら２つの映像信
号のうち、切換信号に応じて何れか一方を選択して出力
する選択手段と、を備えた映像信号切換回路において、 前記選択手段の前段に、該選択手段に入力される前記第
２の映像信号の振幅を前記振幅低減信号に応じて増幅す
る振幅増幅手段を設けたことを特徴とする映像信号切換
回路。 ２、請求項１に記載の映像信号切換回路において、前記
第１及び第２の映像信号のうち、一方または両方は、赤
、緑、青の原色信号から成ることを特徴とする映像信号
切換回路。[Claims] 1. An amplitude reduction means for inputting a first video signal and reducing the amplitude of the first video signal in accordance with an amplitude reduction signal, and the amplitude reduction means reducing the amplitude. a selection means for inputting the first video signal and the second video signal, and selecting and outputting one of the two video signals according to a switching signal. A video signal switching circuit, characterized in that an amplitude amplification means for amplifying the amplitude of the second video signal input to the selection means in accordance with the amplitude reduction signal is provided before the selection means. circuit. 2. The video signal switching circuit according to claim 1, wherein one or both of the first and second video signals consists of primary color signals of red, green, and blue. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18030189A JPH0346467A (en) | 1989-07-14 | 1989-07-14 | Video signal switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18030189A JPH0346467A (en) | 1989-07-14 | 1989-07-14 | Video signal switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0346467A true JPH0346467A (en) | 1991-02-27 |
Family
ID=16080812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18030189A Pending JPH0346467A (en) | 1989-07-14 | 1989-07-14 | Video signal switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0346467A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11065323B2 (en) * | 2008-10-27 | 2021-07-20 | Glaxosmithkline Biologicals Sa | Purification method |
-
1989
- 1989-07-14 JP JP18030189A patent/JPH0346467A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11065323B2 (en) * | 2008-10-27 | 2021-07-20 | Glaxosmithkline Biologicals Sa | Purification method |
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