JPS61136393A - Automatic scanning switch system of character multiplex broadcasting receiver - Google Patents
Automatic scanning switch system of character multiplex broadcasting receiverInfo
- Publication number
- JPS61136393A JPS61136393A JP59257560A JP25756084A JPS61136393A JP S61136393 A JPS61136393 A JP S61136393A JP 59257560 A JP59257560 A JP 59257560A JP 25756084 A JP25756084 A JP 25756084A JP S61136393 A JPS61136393 A JP S61136393A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- teletext
- circuit
- scanning
- teletext 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.)
- Pending
Links
Landscapes
- Television Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、文字多重放送受信機に係り、特に走査方式を
自動的に切換えられ、フリッカをなくすのに好適な文字
多重放送受信機の自動走査切換方式に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a teletext receiver, and in particular to an automatic scanning teletext receiver that can automatically switch the scanning method and is suitable for eliminating flicker. Regarding the switching method.
従来の文字多重放送受信機は、通常のテレビジョン受信
機と同様に、インターレス走査を行っている。文字多重
放送信号は、フィールド間で同一の情報を送っているた
め、インターレス走査により、ライン間でフリッカが目
立つという問題があった。この問題を解決する為には、
走査方式を、テレビ信号受信時と文字多重放送受信時と
で切換える必要があったが、現在まで自動的に切換える
方法がなかった０
なお、本技術分野に関連する従来技術を述べた文献とし
て、特公昭５３−２４２４５号公報を挙げることが出来
る。Conventional teletext receivers perform interlaced scanning, similar to ordinary television receivers. Since teletext signals transmit the same information between fields, there is a problem in that interlace scanning causes noticeable flicker between lines. In order to solve this problem,
It was necessary to switch the scanning method between when receiving a television signal and when receiving a teletext broadcast, but until now there was no way to switch automatically. Japanese Patent Publication No. 53-24245 can be mentioned.
本発明の目的は、文字多重放送受信機において問題とな
っていたフリッカをなくす走査線構造変換回路を、自動
かつ任意に駆動できる自動走査切換方式を提供すること
にある。SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic scan switching system that can automatically and arbitrarily drive a scan line structure conversion circuit that eliminates flicker, which has been a problem in teletext receivers.
〔発明の概要〕・
テレビジョン受信機は、インターレス走査により画像を
イ１弯成している為、インターレス方式の文字多重放送
信号（以下、丈長信号と略称することがある）を受信し
た際、それが文字９図形等の静止画である為、画面のフ
リッカが目立つ。そこで、文多信号受信時には、丈長信
号がフィールド間で同一の情報である特性を生かし、垂
直５ＹＮＣをずらすことにより、ノンインターレス方式
にし、７リツカを低減する回路が考えられる。テレビ信
号及び丈長信号を判別することにより、自動的に走査方
式を切換える回路構成を発明した。[Summary of the Invention] - Since the television receiver forms an image by interlace scanning, it cannot receive an interlace teletext signal (hereinafter sometimes referred to as long signal). When you do this, the flicker on the screen is noticeable because it is a still image such as a letter 9 figure. Therefore, when receiving a pattern signal, a circuit can be considered that takes advantage of the characteristic that the long signal has the same information between fields and shifts the vertical 5YNC to create a non-interlaced system and reduce the 7-bit error. We have invented a circuit configuration that automatically switches the scanning method by distinguishing between television signals and long signals.
以下、本発明の一実施例を第１図及び纂２図。 An embodiment of the present invention is shown in Fig. 1 and Fig. 2 below.
第５図により説明する。This will be explained with reference to FIG.
Ｎ１図は本発明の一実施例を示すブロック図であるが、
同図において、映像信号が入力した時、クロックランイ
ン信号検出回路１により、映像信号の垂直ブランキング
期間に混在する丈長信号の有無を判別する。Diagram N1 is a block diagram showing one embodiment of the present invention,
In the figure, when a video signal is input, a clock run-in signal detection circuit 1 determines whether there is a length signal mixed in the vertical blanking period of the video signal.
丈長信号は、第２図及び第３図に示すように但し、第２
図は文字多重１ｇ号の構成を示す説明図、第６図はクロ
ックランイン信号の波形図であるが、丈長信号特有のク
ロックランイン信号９と称する２、８６ Ｍ Ｈｚ １
６ビツトのパルス状の信号があり、この信号のタイミン
グに同期して、丈長信号が処理されている。However, as shown in Figures 2 and 3, the length signal is
The figure is an explanatory diagram showing the configuration of character multiplexing No. 1g, and FIG. 6 is a waveform diagram of the clock run-in signal.
There is a 6-bit pulse-like signal, and the length signal is processed in synchronization with the timing of this signal.
このクロックランイン信号部を検出し、次の積分回路２
でこの信号部を積分し、比較回路３１こて、ある値、例
えば、ペデスタルレベルから白ピークレベルまでの半分
のレベルを設定しておき、積・分された信号のレベルを
比較し、設定したレベル未満だったら、丈長信号は存在
しないと判断し、以上だったら、丈長信号が存在してい
ると判断する。Detecting this clock run-in signal part, the next integrating circuit 2
This signal part is integrated, and the comparison circuit 31 is set to a certain value, for example, half the level from the pedestal level to the white peak level, and the levels of the integrated and divided signals are compared and the set value is set. If it is less than the level, it is determined that the length signal does not exist, and if it is above the level, it is determined that the length signal is present.
この情報の伝達方法としては、１ビツトのパルスを送り
、仮にＨｉ ｇｈレベルの場合を交番信号有、 Ｉ、０
ｗレベルの場合を丈長信号無などと設定し、走査線構造
変換回路６へ送り、）（ｉｇｈレベルの場合（丈長信号
が混在している場合）は、走査線構造変換回路６により
、奇数フィールドの査を行わせ、Ｌｏｗレベルの場合（
テレビ信号のみの場合）は、インタレース走査を行わせ
る。The method of transmitting this information is to send a 1-bit pulse, and if it is at a high level, it is assumed that there is an alternating signal, I, 0.
When the signal is at w level, it is set as no length signal and sent to the scanning line structure conversion circuit 6, and when it is at the igh level (when the length signal is mixed), the scanning line structure conversion circuit 6 Check the odd field, and if it is low level (
(in the case of only television signals), interlaced scanning is performed.
′ 本実施例によれば、走査方式の切換えが自動的に
でき、これにより、現在まで問題となっていた文多信号
受信時のフリッカ防止の効果がある０
なお、第２図において、７はテレビ信号、８は丈長信号
、９はクロックランイン信号、１０ハ７レ一ミング信号
、１１は文字情報信号、を示す。' According to this embodiment, the scanning method can be automatically switched, which has the effect of preventing flicker when receiving text signals, which has been a problem up to now. A television signal, 8 a length signal, 9 a clock run-in signal, 10 C7 a timing signal, and 11 a character information signal.
本発明によれば、テレビ信号受信時にインタレース走査
９文字消号受信時にノンインタレース走査を行えるよう
自動的に切換えられ、文字信号受信時に問題となってい
たフリッカを防止する効果がある。According to the present invention, switching is automatically performed between interlaced scanning when receiving a television signal and non-interlaced scanning when receiving 9-character decoding, which has the effect of preventing flicker, which has been a problem when receiving character signals.
第１図は、本発明の一実施例を示すブロック図、ｗｃ２
図は、文字多重放送信号の構成説明図、第３図は、りａ
ツクランイン信号の波形図である０
１・・・クロックランイン信号検出回路２・・・積分回
路 ３・・・比較回路６・・・走査線構造変換回
路
７・・・テレビ信号 ８・・・文字多重放送信号９
・・・クロックランイン信号
１０・・・フレーミング信号
１１・・・文字↑吉報信号
第１７
吻３図FIG. 1 is a block diagram showing one embodiment of the present invention, wc2
The figure is an explanatory diagram of the structure of a teletext signal, and Figure 3 is a
0 which is a waveform diagram of the clock run-in signal 1...Clock run-in signal detection circuit 2...Integrator circuit 3...Comparison circuit 6...Scanning line structure conversion circuit 7...Television signal 8...Character Multiplex broadcast signal 9
... Clock run-in signal 10 ... Framing signal 11 ... Characters ↑ Good news signal No. 17 Proboscis 3
Claims (1)
文字多重放送信号を受信することのできる文字多重放送
受信機において、受信信号における文字多重放送信号の
重畳の有無を判別する手段と、有のときはその走査方式
をインターレス走査方式からノンインターレス走査方式
へ切換える自動切換手段と、を設けたことを特徴とする
文字多重放送受信機の自動走査切換方式。1) In a teletext receiver capable of receiving a television signal and a teletext signal superimposed thereon and transmitted, a means for determining whether or not a teletext signal is superimposed in the received signal; An automatic scanning switching system for a teletext broadcasting receiver, characterized in that it is provided with automatic switching means for switching the scanning system from an interlaced scanning system to a non-interlaced scanning system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59257560A JPS61136393A (en) | 1984-12-07 | 1984-12-07 | Automatic scanning switch system of character multiplex broadcasting receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59257560A JPS61136393A (en) | 1984-12-07 | 1984-12-07 | Automatic scanning switch system of character multiplex broadcasting receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61136393A true JPS61136393A (en) | 1986-06-24 |
Family
ID=17307971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59257560A Pending JPS61136393A (en) | 1984-12-07 | 1984-12-07 | Automatic scanning switch system of character multiplex broadcasting receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61136393A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100881A (en) * | 1986-10-17 | 1988-05-02 | Hitachi Ltd | Video signal recording and reproducing device |
-
1984
- 1984-12-07 JP JP59257560A patent/JPS61136393A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100881A (en) * | 1986-10-17 | 1988-05-02 | Hitachi Ltd | Video signal recording and reproducing device |
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