JPH04114583A - Multi-system television receiver incorporating teletext multiplex receiver - Google Patents
Multi-system television receiver incorporating teletext multiplex receiverInfo
- Publication number
- JPH04114583A JPH04114583A JP23332790A JP23332790A JPH04114583A JP H04114583 A JPH04114583 A JP H04114583A JP 23332790 A JP23332790 A JP 23332790A JP 23332790 A JP23332790 A JP 23332790A JP H04114583 A JPH04114583 A JP H04114583A
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- video
- receiver
- signal
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- switch
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- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 13
- 101001097860 Lithospermum erythrorhizon Phenylalanine ammonia-lyase 1 Proteins 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 20
- 238000012545 processing Methods 0.000 description 11
- 101000959126 Xenopus laevis Peptidyl-alpha-hydroxyglycine alpha-amidating lyase B Proteins 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 4
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- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、映像信号の忠実な再生をするチャンネル帯域
が６ＭＨｚないし８ＭＨｚの複数の方式のテレビ信号が
受信可能で一方式の文字多重受信機内蔵多方式テレビ受
像機に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention provides a one-way text multiplex receiver capable of receiving television signals of multiple systems with a channel band of 6 MHz to 8 MHz for faithfully reproducing video signals. This invention relates to a built-in multi-system television receiver.
（従来の技術）
近年、海外市場において、文字多重放送を行う国が増え
てきている。しかし実際には、周波数帯域と放送方式、
クロマ方式との関係は、ＶＨＦにおいて、帯域６ＭＨｚ
ではクロマ方式でＮＴＳＣ。(Prior Art) In recent years, an increasing number of countries in overseas markets are implementing teletext broadcasting. However, in reality, the frequency band and broadcasting method,
The relationship with the chroma method is that in VHF, the band is 6MHz.
Then NTSC with chroma method.
ＰＡＬの放送方式があり、帯域７ＭＨｚでは、クロマＢ
方式でＰＡＬ、ＳＥＣＡＭの放送方式であり、さらに帯
域８ＭＨｚではクロマＤ方式と１方式で、Ｄ方式ではＰ
ＡＬとＳＥＣＡＭ、■方式ではＰＡＬの放送方式がある
。さらに、文字多重放送信号としてＢ方式の***方式等
および１方式の英国方式等がある。そして、ＰＡＬおよ
びＳＥＣＡＭ方式を採用している国では、複数のテレビ
信号が受信可能な多方式テレビ受像機が商品化され販売
されている。There is a PAL broadcasting system, and in the band 7MHz, Chroma B
Broadcasting systems are PAL and SECAM, and in the 8MHz band, Chroma D system and 1 system are used, and D system is PAL and SECAM broadcasting systems.
There are AL, SECAM, and PAL broadcasting systems. Further, as teletext signals, there are B system, such as the West German system, and 1 system, such as the British system. In countries that have adopted the PAL and SECAM systems, multi-system television receivers capable of receiving a plurality of television signals have been commercialized and sold.
従来、多方式テレビ受像機が、文字多重受信機を内蔵し
なかったのは、需要が少なかったせいである。さらに、
各方式において文字多重受信に必要な映像信号の忠実再
生をすることが、複雑で費用もかかるからである。Conventionally, multi-format television receivers did not have built-in text multiplex receivers because there was little demand for them. moreover,
This is because faithfully reproducing the video signal necessary for text multiplex reception in each system is complicated and expensive.
文字多重受信機を内蔵する場合、特に映像検波出力の振
幅特性および位相特性は、送信側の特性に近似させる必
要がある。この特性は、ＰＬＬ方式完全同期検波ＩＣを
採用している今日、チューナとＩＦフィルタの特性によ
ってほとんど決定される。また、テレビ受像機のＩＦフ
ィルタとしては、ＳＡＷフィルタが一般的である。ＳＡ
Ｗフィルタは、振幅特性と位相特性が別々に設計ができ
るため映像信号の忠実再生を行う特性が容易に実現でき
る。When a text multiplexing receiver is installed, the amplitude characteristics and phase characteristics of the video detection output must be made to approximate the characteristics of the transmitting side. These characteristics are mostly determined by the characteristics of the tuner and IF filter in today's world where PLL type fully synchronous detection ICs are used. Further, a SAW filter is commonly used as an IF filter for a television receiver. S.A.
Since the W filter can be designed with amplitude characteristics and phase characteristics separately, characteristics for faithfully reproducing video signals can be easily realized.
従来の文字多重受信機内蔵テレビ受像機の映像信号処理
について説明する。Video signal processing of a conventional television receiver with a built-in text multiplex receiver will be described.
第８図は、従来の文字多重受信機内蔵テレビ受像機の映
像信号処理を示すブロック図である。１はチューナ、２
はＩＰフィルタ、３は映像中間増幅器、４は映像検波器
、６は映像増幅器、７は文字多重受信機、８は信号切り
替え器、９はデイスプレィである。以上のように構成さ
れたテレビ受像機の映像信号処理について説明する。FIG. 8 is a block diagram showing video signal processing of a conventional television receiver with a built-in character multiplex receiver. 1 is tuner, 2
3 is an IP filter, 3 is a video intermediate amplifier, 4 is a video detector, 6 is a video amplifier, 7 is a text multiplex receiver, 8 is a signal switch, and 9 is a display. Video signal processing of the television receiver configured as above will be explained.
まず、チューナ１に入力されたテレビ信号は、中間周波
に変換される。そして、ＩＦフィルタ２で振幅と位相の
フィルタがかけられ映像中間増幅器３に入力される。こ
こでは、出力が一定になるようにＡＧＣ回路が含まれて
いる。一定の値に増幅された中間周波のテレビ信号は、
映像検波器４により検波され映像信号となる。映像検波
信号のうち、映像情報は必要な量だけ映像増幅器６で増
幅され信号切り替え器８に入力され、文字情報は文字多
重受信機７で処理され信号切り替え器８に入力される。First, a television signal input to the tuner 1 is converted to an intermediate frequency. The signal is then subjected to amplitude and phase filtering by an IF filter 2 and input to a video intermediate amplifier 3. Here, an AGC circuit is included so that the output is constant. An intermediate frequency television signal amplified to a certain value is
It is detected by the video detector 4 and becomes a video signal. Of the video detection signals, video information is amplified by a necessary amount by a video amplifier 6 and input to a signal switch 8, and text information is processed by a text multiplex receiver 7 and input to a signal switch 8.
映像信号と文字信号は、信号切り替え器８で切り替えあ
るいは合成されたのち、デイスプレィ９に入力され映像
となる。The video signal and character signal are switched or combined by a signal switch 8, and then input to a display 9 to form a video.
複数のテレビ信号が受信可能な多方式テレビ受像機にお
いて、それぞれの映像検波出力を得るためＩＦフィルタ
・映像増幅器・映像検波器を複数用いて処理する方法と
、一つで処理する方法とがある。一つで処理する場合の
ＩＦフィルタは、ＳＡＷフィルタと切り替え方式のトラ
ップ回路で構成する方法が一般的である。多くの多方式
テレビ受像機は後者の方法を採用している。In a multi-system television receiver capable of receiving multiple television signals, there are two methods: processing using multiple IF filters, video amplifiers, and video detectors to obtain the respective video detection outputs, and processing using one. . When processing with one IF filter, it is common to configure it with a SAW filter and a switching type trap circuit. Many multi-system television receivers employ the latter method.
（発明が解決しようとする課ＩＩり
しかしながら上記のような構成の文字多重受信機内蔵テ
レビ受像機において、上記の一般的な方法で多方式化を
行うと、映像検波信号の位相特性はほとんどＩＦフィル
タで決まり、送信側で特性の異なるテレビ信号をそれぞ
れ最良の位相特性で映像検波できずすべての方式におい
て十分な特性が出せるように設計できないという欠点を
有していた。(Problem to be Solved by the Invention II) However, if a television receiver with a built-in text multiplex receiver configured as described above is multi-spatted using the general method described above, the phase characteristics of the video detection signal will almost always change to IF. The problem is that it is not possible to detect television signals with different characteristics on the transmitting side with the best phase characteristics, and it is not possible to design a system that provides sufficient characteristics in all systems.
本発明の目的は従来欠点を解消し、複数の方式の異なる
テレビ信号に対し希望の位相特性を持った映像検波出力
を再生し、映像信号と文字信号を処理し映像化する多方
式テレビ受像機を提供することである。The purpose of the present invention is to solve the conventional drawbacks and to provide a multi-system television receiver that reproduces a video detection output having a desired phase characteristic for television signals of different systems, processes the video signals and character signals, and converts them into images. The goal is to provide the following.
（課題を解決するための手段）
本発明の文字多重受信機内蔵テレビ受像機は、映像検波
出力後に位相等価器とスイッチを有するものである。こ
の位相等価器は、一つのＩＦフィルタだけでは実現でき
ない複数の位相特性を映像検波出力で実現し、各方式の
目標位相特性を実現するものである。また、位相等価器
を通過するがしないか、さらに複数設けた位相等価器の
どれを通過するのかをスイッチにより選択する。(Means for Solving the Problems) A television receiver with a built-in character multiplex receiver according to the present invention has a phase equalizer and a switch after outputting a video detection signal. This phase equalizer uses the video detection output to realize a plurality of phase characteristics that cannot be achieved with only one IF filter, and realizes the target phase characteristics of each system. In addition, a switch is used to select whether the signal passes through a phase equalizer or not, and which of a plurality of phase equalizers the signal passes through.
（作 用）
本発明は、上記した構成によって一つしかＩＦフィルタ
をもたない文字多重受信機内蔵多方式テレビ受像機でも
、各方式で希望の位相特性を持つ映像検波出力が得られ
、映像信号と文字信号の忠実な再生が可能となる。(Function) According to the present invention, even in a multi-system television receiver with a built-in character multiplexing receiver that has only one IF filter, a video detection output having a desired phase characteristic can be obtained for each system by using the above-described configuration. Faithful reproduction of signals and character signals becomes possible.
（実施例）
以下本発明の一実施例の文字多重受信機内蔵多方式テレ
ビ受像機の映像信号処理について図面を参照して説明す
る。第１図は本発明の実施例における映像信号処理のブ
ロック図を示すものである。(Embodiment) Hereinafter, video signal processing of a multi-system television receiver with a built-in text multiplex receiver according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of video signal processing in an embodiment of the present invention.
第２図は第１図における位相等側蓋とスイッチの一具体
例を示すものである。FIG. 2 shows a specific example of the phase equal-side cover and switch in FIG. 1.
第１図の実施例はチャンネル帯域が７ＭＨｚのＰＡＬ−
Ｂと８Ｍ比のＰＡＬ−Ｉのテレビ信号が受信可能でＰＡ
Ｌ−ｒ方式の文字多重受信機を内蔵した受像機の映像信
号処理のブロック図であり、これについて動作の説明を
する。１はチューナでＰＡＬ−Ｂ −ＰＡＬ−Ｉ両方式
が受信可能である。The embodiment shown in Fig. 1 is a PAL-
B and 8M ratio PAL-I TV signals can be received and PA
It is a block diagram of video signal processing of a receiver incorporating an L-r type character multiplex receiver, and the operation thereof will be explained. 1 is a tuner that can receive both PAL-B and PAL-I systems.
２はＩＦフィルタでＰＡＬ−Ｂ −ＰＡＬ−１両方式に
対応した隣接音声トラップ・隣接映像トラップが設定さ
れており振幅特性はナイキスト特性を持ち、位相特性は
ＰＡＬ−Ｂの送信特性の逆特性の郡遅延特性を持つ。３
は映像中間増幅器で出力振幅が一定になるＡＧＣ動作を
もつ。４は映像検波器である。３と４はＶＩＦ用ＩＣと
して一つになっている。４の出力である映像信号はＰＡ
Ｌ−ＢでもＰＡＬ−Ｉでも振幅だが位相はＰＡＬ−Ｂを
受信したときに平坦な郡遅延特性になる。ＰＡＬ−Ｂと
ＰＡＬ−Ｉでは送信側の郡遅延特性が違うのでＰＡＬ−
Ｉを受信したときの映像検波出力の郡遅延特性は平坦で
はなく２ＭＨｚ付近で９０ｎ ｓｅｃ進んだ特性になる
。このにょうな特性の信号を文字多重受信機に入力し信
号処理すると誤り率がＰＡＬ−Ｂを受信したときに比べ
悪化する。2 is an IF filter that is set with adjacent audio traps and adjacent video traps compatible with both PAL-B and PAL-1 systems.The amplitude characteristic has a Nyquist characteristic, and the phase characteristic is the inverse characteristic of the PAL-B transmission characteristic. It has group delay characteristics. 3
has an AGC operation that keeps the output amplitude constant at the video intermediate amplifier. 4 is a video detector. 3 and 4 are integrated as a VIF IC. The video signal output from 4 is PA
Although the amplitude is the same for both LB and PAL-I, the phase becomes a flat group delay characteristic when PAL-B is received. PAL-B and PAL-I have different delay characteristics on the transmitting side, so PAL-B and PAL-I have different group delay characteristics.
The group delay characteristic of the video detection output when I is received is not flat, but has a characteristic that is advanced by 90 nsec around 2 MHz. When a signal with such characteristics is input to a text multiplex receiver and processed, the error rate becomes worse than when receiving PAL-B.
そこで映像検波器４の出力に位相等価器とスイッチ５を
設けＰＡＬ−１を受信したときにも平坦な郡遅延特性の
映像信号を文字多重受信機７と映像増幅器６に入力する
。なお、位相等価器とスイッチ５は第２図に示すように
コイル５ａ、 ５ｂ、コンデンサ５ｃ、 ５ｄ、
トランジスタ５ｅ、５ｆを直並列接続することによって
構成することができる。コイルとコンデンサの容量を適
当に選ぶことでＰＡＬ−１を受信したとき２ＭＨｚ付近
で９０ ｎ ｓｅｃ進んでいた郡遅延特性を平坦な特性
にできる。またＰＡＬ−Ｉを受信しているときはトラン
ジスタ５ｅをオフ、トランジスタ５ｆをオンするように
ベースにそれぞれバイアスを加え、ＰＡＬ−Ｂを受信し
ているときはトランジスタ５ｅをオン、トランジスタ５
ｆをオフするようベースにバイアスを加える。位相等価
器とスイッチを通過した信号のうち映像信号は映像増幅
器６で必要な量だけ増幅され、又、文字信号は文字多重
受信機７で処理され、それぞれ信号切り替え器８に入力
され切り替えあるいは合成された後デイスプレィ９に入
力され映像となる。Therefore, a phase equalizer and a switch 5 are provided at the output of the video detector 4 so that even when PAL-1 is received, a video signal with a flat group delay characteristic is input to the character multiplexing receiver 7 and the video amplifier 6. The phase equalizer and switch 5 are composed of coils 5a, 5b, capacitors 5c, 5d, and
It can be constructed by connecting transistors 5e and 5f in series and parallel. By appropriately selecting the capacitance of the coil and capacitor, it is possible to flatten the group delay characteristic, which was 90 nsec ahead around 2 MHz when receiving PAL-1. Also, when receiving PAL-I, a bias is applied to the bases so as to turn off transistor 5e and turn on transistor 5f, and when receiving PAL-B, turn on transistor 5e and turn on transistor 5f.
Add bias to the base to turn f off. Among the signals that have passed through the phase equalizer and switch, the video signal is amplified by the necessary amount in the video amplifier 6, and the character signal is processed in the character multiplex receiver 7, and each input to the signal switch 8 for switching or combining. After that, it is input to the display 9 and becomes an image.
念のため、周波数帯域、放送方式の異る数例について、
本発明の回路の作用について簡単に説明する。Just to be sure, here are some examples of different frequency bands and broadcasting methods:
The operation of the circuit of the present invention will be briefly explained.
第２図の（２−１）は位相等価器とスイッチ５の具体例
を示す回路図、（２−２）は位相補償特性の切換えを示
すブロック図で、選局マイコンから帯域切換信号が、Ｐ
ＮＰ トランジスタ５ｅのベースと、ＮＰＮ トランジ
スタ５ｆのベースに同時に印加される。上記の帯域切換
信号は、ＨｉｇｈレベルかＬｏｗレベルの何れかであり
、Ｈｉｇｈレベル信号の時はＰＮＰ トランジスタ５ｅ
をオフにし、ＮＰＮトランジスタ５ｆをオンにし、Ｌｏ
ｗレベル信号の時は、ＰＮＰ トランジスタ５ｅをオン
にし、ＮＰＮトランジスタ５ｆをオフにする。その結果
、（２−２）に示す位相等価器とスイッチ５の５ａかも
５ｂの特性の出力が出る。(2-1) in FIG. 2 is a circuit diagram showing a specific example of the phase equalizer and switch 5, and (2-2) is a block diagram showing switching of the phase compensation characteristic. P
It is simultaneously applied to the base of the NP transistor 5e and the base of the NPN transistor 5f. The above band switching signal is either High level or Low level, and when it is a High level signal, the PNP transistor 5e
is turned off, NPN transistor 5f is turned on, and Lo
When the signal is at W level, the PNP transistor 5e is turned on and the NPN transistor 5f is turned off. As a result, an output having the characteristics of the phase equalizer and the switch 5 5a or 5b shown in (2-2) is produced.
第３図は、ＩＦフィルタ回路の具体例で、周波数帯域に
より、スイッチング回路３ａが図示のように切り換わる
。FIG. 3 shows a specific example of an IF filter circuit, in which a switching circuit 3a is switched as shown in the figure depending on the frequency band.
第４図は、フィルタ特性とトラップ特性の周波数帯域に
関連した差異について示したもので、選局マイコンから
の制御信号により、コンデンサを並列に接続することに
より６ＭＨｚトラップの位置が７〜８ＭＨｚトラップの
位置となる。Figure 4 shows the difference between filter characteristics and trap characteristics related to the frequency band. By connecting capacitors in parallel, the position of the 6MHz trap can be changed from that of the 7 to 8MHz trap using a control signal from the tuning microcomputer. position.
第５図は送信側の周波数帯域別位置補償特性を示す図で
、周波数帯域によって、例えば（５−１）。FIG. 5 is a diagram showing position compensation characteristics for each frequency band on the transmitting side, for example (5-1).
（５−２）、 （５−３）図のように変る。(5-2), (5-3) changes as shown in the figure.
第６図は、７ＭＨｚＢ方式の信号受信時の特性図で、（
６−１）図の送信側特性を（６−２）図の特性のフィル
タで補償して（６−３）図のようなフラットな特性の総
合出力を得ることを示す。Figure 6 shows the characteristics when receiving a 7MHzB signal.
6-1) Compensating the transmission side characteristics shown in the diagram (6-2) with a filter having the characteristics shown in the diagram (6-3) shows that a total output with a flat characteristic as shown in the diagram is obtained.
第７図はＳＭＨｚＩ方式の（７−１）図の送信側特性の
場合、フィルタ特性が（７−２）図のようであるので、
（７−３）図のような位相補償特性の補償を行って、（
７−４）図のようなフラットな総合特性を得ることを示
す。Figure 7 shows that in the case of the transmission side characteristic of the SMHzI system as shown in figure (7-1), the filter characteristic is as shown in figure (7-2), so
(7-3) By compensating the phase compensation characteristic as shown in the figure, (
7-4) Show that flat overall characteristics as shown in the figure can be obtained.
（発明の効果）
本発明によれば、複数の方式のテレビジョン信号を受信
でき且つ文字多重受信機内蔵多方式テレビ受像機の映像
検波出力端と映像増幅器の間に位相等価器とスイッチを
設けることにより複数のテレビ信号の映像信号と文字信
号の忠実再生が可能であり、その実用上の効果は大であ
る。(Effects of the Invention) According to the present invention, a phase equalizer and a switch are provided between the video detection output terminal and the video amplifier of a multi-system television receiver that can receive television signals of a plurality of systems and has a built-in character multiplexing receiver. This makes it possible to faithfully reproduce the video signals and character signals of a plurality of television signals, which has great practical effects.
第１図は本発明の実施例における文字多重受信機内蔵多
方式テレビ受像機の信号処理を示すブロック図、第２図
は位相等価器とスイッチの具体例を示す回路図、第２図
において、２−１は位相等価器とスイッチの具体例を示
す回路図、２−２は位相補償特性の切換えを示すブロッ
ク図、第３図は１Ｆフィルタ回路の具体回路図、第４図
はフィルタ特性とトラップ特性とを示す特性図、第５図
は送信側の帯域別位相補償特性を示す特性図、第６図は
７ＭＨｚＢ方式信号受信時の特性図、第７図は７ＭＨｚ
Ｂ方式に対するフィルタ特性において、ＳＭＨｚＩ方式
信号受信時の位相補償を示す特性図、第８図は従来の文
字多重受信機内蔵テレビ受像機の映像信号処理を示すブ
ロック図である。
１ ・・・チューナ、 ２ ・・・ ＩＦフィルタ、３
・・・映像中間増幅器、 ４ ・・・映像検波器、
５・・・位相等価器・スイッチ、 ５ａ。
５ｂ・・・コンデンサ、 ５ｃ、５ｄ・・・コイル、
５ｅ、５ｆ・・・ トランジスタ、 ６ ・・・映像増
幅器、 ７ ・・・文字多重受信機、８ ・・・信号切
り替え器、 ９ ・・・デイスプレィ。
特許出願人 松下電器産業株式会社FIG. 1 is a block diagram showing signal processing of a multi-system television receiver with a built-in character multiplex receiver in an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific example of a phase equalizer and a switch, and in FIG. 2-1 is a circuit diagram showing a specific example of a phase equalizer and a switch, 2-2 is a block diagram showing switching of phase compensation characteristics, FIG. 3 is a specific circuit diagram of a 1F filter circuit, and FIG. 4 is a diagram showing filter characteristics. Figure 5 is a characteristic diagram showing the phase compensation characteristics for each band on the transmitting side, Figure 6 is a characteristic diagram when receiving a 7MHzB system signal, and Figure 7 is a characteristic diagram showing the 7MHz signal.
In the filter characteristics for the B method, a characteristic diagram showing phase compensation when receiving an SMHZ I method signal is shown. FIG. 8 is a block diagram showing video signal processing of a conventional television receiver with a built-in character multiplex receiver. 1... Tuner, 2... IF filter, 3
...Video intermediate amplifier, 4 ...Video detector,
5... Phase equalizer/switch, 5a. 5b... Capacitor, 5c, 5d... Coil,
5e, 5f...Transistor, 6...Video amplifier, 7...Character multiplex receiver, 8...Signal switcher, 9...Display. Patent applicant Matsushita Electric Industrial Co., Ltd.
Claims (4)
式のテレビ信号が受信可能で一方式の文字多重受信機を
内蔵した受像機の映像検波出力端と映像増幅器の間に位
相等価器とスイッチを設け、受信方式に応じ映像帯域の
位相補正を行うことを特徴とする文字多重受信機内蔵多
方式テレビ受像機。(1) A phase equalizer and switch are installed between the video detection output terminal and the video amplifier of a receiver that can receive television signals of multiple systems with channel bands of 7MHz and 8MHz and has a built-in one-way text multiplex receiver. A multi-system television receiver with a built-in character multiplexing receiver, characterized in that it performs phase correction of the video band according to the reception method.
式のテレビ信号が受信可能で複数方式の文字多重受信機
を内蔵した受像機の映像検波出力端と映像増幅器の間に
位相等価器とスイッチを設け、受信方式に応じ映像帯域
の位相補正を行うことを特徴とする文字多重受信機内蔵
多方式テレビ受像機。(2) A phase equalizer and switch are installed between the video detection output terminal and the video amplifier of a receiver that can receive television signals of multiple formats with channel bands of 7MHz and 8MHz and has a built-in multiplex text receiver. A multi-system television receiver with a built-in character multiplexing receiver, characterized in that it performs phase correction of the video band according to the reception method.
の複数の方式のテレビ信号が受信可能で一方式の文字多
重受信機を内蔵した受像機の映像検波出力端と映像増幅
器の間に位相等価器とスイッチを設け、受信方式に応じ
映像帯域の位相補正を行うことを特徴とする文字多重受
信機内蔵多方式テレビ受像機。(3) Channel bands are 6MHz, 7MHz and 8MHz
A phase equalizer and switch are installed between the video detection output terminal and the video amplifier of a receiver that can receive television signals of multiple formats and has a built-in one-way text multiplex receiver, and the phase of the video band is adjusted according to the reception method. A multi-system television receiver with a built-in character multiplexing receiver, which is characterized by performing correction.
の複数の方式のテレビ信号が受信可能で複数方式の文字
多重受信機を内蔵した受像機の映像検波出力端と映像増
幅器の間に位相等価器とスイッチを設け、受信方式に応
じ映像帯域の位相補正を行うことを特徴とする文字多重
受信機内蔵多方式テレビ受像機。(4) Channel bands are 6MHz, 7MHz and 8MHz
A phase equalizer and a switch are installed between the video detection output terminal and the video amplifier of a receiver that can receive TV signals of multiple formats and has a built-in character multiplex receiver for multiple formats, and the phase of the video band is adjusted according to the reception method. A multi-system television receiver with a built-in character multiplexing receiver, which is characterized by performing correction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2233327A JP2932090B2 (en) | 1990-09-05 | 1990-09-05 | Multi-system TV receiver with built-in character multiplex receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2233327A JP2932090B2 (en) | 1990-09-05 | 1990-09-05 | Multi-system TV receiver with built-in character multiplex receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04114583A true JPH04114583A (en) | 1992-04-15 |
| JP2932090B2 JP2932090B2 (en) | 1999-08-09 |
Family
ID=16953407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2233327A Expired - Fee Related JP2932090B2 (en) | 1990-09-05 | 1990-09-05 | Multi-system TV receiver with built-in character multiplex receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2932090B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07203397A (en) * | 1993-12-28 | 1995-08-04 | Nec Corp | Teletext receiver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01141473A (en) * | 1987-11-27 | 1989-06-02 | Matsushita Electric Ind Co Ltd | Television receiver |
-
1990
- 1990-09-05 JP JP2233327A patent/JP2932090B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01141473A (en) * | 1987-11-27 | 1989-06-02 | Matsushita Electric Ind Co Ltd | Television receiver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07203397A (en) * | 1993-12-28 | 1995-08-04 | Nec Corp | Teletext receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2932090B2 (en) | 1999-08-09 |
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