JPH0246146Y2 - - Google Patents
Info
- Publication number
- JPH0246146Y2 JPH0246146Y2 JP1694184U JP1694184U JPH0246146Y2 JP H0246146 Y2 JPH0246146 Y2 JP H0246146Y2 JP 1694184 U JP1694184 U JP 1694184U JP 1694184 U JP1694184 U JP 1694184U JP H0246146 Y2 JPH0246146 Y2 JP H0246146Y2
- Authority
- JP
- Japan
- Prior art keywords
- teletext
- television
- channel selection
- receiver
- 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 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Television Systems (AREA)
Description
【考案の詳細な説明】
〈技術分野〉
本考案はテレビジヨン映像信号の垂直帰線消去
期間を利用し、その一水平走査期間を単位長とす
るデータパケツトにより伝送されてくる文字（多
重）信号を受信することができる文字放送受信機
に係り、特には文字放送デコーダ部のリセツト回
路に関するものである。[Detailed description of the invention] <Technical field> The present invention utilizes the vertical blanking period of a television video signal to process character (multiplex) signals transmitted in data packets whose unit length is one horizontal scanning period. The present invention relates to a teletext receiver capable of receiving teletext broadcasts, and particularly relates to a reset circuit of a teletext decoder section.
〈背景技術〉
一般に、文字放送受信機には通常のテレビジヨ
ン放送を受信するためのテレビジヨン受信部と、
このテレビジヨン放送に多重して送られてくる文
字放送を受信するための文字放送デコーダ部とを
有しており、ユーザーは所望によりテレビジヨン
放送画面と文字放送画面とを適宜選択して視聴す
ることができる。<Background Art> Generally, a teletext receiver includes a television receiving section for receiving normal television broadcasts, and
The system is equipped with a teletext decoder unit for receiving the teletext multiplexed with the teletext broadcast, and the user can select and view the teletext screen and the teletext screen as desired. be able to.
また現在ではテレビジヨン放送チヤンネルの全
てに亘つて文字放送が多重されているのではな
く、特定の放送チヤンネルのみしか多重放送が行
なわれていない。 Furthermore, at present, teletext is not multiplexed over all television broadcast channels, but only on specific broadcast channels.
従つて、従来の文字放送受信機では、選局操作
時に特に文字放送受信状態から一般のテレビジヨ
ン放送チヤンネルに切換えた際等に、スムーズな
切換動作が行なわれず、それまでの文字放送画面
が残り、一般のテレビジヨン放送画面が妨げられ
る惧れがあつた。 Therefore, with conventional teletext receivers, during channel selection, especially when switching from teletext reception to a general television broadcast channel, the switching operation is not smooth, and the previous teletext screen remains. , there was a fear that general television broadcast screens would be blocked.
〈目的〉
本考案はこのような点に鑑みなされたものであ
り、文字放送受信機において選局操作時の誤動作
を防止し速やかに切換動作を行なうことを目的と
するものである。<Purpose> The present invention was devised in view of the above points, and its purpose is to prevent malfunctions during channel selection operations in a teletext receiver and to quickly perform switching operations.
〈実施例〉 以下本考案の実施例に従つて説明する。<Example> Embodiments of the present invention will be described below.
図面は本考案の一実施例のブロツク図を示すも
のであり、この実施例の文字放送受信機は通常の
テレビジヨン放送を受信するためのテレビジヨン
受信部１と、このテレビジヨン放送に多重して送
られてくる文字放送を受信するための文字放送デ
コーダ部２とを有している。そしてこのテレビジ
ヨン受信部１は通常一般のテレビジヨン受像機と
同様にチユーナ３、選局回路４、IF・検波回路
５、及びAFT回路６、テレビ信号処理回路７、
及びCRT（陰極線管）８を有するとともに、さら
に前記テレビ信号処理回路７から得られるテレビ
ジヨン映像信号と文字放送デコーダ部２より得ら
れる文字信号とを切換えてCRT８に出力するテ
レビ／文字信号切換回路９を備えている。 The drawing shows a block diagram of an embodiment of the present invention, and the teletext receiver of this embodiment includes a television receiving section 1 for receiving ordinary television broadcasting, and a television receiving section 1 for multiplexing this television broadcasting. It has a teletext decoder section 2 for receiving teletext sent by the user. The television receiving section 1 includes a tuner 3, a channel selection circuit 4, an IF/detection circuit 5, an AFT circuit 6, a television signal processing circuit 7,
and a CRT (cathode ray tube) 8, and further switches between a television video signal obtained from the television signal processing circuit 7 and a character signal obtained from the teletext decoder section 2 and outputs the same to the CRT 8. It is equipped with 9.
一方文字放送デコーダ部２は、前記テレビジヨ
ン受信部１のIF・検波回路５から得られる複合
映像信号から、文字信号を抜き取つて所定のデー
タ処理を行なう文字信号処理回路１０と、この処
理回路１０からの文字信号を一旦記憶するバツフ
アメモリ１１と、デコーダ部Ｂの全体の動作を制
御するCPU（中央演算処理装置）１２と、CPU１
２の特作のプログラムが予め記憶されているプロ
グラムRAM（リードオンリーメモリ）１３と、
さらにCPU１２が動作上使用するワーキング
RAM（ランダムアクセスメモリ）１４とを備え
ている。 On the other hand, the teletext decoder section 2 includes a character signal processing circuit 10 that extracts a character signal from the composite video signal obtained from the IF/detection circuit 5 of the television receiving section 1 and performs predetermined data processing, a buffer memory 11 that temporarily stores character signals from 10; a CPU (central processing unit) 12 that controls the entire operation of the decoder section B;
A program RAM (read-only memory) 13 in which a special program of No. 2 is pre-stored;
Furthermore, the working area used by the CPU 12 for operation
RAM (random access memory) 14.
上記のものから構成されるテレビジヨン受信部
１及び文字放送デコーダ部２の個々動作は従来一
般の文字放送受信機のものと特に異なるものでな
くここではその詳細な動作については省略する。 The individual operations of the television receiving section 1 and the teletext decoder section 2, which are comprised of the above components, are not particularly different from those of conventional general teletext receivers, and detailed operations thereof will be omitted here.
一般に選局回路４には汎用の選局用ICが使用
されるが、通常このような選局用ICでは選局操
作を行なうごとに50〜200msecのパルスが出力さ
れ、このようなパルスをAFT解除用及び音声ミ
ユート用として利用できるように設計されてい
る。 Generally, a general-purpose channel selection IC is used in the channel selection circuit 4, but such a channel selection IC usually outputs a pulse of 50 to 200 msec each time a channel selection operation is performed, and these pulses are processed by AFT. It is designed to be used for release and voice muting.
そこで本実施例の文字放送受信機では、特に選
局操作時にテレビジヨン受信部１の選局回路１か
らAFT解除用として導出されAFT回路６に印加
されるAFTデイフイートパルスの一部を文字放
送デコーダ部２のCPU１２のリセツト端子にも
印加するようになし、これによつてチヤンネルを
切換えるごとに文字放送デコーダ部２のCPU１
２をリセツトするものである。 Therefore, in the teletext receiver of this embodiment, a part of the AFT day pulse that is derived from the channel selection circuit 1 of the television receiver 1 for canceling the AFT and applied to the AFT circuit 6 during the channel selection operation is used for teletext transmission. It is also applied to the reset terminal of the CPU 12 of the decoder section 2, so that whenever the channel is switched, the CPU 1 of the teletext decoder section 2 is applied.
2 is reset.
上記のように構成することより、テレビジヨン
受信部１のチヤンネル切換操作を行なうごとに文
字放送デコーダ部２のCPU１２がリセツトされ
るため、これによりデコーダ部２内のバツフアメ
モリ１１等の各メモリがその都度初期状態にな
り、たとえそれまで文字放送の受信状態であつた
場合でも、この受信状態が解除され、速やかに通
常のテレビジヨン放送の受信状態に移行される。
なお、それまでと同一チヤンネルを選局した場合
には、選局回路４からはAFTデイフイートパル
スは出力されないため、文字放送デコーダ部２の
CPU１２はリセツトされずそれまでの文字放送
受信状態が継続される。 With the above configuration, the CPU 12 of the teletext decoder section 2 is reset each time the channel switching operation of the television reception section 1 is performed, so that each memory such as the buffer memory 11 in the decoder section 2 is Each time, the system enters the initial state, and even if it has been in the teletext reception state until then, this reception state is canceled and it immediately shifts to the normal television broadcast reception state.
Note that if you select the same channel as before, the AFT day-to-day pulse will not be output from the channel selection circuit 4, so the teletext decoder section 2 will
The CPU 12 is not reset and continues to receive teletext.
〈効果〉
以上のように本考案の文字放送受信機によれ
ば、選局操作時に受信チヤンネルを切換えるごと
に文字放送デコーダが初期状態にリゼツトされる
ため、たとえそれまで文字放送を受信していた場
合でも速やかに通常のテレビジヨン放送受信画面
に切換えられ、誤動作を生じる惧れはない。<Effects> As described above, according to the teletext receiver of the present invention, the teletext decoder is reset to the initial state each time the reception channel is switched during the channel selection operation, so even if teletext was being received until then, the teletext decoder is reset to the initial state. Even in the event of a problem, the screen can be quickly switched to a normal television broadcast reception screen, and there is no risk of malfunction.
図面は本考案の一実施例のブロツク図である。
１……テレビジヨン受信部、２……文字放送受
信部、４……選局回路、６……AFT回路、７…
…テレビ信号処理回路、９……テレビ／文字信号
切換回路、１０……文字信号処理回路、１２……
CPU。
The drawing is a block diagram of an embodiment of the present invention. 1...Television receiver, 2...Teletext receiver, 4...Tuning selection circuit, 6...AFT circuit, 7...
...TV signal processing circuit, 9...TV/text signal switching circuit, 10...Text signal processing circuit, 12...
CPU.
Claims (1)
ヨン受信部と、このテレビジヨン放送に多重され
ている文字放送を受信する文字放送デコーダ部と
を備えた文字放送受信機において、選局操作時に
テレビジヨン受信部の選局回路から導出される
AFTデイフイートパルスに基いて文字放送デコ
ーダ部を初期状態にリセツトするリセツト手段を
具備したことを特徴とする文字放送受信機。 In a teletext receiver equipped with a television reception unit that receives general television broadcasts and a teletext decoder unit that receives teletext multiplexed with this television broadcast, television reception is performed during channel selection. Derived from the channel selection circuit of
A teletext receiver comprising a reset means for resetting a teletext decoder section to an initial state based on an AFT daily pulse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1694184U JPS60129783U (en) | 1984-02-08 | 1984-02-08 | teletext receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1694184U JPS60129783U (en) | 1984-02-08 | 1984-02-08 | teletext receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60129783U JPS60129783U (en) | 1985-08-30 |
| JPH0246146Y2 true JPH0246146Y2 (en) | 1990-12-05 |
Family
ID=30504182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1694184U Granted JPS60129783U (en) | 1984-02-08 | 1984-02-08 | teletext receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60129783U (en) |
-
1984
- 1984-02-08 JP JP1694184U patent/JPS60129783U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60129783U (en) | 1985-08-30 |
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