JPS6213087U - - Google Patents
Info
- Publication number
- JPS6213087U JPS6213087U JP10327185U JP10327185U JPS6213087U JP S6213087 U JPS6213087 U JP S6213087U JP 10327185 U JP10327185 U JP 10327185U JP 10327185 U JP10327185 U JP 10327185U JP S6213087 U JPS6213087 U JP S6213087U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- character
- character signal
- sampling clock
- teletext receiver
- 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
- 238000005070 sampling Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009432 framing Methods 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Television Systems (AREA)
Description
第１図は本考案の文字放送受信機の１実施例の
ブロツク図、第２図から第４図は第１図の実施例
における文字信号とサンプリングブロツクのタイ
ミングチヤートであり、第２図は文字信号とサン
プリングブロツクの位相が合つている場合、第３
図はサンブリングブロツクの位相が進んでいる場
合、第４図はサンプリングの位相が遅れている場
合のタイミングチヤート、第５図は第２〜４図に
示すそれぞれの場合における判別信号の状態を示
す判別信号比較図である。
１……アンテナ、２……チユーナ、３……映像
検波回路、４……映像信号処理回路、５……ＡＦ
Ｔ回路、６……文字信号検出回路、７……サンプ
リングクロツク発生回路、８……文字信号処理回
路、９……ＲＧＢ出力切換回路、１０……ＣＲＴ
、１１……フレーミングコード検出回路、１２…
…位相比較回路、１３……切換回路、１４……選
局電圧発生回路、１５，１８……文字信号、１６
，１９……サンプリングクロツク、１７，２０…
…サンプリング後の文字信号、２１，２２，２３
……判別信号。
FIG. 1 is a block diagram of one embodiment of the teletext receiver of the present invention, FIGS. 2 to 4 are timing charts of character signals and sampling blocks in the embodiment of FIG. 1, and FIG. If the signal and sampling block are in phase, the third
The figure shows a timing chart when the sampling block is ahead in phase, Figure 4 is a timing chart when the sampling phase is behind, and Figure 5 shows the state of the discrimination signal in each case shown in Figures 2 to 4. It is a discrimination signal comparison diagram. 1...Antenna, 2...Tuner, 3...Video detection circuit, 4...Video signal processing circuit, 5...AF
T circuit, 6...Character signal detection circuit, 7...Sampling clock generation circuit, 8...Character signal processing circuit, 9...RGB output switching circuit, 10...CRT
, 11... framing code detection circuit, 12...
...Phase comparison circuit, 13...Switching circuit, 14...Tuning selection voltage generation circuit, 15, 18...Character signal, 16
, 19...sampling clock, 17, 20...
...Character signal after sampling, 21, 22, 23
...discrimination signal.
Claims (1)
字や図形などの情報が重畳されて送られて来る文
字信号を受信し表示する文字放送受信機において
、テレビジヨン信号の中から文字信号のみを取り
出す手段と、文字信号データに先立つて伝送され
るクロツクライン信号に同期したサンプリングク
ロツクを発生する手段と、前記文字信号データと
前記サンプリングクロツクとの位相比較を行い最
適受信状態を判別する手段と、この判別信号によ
り受信周波数を自動的に微調し得る手段とを具備
したことを特徴とする文字放送受信機。 In a teletext receiver that receives and displays a character signal sent with information such as characters and graphics superimposed during the vertical planking period of the television signal, means for extracting only the character signal from the television signal; means for generating a sampling clock synchronized with a clock line signal transmitted prior to character signal data; means for comparing the phases of said character signal data and said sampling clock to determine the optimum reception condition; 1. A teletext receiver comprising means for automatically finely adjusting a receiving frequency according to a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10327185U JPS6213087U (en) | 1985-07-05 | 1985-07-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10327185U JPS6213087U (en) | 1985-07-05 | 1985-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6213087U true JPS6213087U (en) | 1987-01-26 |
Family
ID=30975673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10327185U Pending JPS6213087U (en) | 1985-07-05 | 1985-07-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6213087U (en) |
-
1985
- 1985-07-05 JP JP10327185U patent/JPS6213087U/ja active Pending
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