JPS6257485U - - Google Patents
Info
- Publication number
- JPS6257485U JPS6257485U JP14664485U JP14664485U JPS6257485U JP S6257485 U JPS6257485 U JP S6257485U JP 14664485 U JP14664485 U JP 14664485U JP 14664485 U JP14664485 U JP 14664485U JP S6257485 U JPS6257485 U JP S6257485U
- Authority
- JP
- Japan
- Prior art keywords
- synchronization data
- gate pulse
- synchronization
- counter
- output
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 238000005070 sampling Methods 0.000 claims 2
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Television Systems (AREA)
Description
第１図は本考案にかかる文字放送受信装置の一
実施例を示す回路ブロツク図、第２図は文字放送
の概要を説明する波形図、第３図は本考案の動作
を説明する為の波形図である。
４，１２……カウンタ、７，８……ゲートパル
ス切換回路、９……直列―並列データ変換回路、
１０……サンプルクロツク発生回路、１４……フ
リツプフロツプ回路、１５……制御回路。
Fig. 1 is a circuit block diagram showing an embodiment of the teletext receiving device according to the present invention, Fig. 2 is a waveform diagram illustrating an overview of teletext broadcasting, and Fig. 3 is a waveform diagram explaining the operation of the present invention. It is a diagram. 4, 12... Counter, 7, 8... Gate pulse switching circuit, 9... Series-parallel data conversion circuit,
10...Sample clock generation circuit, 14...Flip-flop circuit, 15...Control circuit.
Claims (1)
形情報の初期に送られるビツト同期もしくはフレ
ーム同期用の同期用データを抜き取り、この同期
用データに位相同期したパルスに基づいて前記文
字図形情報をサンプリングするとともに、このサ
ンプリングにより蓄えたデータの処理を、前記同
期用データの検出に同期して開始する文字放送受
信装置において、 前記テレビジヨン信号に基づく所定基準クロツ
クを水平同期信号でカウントを開始する第１のカ
ウンタと、 このカウンタの出力から前記同期用データを抜
きとるための第１のゲートパルスを発生する第１
のゲートパルス発生回路と、 前記同期用データが検出されたことを示す検出
パルスで前記サンプリング用のパルスのカウント
を開始する第２のカウンタと、 この第２のカウンタの出力から、前記基準クロ
ツクの周期性により予測される前記同期用データ
のゲート位置に対応した第２のゲートパルスを発
生する第２のゲートパルス発生回路と、 前記第１および第２のゲートパルスをそれぞれ
入力し、これら各パルスを選択して同期用データ
の抜取用パルスとして出力する回路であつて、前
記同期用データが検出された後は、第２のゲート
パルスを選択するゲートパルス選択回路とを具備
したことを特徴とする文字放送受信装置。[Claims for Utility Model Registration] Synchronization data for bit synchronization or frame synchronization that is sent at the beginning of character and graphic information that is intermittently superimposed on television signals is extracted, and based on pulses that are phase-synchronized with this synchronization data. In the teletext receiving device, which samples the character and graphic information using a digital signal and starts processing the data stored through this sampling in synchronization with the detection of the synchronization data, the predetermined reference clock based on the television signal is horizontally synchronized. a first counter that starts counting in response to a signal; and a first counter that generates a first gate pulse for extracting the synchronization data from the output of this counter.
a gate pulse generation circuit; a second counter that starts counting the sampling pulses with a detection pulse indicating that the synchronization data has been detected; and an output of the reference clock from the output of the second counter. a second gate pulse generation circuit that generates a second gate pulse corresponding to the gate position of the synchronization data predicted by periodicity; and a gate pulse selection circuit that selects a second gate pulse and outputs it as a pulse for extracting synchronization data, and selects a second gate pulse after the synchronization data is detected. teletext receiving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14664485U JPS6257485U (en) | 1985-09-27 | 1985-09-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14664485U JPS6257485U (en) | 1985-09-27 | 1985-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6257485U true JPS6257485U (en) | 1987-04-09 |
Family
ID=31059302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14664485U Pending JPS6257485U (en) | 1985-09-27 | 1985-09-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6257485U (en) |
-
1985
- 1985-09-27 JP JP14664485U patent/JPS6257485U/ja active Pending
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