JPH0279679U - - Google Patents
Info
- Publication number
- JPH0279679U JPH0279679U JP15919088U JP15919088U JPH0279679U JP H0279679 U JPH0279679 U JP H0279679U JP 15919088 U JP15919088 U JP 15919088U JP 15919088 U JP15919088 U JP 15919088U JP H0279679 U JPH0279679 U JP H0279679U
- Authority
- JP
- Japan
- Prior art keywords
- horizontal pulse
- horizontal
- generation circuit
- frequency
- switching means
- 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
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Television Systems (AREA)
Description
第１図及び第２図は本考案になる文字放送受信
装置の各実施例を示すブロツク図、第３図は第２
図の回路中の各部の信号波形を示す図、第４図は
従来の文字放送受信装置（文字放送デコーダ）の
一例の構成を示すブロツク図、第５図は第４図の
回路中の各部の信号波形を示す図である。
２１……入力端子、２２……同期分離回路、２
３……ハーフＨパルスキラー回路、２４……ＡＦ
Ｃ回路、２５……スイツチ回路、２６……ＢＰＦ
、２７……バーストゲートパルス発生回路、２８
……バーストゲート回路、２９，３５……位相比
較回路、３０……４５５逓倍回路、３１……２分
周回路、３２，３８……検波回路、３３，３６…
…ＬＰＦ、３４……シユミツトトリガ回路、３７
……水平発振回路、３９……波形整形回路、４０
……モノマルチバイブレータ（モノマルチ）。
1 and 2 are block diagrams showing each embodiment of the teletext receiving device according to the present invention, and FIG.
Figure 4 is a block diagram showing the configuration of an example of a conventional teletext receiving device (texttext decoder), and Figure 5 is a diagram showing the signal waveforms of each part in the circuit shown in Figure 4. FIG. 3 is a diagram showing signal waveforms. 21...Input terminal, 22...Synchronization separation circuit, 2
3...Half H pulse killer circuit, 24...AF
C circuit, 25... switch circuit, 26... BPF
, 27...burst gate pulse generation circuit, 28
... Burst gate circuit, 29, 35 ... Phase comparator circuit, 30 ... 455 multiplier circuit, 31 ... 2 frequency divider circuit, 32, 38 ... Detection circuit, 33, 36 ...
...LPF, 34...Schmitt trigger circuit, 37
... Horizontal oscillation circuit, 39 ... Waveform shaping circuit, 40
...Mono multi vibrator (Mono multi).
Claims (1)
字信号を受信し、この受信した文字信号を復号す
る文字放送受信装置において、 受信した文字信号を復号する際の水平走査期間
内での位置を示すゲートパルスを作成するための
時間基準となる水平パルスを生成する水平パルス
生成回路と、 この水平パルス生成回路で生成された水平パル
スの周波数変動を自動的に補正制御する自動周波
数制御回路と、 前記自動周波数制御回路から供給される周波数
変動補正された水平パルスと前記水平パルス生成
回路から供給される周波数変動補正されない水平
パルスとを切換えて出力する切換手段とを備え、 入力される映像信号が連続している場合に、前
記切換手段を周波数変動補正された水平パルスが
出力されるように切換え、入力される映像信号に
比較的大きな時間飛びを含む場合に、前記切換手
段を周波数変動補正されない水平パルスが出力さ
れるように切換えてなることを特徴とする文字放
送受信装置。[Scope of claim for utility model registration] In a teletext receiving device that receives a character signal superimposed within the vertical blanking period of a video signal and decodes the received character signal, A horizontal pulse generation circuit that generates a horizontal pulse that is the time reference for creating a gate pulse that indicates the position within the horizontal scanning period, and a horizontal pulse generation circuit that automatically corrects frequency fluctuations of the horizontal pulse generated by this horizontal pulse generation circuit. an automatic frequency control circuit for controlling, and a switching means for switching and outputting a horizontal pulse with frequency fluctuations corrected supplied from the automatic frequency control circuit and a horizontal pulse without frequency fluctuations supplied from the horizontal pulse generation circuit. If the input video signal is continuous, the switching means is switched to output a horizontal pulse corrected for frequency fluctuation, and if the input video signal includes a relatively large time jump, A teletext receiving apparatus characterized in that the switching means is switched so that a horizontal pulse without frequency fluctuation correction is output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15919088U JPH0279679U (en) | 1988-12-07 | 1988-12-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15919088U JPH0279679U (en) | 1988-12-07 | 1988-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0279679U true JPH0279679U (en) | 1990-06-19 |
Family
ID=31440181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15919088U Pending JPH0279679U (en) | 1988-12-07 | 1988-12-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0279679U (en) |
-
1988
- 1988-12-07 JP JP15919088U patent/JPH0279679U/ja active Pending
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