JPS6418879U - - Google Patents
Info
- Publication number
- JPS6418879U JPS6418879U JP1987113370U JP11337087U JPS6418879U JP S6418879 U JPS6418879 U JP S6418879U JP 1987113370 U JP1987113370 U JP 1987113370U JP 11337087 U JP11337087 U JP 11337087U JP S6418879 U JPS6418879 U JP S6418879U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- changeover switch
- black
- white
- character
- 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 2
- 230000010355 oscillation Effects 0.000 description 1
Description
第１図は本考案の一実施例のブロツク図、第２
図は文字入力時の動作状態図である。
１……クランプ回路、２……ホワイトクリツプ
回路、３……キヤリア発振回路、４……ＡＭ変調
回路、５……バイアス源、６……映像信号、文字
信号切換スイツチ、７……白黒切換スイツチ、８
……映像入力端子、９……ＲＦ出力端子、１０…
…文字信号入力端子、１１……白黒切換入力端子
、１２……音声変調回路。
Figure 1 is a block diagram of one embodiment of the present invention;
The figure is an operational state diagram when inputting characters. 1... Clamp circuit, 2... White clip circuit, 3... Carrier oscillation circuit, 4... AM modulation circuit, 5... Bias source, 6... Video signal, character signal changeover switch, 7... Black and white changeover switch. , 8
...Video input terminal, 9...RF output terminal, 10...
...Character signal input terminal, 11...Black and white switching input terminal, 12...Audio modulation circuit.
Claims (1)
と、このバイアス電源の最低レベルを入力映像信
号の最低レベルとして直流再生するクランプ回路
と、このクランプ回路の出力信号の過入力を防止
するクリツプ回路と、前記バイアス電源の出力の
うち映像信号の白黒レベルを切換信号により切換
えて文字信号レベルとして出力する白黒切換スイ
ツチと、この白黒切換スイツチからの文字信号と
前記クリツプ回路の出力映像信号とを所定の切換
タイミングで切換えて出力する映像・文字切換ス
イツチと、この映像・文字切換スイツチの出力を
所定高周波信号で変調するＡＭ変調回路とを含む
ことを特徴とする文字表示用ＲＦモジユレータ。 A bias power supply that sets a reference value for each modulation level, a clamp circuit that reproduces direct current using the lowest level of this bias power supply as the lowest level of the input video signal, and a clip circuit that prevents excessive input of the output signal of this clamp circuit. A black and white changeover switch which switches the black and white level of the video signal among the outputs of the bias power supply using a switching signal and outputs it as a character signal level; and a black and white changeover switch which switches between the character signal from the black and white changeover switch and the output video signal of the clip circuit in a predetermined manner. 1. An RF modulator for displaying characters, comprising: a video/character changeover switch that switches and outputs at timing; and an AM modulation circuit that modulates the output of the video/character changeover switch with a predetermined high frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987113370U JPS6418879U (en) | 1987-07-23 | 1987-07-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987113370U JPS6418879U (en) | 1987-07-23 | 1987-07-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6418879U true JPS6418879U (en) | 1989-01-30 |
Family
ID=31353145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987113370U Pending JPS6418879U (en) | 1987-07-23 | 1987-07-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6418879U (en) |
-
1987
- 1987-07-23 JP JP1987113370U patent/JPS6418879U/ja active Pending
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