JPS6249378U - - Google Patents
Info
- Publication number
- JPS6249378U JPS6249378U JP14076185U JP14076185U JPS6249378U JP S6249378 U JPS6249378 U JP S6249378U JP 14076185 U JP14076185 U JP 14076185U JP 14076185 U JP14076185 U JP 14076185U JP S6249378 U JPS6249378 U JP S6249378U
- Authority
- JP
- Japan
- Prior art keywords
- channel
- modulator
- parallel
- carrier wave
- output signal
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Television Signal Processing For Recording (AREA)
Description
第１図は本考案にかかるＲＦモジユレータの一
実施例を示す回路図、第２図は本考案に関連する
ＲＦモジユレータの基本構成を示すブロツク図、
第３図は従来のＲＦモジユレータの一例を示す回
路図である。
１１…変調回路、１４，１６，１８〜２０，２
８，３７，３８…抵抗、１５，２１，３１，３３
…コンデンサ、３２，３４，３５…コイル、３６
…切換スイツチ。
FIG. 1 is a circuit diagram showing an embodiment of the RF modulator according to the present invention, and FIG. 2 is a block diagram showing the basic configuration of the RF modulator related to the present invention.
FIG. 3 is a circuit diagram showing an example of a conventional RF modulator. 11...Modulation circuit, 14, 16, 18-20, 2
8, 37, 38...Resistance, 15, 21, 31, 33
...Capacitor, 32, 34, 35...Coil, 36
...Switch.
Claims (1)
なる搬送波を発生可能とし、選択切換スイツチの
切換操作に基いていずれか一方のチヤンネルの搬
送波を出力する搬送波発生回路と、 上記搬送波発生回路からの選択されたチヤンネ
ルの搬送波を映像信号で変調して映像変調出力信
号を出力する第１の変調器、および上記選択され
たチヤンネルの搬送波をＦＭ変調された音声信号
で変調してその選択されたチヤンネルの搬送波を
中心とした両側波帯成分を含む音声変調出力信号
を出力する第２の変調器を有して成る変調回路と
、 前記第２の変調器の出力から下側波帯成分を除
去した信号と、前記第１の変調器からの出力信号
とを混合して出力するため、上記両信号の混合点
と前記第２の変調器の出力端との間に配置した第
１のインダクタンスとコンデンサにて成るＬＣ並
列共振回路、および前記選択切換スイツチの切換
操作によつてこのＬＣ並列共振回路に並列に選択
接続される第２のインダクタンスとを含んで成る
回路とを具備し、 前記第２の変調器の出力信号から、第１チヤン
ネル選択時には前記第１のインダクタンスとコン
デンサとによる並列回路にて第１チヤンネルでの
下側波帯成分を除去し、第２チヤンネル選択時に
は前記第１と第２のインダクタンスおよびコンデ
ンサによる並列回路にて第２チヤンネルでの下側
波帯成分を除去するよう、上記各並列回路の共振
周波数を設定したことを特徴とするＲＦモジユレ
ータ。[Claims for Utility Model Registration] A carrier wave generation circuit capable of generating different carrier waves in a first channel and a second channel, and outputting a carrier wave of either channel based on a switching operation of a selection switch; a first modulator that modulates the carrier wave of the selected channel from the generation circuit with a video signal and outputs a video modulated output signal; a modulation circuit comprising a second modulator that outputs an audio modulated output signal containing both sideband components centered on a carrier wave of a selected channel; In order to mix and output the signal from which the component has been removed and the output signal from the first modulator, a first an LC parallel resonant circuit comprising an inductance and a capacitor, and a second inductance selectively connected in parallel to the LC parallel resonant circuit by switching the selection switch, From the output signal of the second modulator, when the first channel is selected, the lower sideband component of the first channel is removed by a parallel circuit consisting of the first inductance and the capacitor, and when the second channel is selected, the lower sideband component of the first channel is removed. An RF modulator characterized in that the resonance frequency of each of the parallel circuits is set so that the lower sideband component in the second channel is removed in the parallel circuit including the first and second inductances and capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14076185U JPS6249378U (en) | 1985-09-17 | 1985-09-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14076185U JPS6249378U (en) | 1985-09-17 | 1985-09-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6249378U true JPS6249378U (en) | 1987-03-26 |
Family
ID=31047916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14076185U Pending JPS6249378U (en) | 1985-09-17 | 1985-09-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6249378U (en) |
-
1985
- 1985-09-17 JP JP14076185U patent/JPS6249378U/ja active Pending
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