JPH0439746U - - Google Patents
Info
- Publication number
- JPH0439746U JPH0439746U JP8118690U JP8118690U JPH0439746U JP H0439746 U JPH0439746 U JP H0439746U JP 8118690 U JP8118690 U JP 8118690U JP 8118690 U JP8118690 U JP 8118690U JP H0439746 U JPH0439746 U JP H0439746U
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- series
- frequency
- tuner section
- modulation circuit
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は本考案によるＦＭ周波数変換装置の一
実施例を示す回路図、第２図は従来のＦＭ周波数
変換装置の一例を示す回路図である。
１０……ＦＭ周波数変換装置、１１……外部入
力端子、１２……周波数変調回路、１３……アン
テナ端子、１４……外部出力端子、１５……スイ
ツチ回路、１６……切換え端子、２１ａ，２１ｂ
，２１ｃ，２１ｄ……ローパスフイルター、２２
ａ，２２ｂ，２２ｃ，２３……スイツチングトラ
ンジスタ。
FIG. 1 is a circuit diagram showing an embodiment of an FM frequency conversion device according to the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional FM frequency conversion device. 10...FM frequency conversion device, 11...External input terminal, 12...Frequency modulation circuit, 13...Antenna terminal, 14...External output terminal, 15...Switch circuit, 16...Switching terminal, 21a, 21b
, 21c, 21d...Low pass filter, 22
a, 22b, 22c, 23... switching transistors.
Claims (1)
数変換させる周波数変調回路と、アンテナとチユ
ーナー部との間に直列に接続され且つ、該周波数
変調回路とアンテナとを選択的に該チユーナー部
に接続せしめるスイツチ回路とを含んでいるＦＭ
周波数変換装置において、 該スイツチ回路が、該アンテナに接続されるべ
きアンテナ端子とチユーナー部に接続されるべき
外部出力端子との間に直列に接続された複数のロ
ーパスフイルターと、各ローパスフイルターの間
とアース間に接続された第一のスイツチング素子
と、周波数変調回路の出力側と該外部出力端子と
の間に直列に接続された第二のスイツチング素子
とを含んでいることを特徴とするＦＭ周波数変換
装置。[Claims for Utility Model Registration] A frequency modulation circuit that converts a line signal input from an external device into an FM frequency, and is connected in series between an antenna and a tuner section, and selectively connects the frequency modulation circuit and the antenna. and a switch circuit connected to the tuner section.
In the frequency conversion device, the switch circuit connects a plurality of low-pass filters connected in series between an antenna terminal to be connected to the antenna and an external output terminal to be connected to a tuner section, and between each low-pass filter. and a second switching element connected in series between the output side of the frequency modulation circuit and the external output terminal. Frequency conversion device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8118690U JPH0439746U (en) | 1990-07-31 | 1990-07-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8118690U JPH0439746U (en) | 1990-07-31 | 1990-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0439746U true JPH0439746U (en) | 1992-04-03 |
Family
ID=31626900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8118690U Pending JPH0439746U (en) | 1990-07-31 | 1990-07-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0439746U (en) |
-
1990
- 1990-07-31 JP JP8118690U patent/JPH0439746U/ja active Pending
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