JPH02835U - - Google Patents
Info
- Publication number
- JPH02835U JPH02835U JP7764888U JP7764888U JPH02835U JP H02835 U JPH02835 U JP H02835U JP 7764888 U JP7764888 U JP 7764888U JP 7764888 U JP7764888 U JP 7764888U JP H02835 U JPH02835 U JP H02835U
- Authority
- JP
- Japan
- Prior art keywords
- input
- digital
- digital signal
- signal
- input terminal
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来のデジタル信号入力切換え装置を示す回
路図である。
主な図番の説明、２１，２２…デジタル入力端
子、２３，２４……抵抗、２５，２６…入力アン
プ、２７…スイツチ、２９…分圧回路、３２，３
３…ナンドゲート。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing a conventional digital signal input switching device. Explanation of main drawing numbers, 21, 22... Digital input terminal, 23, 24... Resistor, 25, 26... Input amplifier, 27... Switch, 29 ... Voltage divider circuit, 32, 3
3...Nand Gate.
Claims (1)
２デジタル入力端子を備え、該第１あるいは第２
デジタル入力端子に入力されたデジタル信号を選
択するデジタル信号入力切換え装置において、前
記第１デジタル入力端子に入力されたデジタル信
号を受ける第１入力アンプと、前記第２デジタル
入力端子に入力されたデジタル信号を受ける第２
入力アンプと、前記第１デジタル入力端子におけ
る入力インピーダンスを、出力側の装置から出力
されるデジタル信号が伝送される接続ケーブルに
整合させる為の第１抵抗と、前記第２デジタル入
力端子における入力インピーダンスを出力側の装
置から出力されるデジタル信号が伝送される接続
ケーブルに整合させる為の第２抵抗と、前記第２
デジタル入力端子に入力されるデジタル信号を前
記第２入力アンプに伝送する信号路に挿入された
スイツチと、該スイツチを挾んで互いに直列に接
続されていると共に前記第２抵抗にそれぞれ並列
に接続された第３及び第４抵抗から構成され、電
源電圧を分圧する分圧回路と、前記スイツチの一
端に発生する信号レベルに応じて選択的に前記第
１入力アンプから発生された信号を導出する第１
ゲート回路と、前記スイツチの一端に発生する信
号レベルに応じて選択的に前記第２入力アンプか
ら発生された信号を導出する第２ゲート回路とを
備え、前記スイツチの切換え操作に応じて前記第
１あるいは第２ゲート回路を選択的に導出状態に
したことを特徴とするデジタル信号入力切換え装
置。 comprising first and second digital input terminals into which a digital signal is electrically input;
In a digital signal input switching device that selects a digital signal input to a digital input terminal, a first input amplifier receives a digital signal input to the first digital input terminal; and a digital signal input to the second digital input terminal; 2nd receiving signal
an input amplifier; a first resistor for matching the input impedance at the first digital input terminal to a connection cable through which a digital signal output from an output side device is transmitted; and an input impedance at the second digital input terminal. a second resistor for matching the digital signal output from the output side device to the connection cable through which the digital signal is transmitted;
A switch inserted in a signal path for transmitting a digital signal input to the digital input terminal to the second input amplifier; a voltage divider circuit that divides the power supply voltage, and a voltage divider circuit that selectively derives the signal generated from the first input amplifier according to the signal level generated at one end of the switch. 1
a second gate circuit that selectively derives the signal generated from the second input amplifier according to a signal level generated at one end of the switch; 1. A digital signal input switching device characterized in that the first or second gate circuit is selectively brought into a deriving state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7764888U JPH062344Y2 (en) | 1988-06-10 | 1988-06-10 | Digital signal input switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7764888U JPH062344Y2 (en) | 1988-06-10 | 1988-06-10 | Digital signal input switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02835U true JPH02835U (en) | 1990-01-05 |
| JPH062344Y2 JPH062344Y2 (en) | 1994-01-19 |
Family
ID=31302621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7764888U Expired - Lifetime JPH062344Y2 (en) | 1988-06-10 | 1988-06-10 | Digital signal input switching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062344Y2 (en) |
-
1988
- 1988-06-10 JP JP7764888U patent/JPH062344Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH062344Y2 (en) | 1994-01-19 |
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