JPS59208972A - 4-wire telephone set - Google Patents
4-wire telephone setInfo
- Publication number
- JPS59208972A JPS59208972A JP8305783A JP8305783A JPS59208972A JP S59208972 A JPS59208972 A JP S59208972A JP 8305783 A JP8305783 A JP 8305783A JP 8305783 A JP8305783 A JP 8305783A JP S59208972 A JPS59208972 A JP S59208972A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- converter
- switching circuit
- circuit
- telephone set
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M13/00—Party-line systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はディジタル信号をインターフェースとする4線
式電話機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-wire telephone that uses digital signals as an interface.
従来この種の4線式電話機は第1図の様に構成されてい
る。即ち、入力端子1に入力されたディジタル信号はD
/Aコンバータ5によってアナログ信号に変換され内部
回路3を経た後A、 / Dコンバータ6で再びディジ
タル信号に変換されて出刃端子2から次段の4線式電話
機に送出される。Conventionally, this type of four-wire telephone has been constructed as shown in FIG. That is, the digital signal input to input terminal 1 is D
The signal is converted into an analog signal by the A/A converter 5, passes through the internal circuit 3, is converted back to a digital signal by the A/D converter 6, and is sent from the output terminal 2 to the next four-wire telephone.
第2図の様に上述の4線式電話機10,11゜12は通
常多段接続されて(資)用される。この様な回線では、
各々の4線式電話機のD/Aコンバータ、A/Dコンバ
ータが多段接続される事となるため回線の品質を保つに
は、4線式電話機の段数が制限される事となる。As shown in FIG. 2, the above-mentioned four-wire telephones 10, 11 and 12 are usually connected in multiple stages. In a line like this,
Since the D/A converter and A/D converter of each 4-wire telephone are connected in multiple stages, the number of stages of the 4-wire telephone is limited in order to maintain line quality.
本発明の目的は、上述の従来の欠点を解決し、多段にわ
たって4線式電話機が回線に挿入されても劣化のない情
報を伝える事の出来る4線式電話機を提供する事にある
。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks and to provide a four-wire telephone that can transmit information without deterioration even if four-wire telephones are inserted into a line in multiple stages.
本発明の4線式電話機は、人力された第一および第二の
ディジクル信号をそれぞれアナログ信号に変喚する第一
および第二のI) / Aコンバータと、七のそれぞれ
の出刃を入力する内部回路と、このそれぞれの人力に対
応する出力音それぞれディジタル信号に変喚する第一お
よび第二のA/Dコンバータとを有する4線式電話機に
おいて、前記第一のD/Aコンバータの人力および前記
第一のA/Dコンバータの出力を切替えて出刃する第一
の切替回路と、前記第二のD/Aコンバータの人力およ
び前記第二のA/Dコンバータの出力を切替えて出力す
る第二の切替回路とを有するCとを特徴とする。The four-wire telephone of the present invention includes first and second I/A converters for converting manually input first and second digital signals into analog signals, respectively, and an internal circuit for inputting seven digital signals. a circuit, and first and second A/D converters that convert output sounds corresponding to the respective human power into digital signals, wherein the first D/A converter's human power and the A first switching circuit that switches the output of the first A/D converter and outputs the blade, and a second switching circuit that switches and outputs the manual power of the second D/A converter and the output of the second A/D converter. C having a switching circuit.
次に本発明について図面を参照して詳細に説明する。Next, the present invention will be explained in detail with reference to the drawings.
第3図は本発明の一実焔例を示す回路図である。FIG. 3 is a circuit diagram showing an example of the present invention.
本実殉例においては出刃端子2への信号が、大力信号と
A / I)コンバータ6の出力信号のどちらにも切替
えられる接点を有する。本4線式電話機において電話信
号を通過させるだけに使用する時は、切替回路4の接点
をa側に接続する事により1出力端子2には人力信号上
のものが送出される事となる。この蒔においても本機の
受信回路は動作しているため、電話信号の受信は従来通
り行なえる。In this actual example, the signal to the blade terminal 2 has a contact point that can be switched to either a large power signal or an output signal of the A/I converter 6. When this 4-wire telephone is used only to pass telephone signals, by connecting the contact of the switching circuit 4 to the a side, a human input signal is sent to the 1 output terminal 2. Even in this case, the receiving circuit of this device is still operating, so it is possible to receive telephone signals as before.
次に本4線式電話機から信号を送る場合には、切替回路
4の接点をb側に接続する事で従来と同じ回路構成とな
り、送信信号は内部回路3からA/Dコンバータ6を経
由の後接点すを介して出刃端子2から次段の4線式電話
機に送出される。即ち、切替回路4の接点の接続法によ
り出力信号が人力信号か電話機内の回路を経由した信号
かのどちらかに切替えられる事となる。Next, when sending a signal from this 4-wire telephone, by connecting the contact of the switching circuit 4 to the b side, the circuit configuration is the same as before, and the transmission signal is sent from the internal circuit 3 via the A/D converter 6. The signal is sent from the output terminal 2 to the next four-wire telephone via the rear contact point. That is, depending on the connection method of the contacts of the switching circuit 4, the output signal can be switched to either a human input signal or a signal via the circuit inside the telephone.
第4図に本線式電話機を多段接続した例を示1−8本図
では、4線式電話機21.23は送受信を行ない、4線
式電話機22については受信時のみ動作させ電話機23
への送出は電話機21の信号を七のまま通過させる様に
各々の4線式電話機の切替回路を操作した場合を示す。Figure 4 shows an example in which main line telephones are connected in multiple stages.1-8 In this figure, the 4-wire telephones 21 and 23 perform transmission and reception, and the 4-wire telephone 22 operates only when receiving data.
In this case, the switching circuit of each 4-wire telephone is operated so that the signal from the telephone 21 is passed through as is.
電話機22で受信した際には、出刃信号の接続を切替え
る事により、電話機21.23と同様に送受信する事が
出来る。When the telephone 22 receives the signal, it can be transmitted and received in the same way as the telephones 21 and 23 by switching the connection of the Deba signal.
以上の説明で明らかな様に、本発明の出刃信号切替回路
を有する4線式電話機を用いたならば4線式電話機の多
段接続の際の電話信号の品質劣化により生ずる段数制限
は規定されないものとなる。As is clear from the above explanation, if a 4-wire telephone having the Deba signal switching circuit of the present invention is used, there is no restriction on the number of stages caused by deterioration in the quality of telephone signals when 4-wire telephones are connected in multiple stages. becomes.
本発明には、ディジタル回線における4線式電話機内の
回路で左右される電話機多段接続時の段数制限全なくす
と共に電話機挿入による信号の劣化をもなくすという効
果がある。The present invention has the effect of completely eliminating the limit on the number of stages when connecting telephones in multiple stages, which is affected by the circuitry within the four-wire telephone in a digital line, and also eliminating signal deterioration due to the insertion of telephones.
第1図は従来の4勝式電話機のブロック図、第2図は第
1図の電話機の多段接続の場合を示す接続図、第3図は
本発明の一実権例を示すブロック図、第4図は第3図の
4線式電話機を多段接続した場合の一例を示す接続図で
ある。
1・・・・・・人力端子、2・・団・出力端子、3・川
・・内部回路、4・・・・・・切替回路、5・・・・・
・D/Aコンバータ、6−−−−−−A/Dコンパ−p
、10,11,12゜21、 22. 23・・・・・
・4R式電話機。
、′・、〜・八
代理人 9P理士 内 原 波 =””、、!’
、’に/Fig. 1 is a block diagram of a conventional 4-way telephone; Fig. 2 is a connection diagram showing a multi-stage connection of the telephone shown in Fig. 1; Fig. 3 is a block diagram showing an example of the present invention; The figure is a connection diagram showing an example of a case where the four-wire telephone set of FIG. 3 is connected in multiple stages. 1...Manual terminal, 2...Group output terminal, 3...Internal circuit, 4...Switching circuit, 5...
・D/A converter, 6------A/D converter p
, 10, 11, 12°21, 22. 23...
・4R type telephone. ,′・,〜・8 Agent 9P Physician Uchihara Wave =””,,! '
, 'ni/
Claims (1)
アナログ信号に変換する第一および第二のD/Aコンバ
ータと、そのそれぞれの出刃を人力する内部回路と、こ
のそれぞれの大力に対応する出刃をそれぞれディジタル
信号に変換する第一および第二のA/Dコンバータとを
有する4線式電話機において、前記第一のD/Aコンバ
ータノ人力および前記第一のA/I)コンバータの出力
を切替えて出力する第一の切替回路と、前記第二のD/
Aコンバータの入力および前記第二ノA/Dコンバータ
の出力を切替えて出力する第二の切替回路とを有するこ
とを特徴とする4線式電話機。First and second D/A converters that convert input first and second digital signals into analog signals, internal circuits that manually generate the blades, and blades that correspond to the respective large forces. In a four-wire telephone having first and second A/D converters each converting into a digital signal, the output of the first D/A converter and the first A/I converter is switched. a first switching circuit that outputs, and the second D/
A four-wire telephone set, comprising: a second switching circuit that switches and outputs the input of the A converter and the output of the second A/D converter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8305783A JPS59208972A (en) | 1983-05-12 | 1983-05-12 | 4-wire telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8305783A JPS59208972A (en) | 1983-05-12 | 1983-05-12 | 4-wire telephone set |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59208972A true JPS59208972A (en) | 1984-11-27 |
Family
ID=13791559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8305783A Pending JPS59208972A (en) | 1983-05-12 | 1983-05-12 | 4-wire telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59208972A (en) |
-
1983
- 1983-05-12 JP JP8305783A patent/JPS59208972A/en active Pending
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