JPS6366466B2 - - Google Patents
Info
- Publication number
- JPS6366466B2 JPS6366466B2 JP15571481A JP15571481A JPS6366466B2 JP S6366466 B2 JPS6366466 B2 JP S6366466B2 JP 15571481 A JP15571481 A JP 15571481A JP 15571481 A JP15571481 A JP 15571481A JP S6366466 B2 JPS6366466 B2 JP S6366466B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- transformer
- voltage detection
- switch element
- compensation 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 28
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
- H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Description
【発明の詳細な説明】 本発明は通話損失補償回路に関する。[Detailed description of the invention] The present invention relates to a call loss compensation circuit.
加入者からの通話信号を変成器を含む受信回路
から出力する際には、当然に該受信回路の特性に
応じた通話損失が生じるので、この損失を補償す
る必要がある。従来この種の通話損失の補償は、
第１図に示すような構成の通話損失補償回路によ
り行われている。 When a call signal from a subscriber is output from a receiving circuit including a transformer, a call loss occurs depending on the characteristics of the receiving circuit, so it is necessary to compensate for this loss. Traditionally, compensation for this type of call loss is
This is performed by a call loss compensation circuit configured as shown in FIG.
第１図は従来の通話損失補償回路の一例を示す
回路図である。同図において加入者からの通話信
号１はスイツチ素子２（例えばMOSトランジス
タなど非線形特性を有するもの）に入力され、ス
イツチ素子２の出力は抵抗器３を介して変成器５
に入力される。ここで抵抗器３の抵抗値をＲ、ス
イツチ素子２の内部抵抗値をｒとし、両者をほぼ
等しい値すなわちＲ≒ｒとする。なお端子２０に
はスイツチ素子２の所要電源を供給する。抵抗器
３の両端はそれぞれデカツプリングコンデンサ
C0，C1を介して演算増幅器４の−、＋端子に接続
され、演算増幅器４の出力端子はコンデンサC2
を介して変成器５の帰路端に接続される。通話信
号１はスイツチ素子２により前記内部抵抗値ｒ分
の電圧降下を受けるが、上記の回路構成により演
算増幅器４で増幅されてこの降下電圧の約２倍の
電圧が変成器５の前記帰路端に印加される。この
結果、スイツチ素子の内部抵抗による通話損失を
打ち消して補償することができる。 FIG. 1 is a circuit diagram showing an example of a conventional call loss compensation circuit. In the figure, a call signal 1 from a subscriber is input to a switch element 2 (for example, a MOS transistor or other device with nonlinear characteristics), and the output of the switch element 2 is passed through a resistor 3 to a transformer 5.
is input. Here, the resistance value of the resistor 3 is R, and the internal resistance value of the switch element 2 is r, and both values are approximately equal, that is, R≈r. Note that the required power for the switch element 2 is supplied to the terminal 20. Both ends of resistor 3 are decoupled capacitors.
It is connected to the - and + terminals of the operational amplifier 4 via C 0 and C 1 , and the output terminal of the operational amplifier 4 is connected to the capacitor C 2
It is connected to the return end of the transformer 5 via. The call signal 1 is subjected to a voltage drop corresponding to the internal resistance value r by the switch element 2, but with the above circuit configuration, it is amplified by the operational amplifier 4, and a voltage approximately twice this voltage drop is applied to the return terminal of the transformer 5. is applied to As a result, the communication loss due to the internal resistance of the switch element can be canceled out and compensated for.
しかるにこの方法では抵抗器３が線形特性であ
るため、スイツチ素子の前記非線形特性による通
話信号のひずみや変成器による通話損失を補償で
きないという欠点があつた。 However, in this method, since the resistor 3 has a linear characteristic, there is a drawback that it is not possible to compensate for the distortion of the communication signal due to the nonlinear characteristic of the switch element and the communication loss due to the transformer.
本発明の目的はスイツチ素子と同一素子の電圧
検出素子あるいは、該電圧検出素子および変成器
の抵抗分に相当する値の抵抗器を用いることによ
り、上記の欠点を除去した通話損失補償回路を提
供することにある。 An object of the present invention is to provide a call loss compensation circuit that eliminates the above-mentioned drawbacks by using a voltage detection element that is the same element as the switch element, or a resistor with a value corresponding to the resistance of the voltage detection element and the transformer. It's about doing.
本発明によれば、通話信号路を構成するスイツ
チ素子と、該スイツチ素子と同一素子の電圧検出
素子とこの電圧検出素子の両端の電圧を検出して
増幅出力する増幅素子とを含む電圧検出手段と、
変成器とを備え、前記スイツチ素子と直列に接続
された前記電圧検出手段に前記変成器の往路端お
よび帰路端を接続し、かつ前記電圧検出手段の出
力電圧を前記変成器の入力電圧を増加せしめる方
向に前記変成器の帰路端に印加することを特徴と
する通話損失補償回路が得られる。 According to the present invention, voltage detection means includes a switch element constituting a speech signal path, a voltage detection element that is the same element as the switch element, and an amplification element that detects and amplifies the voltage across the voltage detection element. and,
a transformer, an outgoing end and a return end of the transformer are connected to the voltage detecting means connected in series with the switch element, and the output voltage of the voltage detecting means increases the input voltage of the transformer. There is obtained a call loss compensation circuit characterized in that the voltage is applied to the return end of the transformer in the direction of increasing the voltage.
また、本発明によれば、通話信号路を構成する
スイツチ素子と、変成器と、前記スイツチ素子と
同一素子の電圧検出素子と、前記変成器の抵抗分
に相当する抵抗値を有する抵抗器と、前記電圧検
出素子と前記抵抗器との直列接続の両端の電圧を
検出して増幅出力する増幅素子とから成る電圧検
出手段を備え、前記スイツチ素子と直列に接続さ
れた前記電圧検出手段に前記変成器の往路端およ
び帰路端を接続し、かつ前記電圧検出手段の出力
電圧を前記変成器の入力電圧を増加せしめる方向
に前記変成器の帰路端に印加することを特徴とす
る通話損失補償回路が得られる。 Further, according to the present invention, a switch element constituting a communication signal path, a transformer, a voltage detection element that is the same element as the switch element, and a resistor having a resistance value corresponding to the resistance of the transformer. , comprising a voltage detecting means comprising an amplifying element that detects and amplifies the voltage across the series connection of the voltage detecting element and the resistor; A call loss compensation circuit, characterized in that an outgoing end and a return end of a transformer are connected, and the output voltage of the voltage detection means is applied to the return end of the transformer in a direction that increases the input voltage of the transformer. is obtained.
次に図面を参照して本発明について説明する。 Next, the present invention will be explained with reference to the drawings.
第２図は本発明の通話損失補償回路を適用した
電話交換機の一構成例を示すブロツク図である。
同図において１３は通話損失補償回路でスイツチ
素子２と電圧検出手段２′と変成器５を含んで構
成される。加入者回路１１を介した加入者１０か
らの通話信号１はスイツチングネツトワーク１２
内のスイツチ素子２によつてスイツチされ、さら
に電圧検出手段２′によつて通話損失補償が行わ
れた後、トランクインターフエース１４を介して
トランク５へ送り出される。 FIG. 2 is a block diagram showing an example of the configuration of a telephone exchange to which the call loss compensation circuit of the present invention is applied.
In the figure, reference numeral 13 denotes a call loss compensation circuit which includes a switch element 2, a voltage detecting means 2', and a transformer 5. A call signal 1 from a subscriber 10 via a subscriber circuit 11 is transmitted to a switching network 12.
The signal is switched by the switch element 2 in the switch element 2, and after compensation for call loss is performed by the voltage detection means 2', the signal is sent to the trunk 5 via the trunk interface 14.
なお本発明の通話損失補償回路を変成器結合の
加入者とスイツチングネツトワークとの間に変成
器―電圧検出手段―スイツチ素子の順に接続構成
して使用しても同様の通話損失補償を行うことが
できる。 Note that similar call loss compensation can be achieved even when the call loss compensation circuit of the present invention is used in a configuration in which the transformer, voltage detection means, and switch element are connected in this order between a transformer-coupled subscriber and a switching network. be able to.
次に第３図は第２図における通話損失補償回路
の第１の実施例を示す回路図である。同図におい
て電圧検出素子２″はスイツチ素子２と同じ非線
形特性を有する素子（同一素子）である。また同
図において第１図と同一の構成要素にはそれぞれ
同一の符号が付してある。端子２０′には電圧検
出素子２″の所要電源を供給する。スイツチ素子
２は電圧検出素子２″を介して変成器５の往路端
に接続される。従つてスイツチ素子２と電圧検出
素子２″は同一条件で動作する。また電圧検出素
子２″の両端はそれぞれデカツプリングコンデン
サC0，C1を介して演算増幅器４の−、＋端子に接
続され、さらに演算増幅器４の出力端子は残留電
圧阻止用のコンデンサC2を介して変成器５の帰
路端に接続される。 Next, FIG. 3 is a circuit diagram showing a first embodiment of the call loss compensation circuit in FIG. 2. In the figure, the voltage detection element 2'' is an element (same element) having the same nonlinear characteristics as the switch element 2. In addition, in the figure, the same components as in FIG. 1 are given the same reference numerals. The required power for the voltage detection element 2'' is supplied to the terminal 20'. Switch element 2 is connected to the forward end of transformer 5 via voltage detection element 2''. Therefore, switch element 2 and voltage detection element 2'' operate under the same conditions. Further, both ends of the voltage detection element 2'' are connected to the - and + terminals of the operational amplifier 4 via decoupling capacitors C0 and C1 , respectively, and the output terminal of the operational amplifier 4 is connected to a capacitor C2 for blocking residual voltage. It is connected to the return end of the transformer 5 via.
次に本実施例の動作について説明する。加入者
からの通話信号１はスイツチ素子２によつてひず
みを受け、さらに電圧検出素子２″によつて前記
ひずみと同程度のひずみを受ける。一方電圧検出
素子２″の両端の電圧がデカツプリングコンデン
サC0，C1を介して演算増幅器４に供給されると、
演算増幅器４はこれを増幅して前記ひずみの約２
倍（理想的には2.0倍）の電圧を得、この電圧を
コンデンサC2を介して変成器５の入力電圧を増
加せしめる方向に変成器５の帰路端に印加する。
この結果、変成器５の入力電圧はスイツチ素子２
および電圧検出素子２″によるひずみを減少させ、
通話損失の良好な補償を行うことができる。 Next, the operation of this embodiment will be explained. A telephone call signal 1 from a subscriber is subjected to distortion by a switch element 2, and is further subjected to distortion of the same degree by a voltage detection element 2''.On the other hand, the voltage across the voltage detection element 2'' is decoupled. When supplied to the operational amplifier 4 via ring capacitors C 0 and C 1 ,
The operational amplifier 4 amplifies this to approximately 2 of the above distortion.
A voltage doubled (ideally 2.0 times) is obtained and this voltage is applied to the return end of the transformer 5 through the capacitor C 2 in a direction that increases the input voltage of the transformer 5.
As a result, the input voltage of transformer 5 is
and reduce the distortion caused by the voltage detection element 2″,
Good compensation for call loss can be provided.
次に第４図は第２図における通話損失補償回路
の第２の実施例を示す回路図である。本実施例は
前述の第１の実施例の構成に変成器５の抵抗分に
相当する抵抗値rtを有する抵抗器６を追加した構
成となつている。第４図において第３図と同一の
各構成要素にはそれぞれ同一の符号が付してあ
る。本実施例の動作は前述の第１の実施例の動作
に準ずるので説明を省く。本実施例によれば電圧
検出素子２″および抵抗器６の両端の電圧を演算
増幅器４により増幅して電圧検出素子２″による
ひずみの約２倍の電圧および前記抵抗値rtによる
降下電圧の約２倍の電圧を得、この合計電圧を変
成器５の入力電圧を増加せしめる方向に変成器５
の帰路端に印加するので、前述の第１の実施例に
よる効果のほか変成器による電圧降下分まで補償
することができる。 Next, FIG. 4 is a circuit diagram showing a second embodiment of the call loss compensation circuit in FIG. 2. This embodiment has a configuration in which a resistor 6 having a resistance value r t corresponding to the resistance of the transformer 5 is added to the configuration of the first embodiment described above. In FIG. 4, the same components as in FIG. 3 are given the same reference numerals. The operation of this embodiment is similar to the operation of the first embodiment described above, so a description thereof will be omitted. According to this embodiment, the voltage across the voltage detection element 2'' and the resistor 6 is amplified by the operational amplifier 4, and a voltage of approximately twice the distortion caused by the voltage detection element 2'' is obtained, and the voltage drop due to the resistance value r t is reduced. The voltage is approximately doubled, and this total voltage is applied to the transformer 5 in a direction that increases the input voltage of the transformer 5.
Since the voltage is applied to the return end of the transformer, it is possible to compensate for the voltage drop caused by the transformer in addition to the effects of the first embodiment described above.
上記各実施例は本発明を制限するものではな
い。すなわちスイツチ素子（電圧検出素子）とし
てMOSトランジスタを示したが非線形特性を有
するものであれば他の種類の素子でもよい。また
直流阻止用のデカツプリングコンデンサや残留電
圧阻止用のコンデンサを示したが、これらは演算
増幅器内に含めてもよいし、あるいは原理的には
省いても動作上支障とはならない。 The above embodiments do not limit the present invention. That is, although a MOS transistor is shown as a switch element (voltage detection element), other types of elements may be used as long as they have nonlinear characteristics. Furthermore, although a decoupling capacitor for DC blocking and a capacitor for blocking residual voltage have been shown, these may be included in the operational amplifier, or may be omitted in principle without causing any operational problems.
以上の説明により明らかなように、本発明の通
話損失補償回路によれば非線形特性を有するスイ
ツチ素子による通話信号のひずみを補償すること
ができ、また上記の通話信号のひずみの補償のほ
か変成器による通話損失をも補償できるという大
きな効果が生じる。 As is clear from the above explanation, according to the call loss compensation circuit of the present invention, it is possible to compensate for the distortion of the call signal caused by the switch element having nonlinear characteristics. This has the great effect of compensating for call losses due to
第１図は従来の通話損失補償回路の一例を示す
回路図、第２図は本発明の通話損失補償回路を適
用した電話交換機の一構成例を示すブロツク図、
第３図および第４図はそれぞれ第２図における通
話損失補償回路の第１および第２の実施例を示す
回路図である。
１……通話信号、２……スイツチ素子、２′…
…電圧検出手段、２″……電圧検出素子、３……
抵抗器、４……演算増幅器、５……変成器、６…
…抵抗器、１０……加入者、１１……加入者回
路、１２……スイツチングネツトワーク、１３…
…通話損失補償回路、１４……トランクインタフ
エース、１５……トランク、２０，２０′……端
子。
FIG. 1 is a circuit diagram showing an example of a conventional call loss compensation circuit, and FIG. 2 is a block diagram showing an example of the configuration of a telephone exchange to which the call loss compensation circuit of the present invention is applied.
3 and 4 are circuit diagrams showing first and second embodiments of the call loss compensation circuit in FIG. 2, respectively. 1... Call signal, 2... Switch element, 2'...
...Voltage detection means, 2''...Voltage detection element, 3...
Resistor, 4... operational amplifier, 5... transformer, 6...
...Resistor, 10...Subscriber, 11...Subscriber circuit, 12...Switching network, 13...
... Call loss compensation circuit, 14 ... Trunk interface, 15 ... Trunk, 20, 20' ... Terminal.
Claims (1)
スイツチ素子と同一素子の電圧検出素子とこの電
圧検出素子の両端の電圧を検出して増幅出力する
増幅素子とを含む電圧検出手段と、変成器とを備
え、前記スイツチ素子と直列に接続された前記電
圧検出手段に前記変成器の往路端および帰路端を
接続し、かつ前記電圧検出手段の出力電圧を前記
変成器の入力電圧を増加せしめる方向に前記変成
器の帰路端に印加することを特徴とする通話損失
補償回路。 ２ 特許請求の範囲第１項記載の通話損失補償回
路において、前記電圧検出手段は前記電圧検出素
子と、前記変成器の抵抗分に相当する抵抗値を有
する抵抗器と、前記電圧検出素子と前記抵抗器と
の直列接続の両端の電圧を検出して増幅出力する
増幅素子とから成ることを特徴とする通話損失補
償回路。[Claims] 1. A voltage detection device that includes a switch element constituting a speech signal path, a voltage detection element that is the same as the switch element, and an amplification element that detects and amplifies the voltage across the voltage detection element. and a transformer, an outgoing end and a return end of the transformer are connected to the voltage detecting means connected in series with the switch element, and the output voltage of the voltage detecting means is input to the transformer. A call loss compensation circuit characterized in that a voltage is applied to a return end of the transformer in a direction that increases voltage. 2. In the call loss compensation circuit according to claim 1, the voltage detection means includes the voltage detection element, a resistor having a resistance value corresponding to the resistance of the transformer, and the voltage detection element and the A call loss compensation circuit characterized by comprising an amplifying element that detects a voltage across a resistor in series and amplifies and outputs the detected voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15571481A JPS5857849A (en) | 1981-09-30 | 1981-09-30 | Transmission loss compensating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15571481A JPS5857849A (en) | 1981-09-30 | 1981-09-30 | Transmission loss compensating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5857849A JPS5857849A (en) | 1983-04-06 |
| JPS6366466B2 true JPS6366466B2 (en) | 1988-12-20 |
Family
ID=15611884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15571481A Granted JPS5857849A (en) | 1981-09-30 | 1981-09-30 | Transmission loss compensating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5857849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63129454U (en) * | 1987-02-18 | 1988-08-24 |
-
1981
- 1981-09-30 JP JP15571481A patent/JPS5857849A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63129454U (en) * | 1987-02-18 | 1988-08-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5857849A (en) | 1983-04-06 |
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