JPS59132248A - Method for improving echo loss characteristic of hybrid coil - Google Patents
Method for improving echo loss characteristic of hybrid coilInfo
- Publication number
- JPS59132248A JPS59132248A JP690583A JP690583A JPS59132248A JP S59132248 A JPS59132248 A JP S59132248A JP 690583 A JP690583 A JP 690583A JP 690583 A JP690583 A JP 690583A JP S59132248 A JPS59132248 A JP S59132248A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- hybrid coil
- terminal equipment
- impedance
- loss characteristic
- 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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/581—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a transformer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は２線式伝送路と端局装置の４線式回路とを結合
するハイブリッドコイルのミスマツチングによって生じ
る反響損失特性を改善する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving reverberation loss characteristics caused by mismatching of a hybrid coil that couples a two-wire transmission line and a four-wire circuit of an end station.
従来、遠方監視制御装置などに使用する伝送路としては
通信すべき装置との距離が比較的短かいので回線損失が
小さく、高速伝送をも必妥としないことから、コスト的
に有利な２線式伝送線路を用い１周波数多重伝送方式を
適用する場合が多い。Traditionally, 2-wire transmission lines used for remote monitoring and control equipment have been cost-effective because the distance to the device to be communicated with is relatively short, line loss is low, and high-speed transmission is not a necessity. In many cases, a single frequency multiplexing transmission system is applied using a transmission line of the same type.
第１図は遠方監視制御装置の構成図で、ノ・イブリント
コイルＨは２線式伝送路／を２線式送信部λと２線式受
信部とに結合している。信号処理回路２からの送信信号
は伝送回銘３で変調器Ｖによって変調され、帯域ろ波器
、Ｓｆ通シ、アッテネータｊａによってレベル調整され
、ノ１イブリッドコイルＨを介し、レベル調整用アッテ
ネータｔｂと中継線路ｔとを通って伝送路／に送出され
る。また伝送路／から到来する信号は伝送回路３におけ
る中継線輪６．レベル調整用アッテネータＳｂ、ハイブ
リッドコイルＨ，アッテネータ５Ｃおよび帯域ろ波器７
を介し、復調器ざによって復調され。FIG. 1 is a block diagram of a remote monitoring and control device, in which a no-event coil H couples a two-wire transmission line to a two-wire transmitter λ and a two-wire receiver. The transmission signal from the signal processing circuit 2 is modulated by a modulator V in a transmission cycle 3, and its level is adjusted by a bandpass filter, an Sf filter, and an attenuator ja. and the relay line t, and are sent to the transmission line /. In addition, signals arriving from the transmission line 6 are relayed to the relay ring 6 in the transmission circuit 3. Level adjustment attenuator Sb, hybrid coil H, attenuator 5C, and bandpass filter 7
is demodulated by a demodulator.
信号処理回路２に受信信号を取シ出している。ノ・イブ
リッドコイル■は同図に示したＡ→Ｂ、Ｂ−Ａ方向の信
号だけに大きい減衰特性すなわち反響損れて受信部入力
点でのｓ／Ｎ向上を図っている。A received signal is output to a signal processing circuit 2. The hybrid coil (2) has a large attenuation characteristic, that is, echo loss, only for signals in the A→B and B-A directions shown in the figure, and is intended to improve the S/N at the input point of the receiver.
通常、伝送路／は専用線だけでなく電々公社回線を借用
する場合もあシ、この場合には端末装置の特性インピー
ダンスが６００Ωに規定されている。しかし、伝送路の
特性インピーダンスが８０００であることは希で、端末
装置と伝送路との間でインピーダンス・ミスマツチング
を起こす。このために、ハイブリッドコイルＨの反響損
失特性が悪化する。Normally, the transmission line is not only a dedicated line but also a public corporation line, in which case the characteristic impedance of the terminal device is specified to be 600Ω. However, the characteristic impedance of the transmission line is rarely 8000, which causes impedance mismatching between the terminal device and the transmission line. For this reason, the reverberation loss characteristics of the hybrid coil H deteriorate.
本発明は上記問題点の解決のためになされたもので、端
局装置の４ｉ１１１式伝送回路ｔ２ｉ式伝送路に結合す
るノ１イブリッドコイルの反響損失特性の改善方法の提
供を目的とする。The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for improving the reverberation loss characteristics of a No. 1 hybrid coil coupled to a 4i111 type transmission circuit and a t2i type transmission line of a terminal equipment.
以下に本発明の実施例を図面を参照して説明する。第２
図は本発明の第１実施例の回路図で、 ／１は２線式伝
送路、ノ為イブリッドコイル１２は１次巻線／コミが伝
送路／／へ接続さｔＬ″、２次巻線／Ｊｂと８次巻線／
２ ａとは夫々一端が接続され、平衡結線網としての可
変抵抗Ｒ・を介して端局装置１３の送信部Ａと受信部Ｂ
とに接続される。この場合、ノ・イブリッドコイル１２
の１次、２次、８次巻線／コａ〜／：ｌｃのインピーダ
ンスは６００Ω、８００Ω、８００Ωとなるように巻装
される。Embodiments of the present invention will be described below with reference to the drawings. Second
The figure is a circuit diagram of the first embodiment of the present invention, where /1 is a two-wire transmission line, so the hybrid coil 12 is the primary winding, and the hybrid coil 12 is connected to the transmission line //tL'', the secondary winding. /Jb and 8th winding/
2a is connected at one end to each terminal, and is connected to the transmitting section A and the receiving section B of the terminal device 13 via a variable resistor R as a balanced connection network.
connected to. In this case, no hybrid coil 12
The impedances of the primary, secondary, and 8th windings/cores a to :lc are 600Ω, 800Ω, and 800Ω.
ハイブリッドコイルｌコの可変抵抗Ｒ＠ヲ伝送路ｉｉに
インピーダンスマツチングさせるには、端局装置１３の
送信部ＡのインピーダンスＺＡ’１６０００゜受信部Ｂ
のインピーダンスｚＢｋ８００Ωで終端し、伝送路／／
のインピーダンスｚｃｖｉ−１５０Ω。In order to perform impedance matching on the variable resistance R of the hybrid coil l and the transmission line ii, the impedance of the transmitter A of the terminal device 13 is set to ZA'16000° and the receiver B
Terminated with impedance zBk800Ω, transmission line //
The impedance of zcvi-150Ω.
８００Ω、６００Ω、８００Ωと順次変えた場合に、平
衡結線網としての可変抵抗Ｒ６を加減し、端局装置１３
の送信部Ａから受信部Ｂに到達する送信信号が最小とな
るときの抵抗値に設定する。When changing 800Ω, 600Ω, and 800Ω sequentially, the variable resistance R6 as a balanced connection network is adjusted and the terminal equipment 13
The resistance value is set to the value at which the transmission signal reaching the receiving section B from the transmitting section A becomes the minimum.
第３図における点線で示した曲線１００は上記の測定結
果であって、伝送路／／のインピーダンスｚｏが１５０
，８００，６００，８００Ωのときに、可変抵抗只。の
値を夫々８０，１５０，８００゜８６０Ωに選定すると
、ハイブリッドコイルの反響損失（］！！ＲＬ ） ｆ
ｉｔ約８８，８５，８０，２８ａｂとなることを示・す
。なお°１曲線２００は可変抵抗Ｒ０の値を３０００に
固定し、伝送路／ｌのインピーダンスを変えた場合の測
定値である。従って１本実施例によると、伝送路／ｌの
インピーダンスを６０００であると想定した場合に比べ
、実際の伝送路インピーダンスｚＯが１６０Ω、３００
Ωであるときには１反響損失が夫々的２５ａｂ、１７ａ
ｂも改善できる。A curve 100 indicated by a dotted line in FIG. 3 is the above measurement result, and the impedance zo of the transmission line // is 150.
, 800, 600, 800Ω, only variable resistance. When the values of are selected as 80, 150, 800°860Ω, respectively, the reverberation loss of the hybrid coil (]!!RL) f
It is shown that it is approximately 88, 85, 80, 28ab. Note that the °1 curve 200 is a measured value when the value of the variable resistor R0 is fixed at 3000 and the impedance of the transmission line /l is changed. Therefore, according to this embodiment, the actual transmission line impedance zO is 160Ω, 300Ω, compared to the case where the impedance of the transmission line /l is assumed to be 6000Ω.
When Ω, one reverberation loss is 25ab, 17a, respectively.
b can also be improved.
第４図は本発明の第２実廁例を示す電気回路図である。FIG. 4 is an electrical circuit diagram showing a second practical example of the present invention.
同図においては、２線式伝送路／ｌと端局装置力の送信
部Ａと受信部Ｂとの結合にハイプリ７ドーｊイル、２Ｇ
とＪとを用いる。ハイブリッドコイルＪについては１巻
１８２４１ ａを端局装置力の送信部ＡＫ接続し１巻線
２’ｌ ｂの一端を伝送路／／の一端へ接続し、他端を
ハイブリッドコイルＪの巻線Ｊｂの一端に接続する。ま
た巻線２弘Ｃの一端は可変抵抗Ｒ０の一端へ接続すると
共に他端はノ）イブリッドコイル、２３の巻線；２３
ｃの一端へ持続する。・・イブリッドコイルｊについて
も同様に、巻ａ２！； ａ ｆ端局装置力の受信部Ｂに
接続し１巻線ｊＣの他端全可変抵抗＆の他端へ接続し１
巻線ノｊｂの他端を２線式伝送路ｌ／の他端へ接続する
。In the same figure, the connection between the two-wire transmission line /1 and the transmitting section A and receiving section B of the terminal equipment includes a high-precision 7-wire, 2G
and J are used. For the hybrid coil J, connect the first winding 18241a to the transmitter AK of the terminal device power, connect one end of the first winding 2'lb to one end of the transmission line //, and connect the other end to the winding Jb of the hybrid coil J. Connect to one end of the Also, one end of the winding 2HiroC is connected to one end of the variable resistor R0, and the other end is the winding of the hybrid coil, 23;
persists to one end of c. ...Similarly for hybrid coil j, volume a2! ; a f Connect to the receiving part B of the terminal station device power, connect 1 winding jC other end to all variable resistors & the other end 1
The other end of winding node jb is connected to the other end of two-wire transmission line l/.
上記の回路構成において、第１実施例の場合と同様に、
平衡結線網の可変抵抗凡を加減し端局装置力の送信部Ａ
から受信部Ｂに到達する送信信号が最小となるときの抵
抗値に設定して反響損失特性を求める。この特性は、＠
５図の曲＠３００となる。曲線４００は可変抵抗Ｒ，’
！１８００Ωに設定し。In the above circuit configuration, as in the first embodiment,
The transmitting section A of the end station equipment adjusts the variable resistance of the balanced wiring network.
The reverberation loss characteristic is determined by setting the resistance value at which the transmission signal reaching the receiving section B is the minimum. This characteristic is @
The song in figure 5 is @300. Curve 400 represents variable resistance R,'
! Set it to 1800Ω.
伝送路ｌ／のインピーダンスｚＯを変化させた場合の反
響損失特性である。上記曲線３００と４００との対比か
ら１本実施例は伝送路／／のインピーダンス＝ｉ８００
Ωであると想定したときよりも、実際の線路インピーダ
ンスＺＣが２００．４００゜８００Ωである場合には１
反響損失（ＥＲＬ ）が夫々約６８．５５．５０ａｂも
改善される。This is the reverberation loss characteristic when the impedance zO of the transmission line l/ is changed. From the comparison between the curves 300 and 400 above, the impedance of the transmission line // is i800 in this embodiment.
1 when the actual line impedance ZC is 200.400°800Ω than when assuming that it is Ω.
The reverberation loss (ERL) is improved by about 68.55.50 ab, respectively.
以上説明から明らかなように１本発明によると。As is clear from the above description, one aspect of the present invention is as follows.
特性インピーダンスが規定されていない伝送路の使用に
際し、端局装置における反響損失特性を著しく改善でき
る。本発明はどの改善によって、伝送路と端局装置との
間にアッテネータを挿入し信号対雑音比を改善する従来
方式に比べ、アッテネータによる送受信号の減衰もなく
、信号対雑音比の向上を図ることができる。でらに１本
発明は可変抵抗素子を可変とするだけの簡単な回路変更
によって、従来方式にも容易に適用できる外・に、伝送
路が６０００に規定された回線の使用に際しても対応が
容易であって、汎用性がある等実用上重要な効果を奏す
る。When using a transmission path for which characteristic impedance is not specified, the reverberation loss characteristics in the terminal equipment can be significantly improved. The present invention improves the signal-to-noise ratio without attenuating the transmitted and received signals due to the attenuator, compared to the conventional method in which an attenuator is inserted between the transmission line and the terminal equipment to improve the signal-to-noise ratio. be able to. In addition, the present invention can be easily applied to conventional systems by simply changing the circuit by making the variable resistance element variable, and can also be easily applied to lines whose transmission line is regulated by 6000. This has important practical effects such as versatility.
第１商は遠方監視制御装置の構成図、第２図は本発明の
第１実施例の回路図、第８図は第１実施例の伝送路のイ
ンピーダンスと反響損失特性図。
第４図は第２実施例の回路図、第５商は第２実施例の伝
送路インピーダンスと反響損失特性図であるＯ
／／・・・２線式伝送路、ｌ−・・・ノ・イブリントコ
イル。
／３・・・端局装置、Ｐ。・・・可変抵抗、Ａ・・・送
信部、Ｂ・・・受信部、Ｚ○・・・伝送路のインピーダ
ンス、、２ｊ・・・端局装置、Ｊ４’、Ｊｊ・・・ノ・
イブリントコイル。
第１図
第２図
−Ｚｃ［司The first quotient is a configuration diagram of a remote monitoring and control device, FIG. 2 is a circuit diagram of a first embodiment of the present invention, and FIG. 8 is a diagram of impedance and reverberation loss characteristics of a transmission line in the first embodiment. Figure 4 is a circuit diagram of the second embodiment, and the fifth quotient is a transmission line impedance and reverberation loss characteristic diagram of the second embodiment. Evelint Coil. /3...Terminal equipment, P. ...Variable resistance, A...Transmission section, B...Reception section, Z○...Transmission path impedance, 2j...Terminal device, J4', Jj...No.
Evelint Coil. Figure 1 Figure 2 - Zc
Claims (1)
４線式端局装置とが・・イブリッドコイルで連結されて
いるものにおいて、前記ハイブリッドコイルの平衡結線
網を可変抵抗素子で形成し。 前記端局装置の反響損失が最小値となるように前記可変
抵抗素子を調整することを特徴とするハイブリッドコイ
ルの反響損失特性の改善方法。[Claims] In a system in which a two-wire transmission line whose characteristic impedance is not defined and a four-wire terminal device are connected by a hybrid coil, the balanced wiring network of the hybrid coil is connected to a variable resistance element. Formed with. A method for improving reverberation loss characteristics of a hybrid coil, comprising adjusting the variable resistance element so that the reverberation loss of the end station device becomes a minimum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP690583A JPS59132248A (en) | 1983-01-19 | 1983-01-19 | Method for improving echo loss characteristic of hybrid coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP690583A JPS59132248A (en) | 1983-01-19 | 1983-01-19 | Method for improving echo loss characteristic of hybrid coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59132248A true JPS59132248A (en) | 1984-07-30 |
Family
ID=11651244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP690583A Pending JPS59132248A (en) | 1983-01-19 | 1983-01-19 | Method for improving echo loss characteristic of hybrid coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59132248A (en) |
-
1983
- 1983-01-19 JP JP690583A patent/JPS59132248A/en active Pending
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