JPS59161197A - Polarity inversion control device of subscriber's telephone circuit - Google Patents
Polarity inversion control device of subscriber's telephone circuitInfo
- Publication number
- JPS59161197A JPS59161197A JP3444883A JP3444883A JPS59161197A JP S59161197 A JPS59161197 A JP S59161197A JP 3444883 A JP3444883 A JP 3444883A JP 3444883 A JP3444883 A JP 3444883A JP S59161197 A JPS59161197 A JP S59161197A
- Authority
- JP
- Japan
- Prior art keywords
- shift register
- signal
- connection state
- circuit
- output
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は加入電話回線の極性反転制御装置の改良に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a polarity reversal control device for a subscriber telephone line.
電話交換機側から加入電話回線を介して個々の電話機を
呼出す場合には、一般に電話回線の極性を反転させ、こ
の状態で呼出し信号を送シ出すようにしている。そして
、電話回線の極性を反転させる手段としては９通常、リ
レーの接点を用いて、電話回線に印加される電圧の極性
をほぼ瞬時に切換えるようにしている。このように、呼
出し時に電話回線の電圧を急激に変化させて極性を反転
させているので、電圧変化時点において電話機のベルが
瞬間的に鳴動することがある。この現象は極性復帰時つ
まシ呼出し停止時にも起こり得る。呼出し時および呼出
し停止時における瞬間的なベル音の発生は、電話機の使
用に関係して生じるので、電話機のみに限って考えれば
全く支障はない。When calling individual telephones from a telephone exchange via a subscriber telephone line, the polarity of the telephone line is generally reversed and a calling signal is sent in this state. As means for reversing the polarity of the telephone line, relay contacts are usually used to switch the polarity of the voltage applied to the telephone line almost instantaneously. As described above, since the voltage of the telephone line is rapidly changed and the polarity is reversed when making a call, the bell of the telephone may ring momentarily at the time of the voltage change. This phenomenon can also occur when the polarity is restored and when the call stops. The instantaneous ringing when a ring is ringing and when a ring is stopped occurs in connection with the use of a telephone, so if only the telephone is considered, there is no problem at all.
一方、最近、加入電話回線を用いて各種のデータを伝送
するデータ通信システムが考えられている。たとえば、
各電話加入者宅の電力、ガス、水道等の使用量をデータ
として、加入電話回線を介して検針用の中実装置に伝送
するようにしたものがある。この種のシステムでは、電
話機と並列にデータ端末装置を接続し、電話機の非使用
時にデータ伝送が行なわれる。従って。On the other hand, recently, data communication systems that transmit various data using subscriber telephone lines have been considered. for example,
There is a system in which the usage of electricity, gas, water, etc. in each telephone subscriber's home is transmitted as data to a solid device for meter reading via the subscriber telephone line. In this type of system, a data terminal device is connected in parallel with a telephone set, and data transmission takes place when the telephone set is not in use. Therefore.
データ通信開始時に電話回線の極性を反転させ。Reverse the polarity of the telephone line when starting data communication.
かつデータ端末装置に１６Ｈｚベル信号の代りに電話機
のベルが鳴動しないような特殊な呼出し信号を送り出し
、データ通信終了後には極性を復帰させる方式がとられ
る。しかし、この場合。A method is adopted in which a special calling signal that does not ring the telephone bell is sent to the data terminal device instead of the 16 Hz bell signal, and the polarity is restored after the data communication is completed. But in this case.
データ通信開始時およびデータ通信終了時に電話機のベ
ルが瞬間的に鳴動する。このようなデータ通信開始時お
よびデータ通信終了時における瞬間的なベル音の発生は
、電話機の非使用時に起こるため、以下の欠点を生む。The phone's bell rings momentarily at the start and end of data communication. This instantaneous ringing at the start and end of data communication occurs when the telephone is not in use, resulting in the following drawbacks.
即ち、データ通信開始時およびデータ通信終了時に電話
機のベルが瞬間的とはいえ鳴動することは、加入者に呼
出しがあったものと誤認させる虞れがあり、また、瞬間
的なベル音であるため不快感を起こさせる原因となる。In other words, if the phone's bell rings, even momentarily, at the start and end of data communication, there is a risk that the subscriber may misunderstand that there is a call; This can cause discomfort.
本発明は、このような事情に鑑みてなされたもので、そ
の目的とするところは、データ通信の開始および終了に
際して、交換機側で加入電話回線の極性を反転および復
帰させるとき、電話機のベルが不必要に鳴動するのを防
止でき。The present invention has been made in view of the above circumstances, and its purpose is to prevent the bell of the telephone from ringing when the exchange side reverses and restores the polarity of the subscriber telephone line at the start and end of data communication. Prevents unnecessary ringing.
加入電話回線の多目的使用化を一層推進させ得る構成簡
単な加入電話回線の極性反転制御装置を提供することＩ
Ｃある。To provide a polarity reversal control device for a subscriber telephone line with a simple configuration capable of further promoting multi-purpose use of the subscriber telephone line.
There is C.
本発明は、極性反転時および極性反転復帰時に線路の電
圧を階段状に緩やかに変化させるようにしたことを特徴
とする。The present invention is characterized in that the voltage of the line is changed gradually in a stepwise manner when the polarity is reversed and when the polarity is restored.
即ち９本発明によれば、クロックを基本として、第１設
定状態において信号出力群を順次シフトし、第２設定状
態において前記信号出力群を順次逆シフトする。予め定
められた段数のシフトレジスタと、前記シフトレジスタ
の信号出力群を受けて階段状の駆動を行なうためのドラ
イブ回路と、交換機の電源を前記ドライブ回路により階
段状波形として出力する出力回路と。That is, according to the present invention, the signal output group is sequentially shifted in the first setting state and the signal output group is sequentially reversely shifted in the second setting state based on the clock. A shift register having a predetermined number of stages, a drive circuit for receiving a group of signal outputs from the shift register and performing stepwise driving, and an output circuit for outputting power of the exchange as a stepwise waveform by the drive circuit.
該出力回路の出力端と２線の加入電話回線とを第１接続
状態または第２接続状態に切替接続する切替回路と、加
入電話回線の極性反転を指示する外部からの極性反転指
令信号を受けて前記シフトレジスタ及び前記切替回路を
制御する第１のデコーダとを備え、前記第１のデコーダ
は。a switching circuit that switches and connects the output end of the output circuit and the two-wire subscriber telephone line to a first connection state or a second connection state; and a switching circuit that receives a polarity reversal command signal from the outside that instructs polarity reversal of the subscriber telephone line. and a first decoder that controls the shift register and the switching circuit.
前記極性反転指令信号の開始時または復帰時から、前記
シフトレジスタの順次シフトが終了したことを知らしめ
る終点検出信号の入力までの時間、前記シフトレジスタ
を前記第１設定状態に設定し、前記終点検出信号の入力
から前記極性反転指令信号の復帰時または開始時までの
時間、前記シフトレジスタを前記第２設定状態に設定す
ると共に、前記極性反転の開始時の終点検出信号の入力
時に、前記切替回路を前記第１接続状態から前記第２接
続状態に切替えて該第２接続状態に保持させ、前記極性
反転の復帰時の終点検出信号の入力時に、前記切替回路
を前記第２接続状態から前記第１接続状態に切替えて該
第１接続状態に保持させることを特徴とする加入電話回
線の極性反転制御装置が得られる。The shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state. The shift register is set to the second setting state during the time from the input of the detection signal to the return or start of the polarity reversal command signal, and the switching is performed when the end point detection signal at the start of the polarity reversal is input. The circuit is switched from the first connection state to the second connection state and held in the second connection state, and when the end point detection signal at the time of returning from the polarity inversion is input, the switching circuit is switched from the second connection state to the second connection state. There is obtained a polarity reversal control device for a subscriber telephone line, which is characterized in that it switches to a first connection state and maintains the first connection state.
更に本発明によれば、前記シフトレジスタと前記ドライ
ブ回路との間に挿入接続された第２のデコーダを更に備
え、該第２のデコーダは。Further, according to the present invention, the second decoder further includes a second decoder inserted and connected between the shift register and the drive circuit.
前記シフトレジスタの前記第１設定状態における信号出
力群をそのまま出力し、前記シフトレ反転制御装置が得
られる。The shift register inversion control device is obtained by outputting the signal output group of the shift register in the first setting state as is.
以下９本発明の実施例について図面を参照して説明する
。Hereinafter, nine embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例に係る極性反転制御装置を示
すもので、この極性反転制御装置は交換機のたとえばデ
ータ通信専用の特殊トランク内に設けられる。FIG. 1 shows a polarity reversal control device according to an embodiment of the present invention, and this polarity reversal control device is installed in, for example, a special trunk dedicated to data communication of an exchange.
本実施例の極性反転制御装置は、直流電源１０の電圧が
定常的にはそのまま現われる正電圧側出力端子Ｙと負電
圧側出力端子Ｘ、直流ループ検出用リレー４０．切換回
路５０９通話路６０への接続端子ＴとＲ，データ通信時
に導通せしめられる通話路６０．加入電話回線７０の端
子り。The polarity reversal control device of this embodiment includes a positive voltage side output terminal Y, a negative voltage side output terminal X, where the voltage of the DC power supply 10 appears as it is on a steady basis, and a DC loop detection relay 40. The switching circuit 509 connects terminals T and R to the communication path 60, and the communication path 60 is made conductive during data communication. Terminal of subscriber telephone line 70.
とＬ２を、順次弁して主要部が加入電話回線７０に接続
される構成を有している。本実施例は。and L2 are sequentially connected to the subscriber telephone line 70. This example is.
更に、前記正電圧側出力端子Ｙと負電圧側出力端子Ｘに
階段状波形の電圧を与える電圧可変回路としての階段状
波形発生回路３０と２階段状波形発生回路３０に階段状
波形の各ステップタイミングを知らしめる為にシフトま
たは逆シフトするタイミング信号出力群を与えるタイミ
ング回路２０と、データ通信の開始および終了時に上記
タイミング回路２０および上記切換回路５０を制御する
制御部８０とを前記主要部として備えた構成となってい
る。Further, a stepped waveform generation circuit 30 as a voltage variable circuit that provides a stepwise waveform voltage to the positive voltage side output terminal Y and the negative voltage side output terminal The main parts include a timing circuit 20 that provides a timing signal output group that is shifted or reversed to notify the timing, and a control section 80 that controls the timing circuit 20 and the switching circuit 50 at the start and end of data communication. It has a well-equipped structure.
上記階段状波形発生回路３０は、上記タイミング回路２
０からのタイミング信号出力群の逆シフト時、該タイミ
ング信号出力群とは逆方向に逆シフトする変換タイミン
グ信号出力群を出力するデコーダ３１．前記変換タイミ
ング信号出力群を受けて階段状の駆動を行なうドライブ
回路３２．前記ドライブ回路３２からの駆動により直流
電源１０の出力電圧を階段状波形として正電源側出力端
子Ｙと負電源側出力端子Ｘとの間に出力する出力回路３
３から構成されている。The stepped waveform generation circuit 30 includes the timing circuit 2
When the timing signal output group is reversely shifted from 0, a decoder 31 outputs a converted timing signal output group that is reversely shifted in the direction opposite to the timing signal output group. A drive circuit 32 that receives the conversion timing signal output group and performs stepwise driving. An output circuit 3 that outputs the output voltage of the DC power supply 10 in a stepped waveform between the positive power supply side output terminal Y and the negative power supply side output terminal X by driving from the drive circuit 32.
It consists of 3.
上記制御部８０は、上記タイミング回路２０の出力群の
例えばアンドをとり、終点タイミングを検出するゲート
回路１００．このゲート回路１００からの終点検出信号
りおよび外部からの極性反転指令信号Ａに応動して所定
の出力Ｂ、Ｅを生じるデコーダ９０．デコエダ９０から
出力Ｅが得られたときに励磁され前記切換回路５０の接
点１１１゜１１２を切換えるリレー１１０から構成され
ている。The control section 80 includes a gate circuit 100. which takes, for example, an AND of the output group of the timing circuit 20 and detects the end point timing. A decoder 90 that generates predetermined outputs B and E in response to the end point detection signal from the gate circuit 100 and the polarity inversion command signal A from the outside. The relay 110 is energized and switches the contacts 111 and 112 of the switching circuit 50 when the output E is obtained from the decoeder 90.
次に、上記のように構成された極性反転制御装置の動作
を第２図のタイムチャートに従って説明する。Next, the operation of the polarity reversal control device configured as described above will be explained according to the time chart of FIG. 2.
まず、上記デコーダ９０の入出力論理を述べると９例え
ば、極性反転指令信号Ａがオフで終点検出信号りがオフ
の時、出力Ｂ、Ｅは共にオフであるとし、極性反転指令
信号Ａがオンに変化すると、その変化点で出力Ｂはオン
になり、極性反転指令信号Ａがオンのとき終点検出信号
りがオンに変化すると、その変化点で出力Ｂはオフにな
シ、かつ出力Ｅはオンになる。次に、極性反転指令信号
Ａがオフに変化すると、その変化点で出力Ｂはオンにな
り、極性反転指令信号Ａがオフの時終点検出信号りがオ
ンに変化するとその変化点で出力Ｂはオフになり、かつ
出力Ｅはオフとなる。First, the input/output logic of the decoder 90 will be described. For example, when the polarity inversion command signal A is off and the end point detection signal is off, outputs B and E are both off, and the polarity inversion command signal A is on. When the polarity reversal command signal A is on and the end point detection signal turns on, output B is turned off at that change point and output E is turned on. Turns on. Next, when the polarity reversal command signal A turns off, output B turns on at that point of change, and when the end point detection signal turns on while the polarity reversal command signal A turns off, output B turns on at that point of change. is turned off, and output E is turned off.
さて、平常状態つまシデータ通信が行なわれていない状
態では、切換回路５０の接点１１１゜１１２は図示状態
にあり、信号Ｂはオフ状態にある。したがってこの状態
では９階段状波形発生回路３０の負電源側出力Ｘ、正電
源側出力Ｙ間には、上記直流電源１０の出力電圧Ｖ。Ｋ
等しくかつ負電源側出力Ｘを負とする電圧が現われてお
り、端子Ｒ，Ｔ間にも同じ電圧が現われている。Now, in a normal state where no data communication is being performed, the contacts 111 and 112 of the switching circuit 50 are in the state shown, and the signal B is in the off state. Therefore, in this state, the output voltage V of the DC power supply 10 is present between the negative power supply side output X and the positive power supply side output Y of the nine-step waveform generation circuit 30. K
A voltage that is equal and makes the output X on the negative power supply side negative appears, and the same voltage also appears between terminals R and T.
一方、この平常状態では通話路６０が形成されておらず
、加入電話回線７０の端子Ｌ１．Ｌ、は図示しない加入
者回路内の接続手段により交換機の電源に接続され、端
子Ｌ２には第２図ＦＫ示すように端子り、に対して−Ｖ
。の電圧が印加されている。On the other hand, in this normal state, the communication path 60 is not formed, and the terminal L1. of the subscriber telephone line 70. L, is connected to the power supply of the exchange by a connecting means in the subscriber circuit (not shown), and the terminal L2 is connected to the terminal L2 as shown in FIG.
. voltage is applied.
データ通信の開始に際しては、まず上記加入者回路内の
接続手段による交換機の電源への接続が解かれるととも
に通話路６０が形成され。When starting data communication, first, the connection to the power source of the exchange by the connecting means in the subscriber circuit is disconnected, and the communication path 60 is formed.
端子ＴとＬｌおよびＲとＬ２がそれぞれ接続される。次
いでデコーダ９０の一方の入力端９１に入力する極性反
転指令信号Ａが立上がる。これによりデコーダ９０から
出力Ｂが送出され、この出力Ｂｖｃよってタイミング回
路２０のシフトレジスタ２１が発振器２２の出力タイミ
ングで出力群ＱＡ−ＱＮ′を順次立上げる。出力Ｂがオ
ンの時。Terminals T and Ll and R and L2 are connected, respectively. Next, the polarity inversion command signal A input to one input terminal 91 of the decoder 90 rises. As a result, an output B is sent from the decoder 90, and this output Bvc causes the shift register 21 of the timing circuit 20 to sequentially raise the output group QA-QN' at the output timing of the oscillator 22. When output B is on.
デコーダ３１は入力した信号群ＱＡ−ＱＮをそのままの
順で信号群Ｑａ−Ｑｎに出力するため信号群Ｑａ−Ｑｎ
は信号群ＱＡ−ＱＮと同じタイミングで同じ順に立上が
る。さらに、ドライブ回路３２は信号群Ｑａ−ＱｎＫよ
り次段出力回路６３１１′ｉ：対して階段状の駆動を行
なう。出力回路６３は前記ドライブ回路３２の駆動によ
り直流電源１０の電圧Ｖ。を階段状波形として出力する
。The decoder 31 outputs the input signal group QA-QN in the same order as the signal group Qa-Qn.
rises at the same timing and in the same order as the signal group QA-QN. Further, the drive circuit 32 performs step-like driving on the next stage output circuit 6311'i: using the signal group Qa-QnK. The output circuit 63 receives the voltage V of the DC power supply 10 by driving the drive circuit 32 . Outputs as a step waveform.
駆動方法としては例えば第３図の如く抵抗分割による方
法がある。即ち、信号群Ｑａ−Ｑｎによｐ Ｔｒａ−Ｔ
ｒｎをオンさせる事で、ＲａｘＲｎのうちＴｒａ＝Ｔｒ
ｎのオンしているものと組となっ、ているものの合成抵
抗と＋ ＲＯとにより直流電源１０の電圧Ｖ。を抵抗分
割した電圧を端子Ｘ、Ｙに出力する事ができる。As a driving method, for example, there is a method using resistance division as shown in FIG. That is, by the signal group Qa-Qn, p Tra-T
By turning on rn, Tra=Tr of RaxRn
The voltage V of the DC power supply 10 is determined by the combined resistance of the n on-on and +RO. The voltage obtained by dividing the voltage by resistance can be output to terminals X and Y.
次に、タイミング回路２０の出力信号群Ｑ Ａ −Ｑ
Ｎが例えば全てオンＶＣなったとき、終点検出信号りが
番２図りの如く立上がる。デコーダ９０は。Next, the output signal group Q A −Q of the timing circuit 20
For example, when all of N are on VC, the end point detection signal rises as shown in number 2. The decoder 90 is.
前記終点検出信号りが入力すると、出力Ｂを立下げ、出
力Ｅを立上げる。出力Ｂが立下がると。When the end point detection signal is input, output B is lowered and output E is raised. When output B falls.
シフトレジスタ２１は第２図ＱＡ−ＱＮの如く出力信号
群ＱＡ−ＱＮを順次立下げる。またデコーダ３１は信号
Ｂが立下がった事で入力信号群ＱＡ〜ＱＮｖｒ一対して
逆順序にＱａ−Ｑｎを出力する。例えばＱＡＶｉＱｎに
＋ ＱＮはＱａに出力するようになっているため、デコ
ーダ６１の出力群は第２図Ｑａ〜Ｑｎの如く立上がった
時とは逆の順ですなわちＱｎ＋Ｑｎ−’＋・・・＋Ｑａ
の順で順次立下がる。したがってドライブ回路３２．出
力回路３３を経て階段状波形が出力される。The shift register 21 sequentially lowers the output signal group QA-QN as shown in FIG. 2 QA-QN. Further, since the signal B falls, the decoder 31 outputs Qa-Qn in reverse order for the input signal group QA-QNvr. For example, +QN of QAViQn is outputted to Qa, so the output group of the decoder 61 is output in the reverse order of rising as shown in FIG. 2 Qa to Qn, that is, Qn+Qn-'+...+Qa.
They fall sequentially in this order. Therefore, the drive circuit 32. A stepped waveform is output via the output circuit 33.
ここで信号出力群Ｑａ−Ｑｎの各信号が立上がっている
時、前記ドライブ回路６２よシ駆動される電圧をそれぞ
れＶａ〜ｖｎとしＶａ）Ｖｂ）・・・＞Ｖｎと設定して
おけば、信号群Ｑａ−Ｑｎの立上がり時には出力回路５
３の出力端子Ｘ、Ｙには端子Ｘ側を負として第２図Ｃの
如く階段状に立上がる出力が得られ、信号群Ｑａ＝Ｑｎ
の立下がり時には階段状に立下がる出力が得られる。ま
た終点検出信号りが立上がった時に出力Ｅによリリレー
１１０が励磁され、これによって切換回路５０の接点１
１１＊ １１２がそれぞれ切換わり、加入電話回線７０
の端子り、、Ｌ２と階段状波形発生回路３０の出力端子
Ｘ、Ｙとの接続関係が切換えられる。したがって加入電
話回線７０にはその時点から逆極性の電圧が印加されは
じめる。つまり端子Ｌ２をとってみると第２図Ｆの如く
端子Ｌ１に対して正方に漸時増大する電圧が印加される
ことになる。そしてこの正方への電圧変化が終了した時
点で端子Ｌ２には端子り、に対して＋ｖｏの電圧が印加
される。Here, when each signal of the signal output group Qa-Qn is rising, the voltages driven by the drive circuit 62 are set as Va to vn, respectively, and Va)Vb)...>Vn. When the signal group Qa-Qn rises, the output circuit 5
At the output terminals X and Y of 3, an output rising in a stepwise manner as shown in FIG. 2C is obtained with the terminal X side being negative, and the signal group Qa=Qn
When the voltage falls, an output that falls in a stepwise manner is obtained. Furthermore, when the end point detection signal rises, the relay 110 is excited by the output E, and this causes the contact 1 of the switching circuit 50 to
11 * 112 are switched respectively, and the subscriber telephone line 70
The connection relationship between the terminals , L2 and the output terminals X and Y of the stepped waveform generating circuit 30 is switched. Therefore, a voltage of opposite polarity begins to be applied to subscriber telephone line 70 from that point on. In other words, when terminal L2 is taken, a voltage that gradually increases in a square direction is applied to terminal L1 as shown in FIG. 2F. When this voltage change in the square direction is completed, a voltage of +vo is applied to the terminal L2.
また一方、データ通信の終了に際しては、まず上記極性
反転指令信号Ａが立下がると、再びデコーダ９０からの
出力Ｂがオンとなり、この出力Ｂによってタイミング回
路２０の出力信号群ＱＡ−ＱＮが順次立上がる。したが
って前述の極性反転の場合と同様にして出力信号群ＱＡ
〜ＱＮの立上がシ開始、終点タイミング検出、出力Ｂの
立下がりによる出力信号群ＱＡ−ＱＮの立下がり開始、
切換回路５０の切換動作という一連の動作が行なわれる
。この場合には切換回路５０の接点１１１．１１２が図
示とは逆の接続関係から一連の動作が開始される。した
がって端子Ｌ２には第２図Ｆに示す様に端子Ｌ１に対し
て負方向に漸時減少する電圧が印加される。そして。On the other hand, at the end of data communication, when the polarity inversion command signal A falls, the output B from the decoder 90 is turned on again, and this output B causes the output signals QA-QN of the timing circuit 20 to rise in sequence. Go up. Therefore, the output signal group QA is
~QN starts to rise, end point timing is detected, output signal group QA-QN starts to fall due to the fall of output B,
A series of operations called switching operations of the switching circuit 50 are performed. In this case, a series of operations is started with the contacts 111 and 112 of the switching circuit 50 in a connection relationship opposite to that shown. Therefore, a voltage is applied to the terminal L2 that gradually decreases in the negative direction with respect to the terminal L1, as shown in FIG. 2F. and.
この負方向への電圧変化が終了した時点で端子Ｌ２には
端子り、に対して−ｖｏの電圧が印加されることになる
。更にこの時点で通話路６０の接続が解除され、前述の
平常状態に復帰する。When this voltage change in the negative direction ends, a voltage of -vo is applied to the terminal L2. Further, at this point, the communication path 60 is disconnected, and the normal state described above is restored.
なお、第２図の最下部に、シフトレジスタ２１の第１設
定状態、第２設定状態、及び切替回路５０の第１接続状
態、第２接続状態を示しておく。Note that the first setting state and second setting state of the shift register 21, and the first connection state and second connection state of the switching circuit 50 are shown at the bottom of FIG.
以上述べたように本発明によれば、極性反転およびその
復帰時に線路の電圧を緩やかに変化させる事で、データ
通信の開始時および終了時に電話機のベルが鳴動する事
を防止でき、電話加入者に不快感を与えることのない円
滑な動作を行なわせ得る加入電話回線の極性反転制御装
置を提供することができる。As described above, according to the present invention, by gently changing the voltage of the line at the time of polarity reversal and its return, it is possible to prevent the telephone bell from ringing at the start and end of data communication. It is possible to provide a polarity reversal control device for a subscriber telephone line that can operate smoothly without causing discomfort to the subscriber telephone line.
また１本発明では、加入電話回線の電圧変化タイミング
および極性反転タイミングとなる終点検出を全て論理的
に行なっている為、従来より提案されている。線路電圧
が０７点になることを判定して極性反転する方式や、タ
イマーを設は一定時間後に極性反転を行なう方式に比べ
。Furthermore, in the present invention, the end point detection, which is the voltage change timing and polarity reversal timing of the subscriber telephone line, is all performed logically, which has been proposed in the past. Compared to a method that inverts the polarity after determining that the line voltage reaches the 07 point, or a method that inverts the polarity after a certain period of time by setting a timer.
極性反転時の電圧変化時間の変動が少なく、また電源電
圧等の変動をうけない。さらに９本発明では、あらかじ
め階段段数を決定しておけば極性反転時における階段状
波形の各ステップ電圧および時間は全て等しくすること
ができ、仮に電圧の変化時間を変える場合でも９発振器
の発振周波数のみ変えるだけでよく、特に調整を必要と
しない。また９本発明では、現在進みつつある交換機側
各装置のディジタル化にも充分対処しうるものであり、
その効果は絶大である。There is little variation in voltage change time when polarity is reversed, and it is not affected by variations in power supply voltage, etc. Furthermore, in the present invention, if the number of steps is determined in advance, each step voltage and time of the stepped waveform at the time of polarity reversal can be made equal, and even if the voltage change time is changed, the 9 oscillation frequency of the oscillator No special adjustment is required. In addition, the present invention can fully cope with the digitization of various devices on the exchange side, which is currently progressing.
The effect is enormous.
第１図は本発明の一実施例による加入電話回線の極性反
転制御装置を示すブロック図、第２図は第１図に示した
極性反転制御装置の動作を説明するためのタイムチャー
ト、第３図は第２図の実施例において用い得るドライブ
回路の駆動方法である。
１０・・・電源、２０・・・タイミング回路、３０・・
・階段状波形発生回路、５０・・・切換回路、６０・・
・通話路、７０・・・加入電話回線の線路、８０・・・
制御部。
９０・・・デコーダ、１００・・・終点検出用ゲート。
１１０・・・リレー、 １１１，１１２・・・接点。FIG. 1 is a block diagram showing a polarity reversal control device for subscriber telephone lines according to an embodiment of the present invention, FIG. 2 is a time chart for explaining the operation of the polarity reversal control device shown in FIG. 1, and FIG. The figure shows a method of driving the drive circuit that can be used in the embodiment of FIG. 10...Power supply, 20...Timing circuit, 30...
- Staircase waveform generation circuit, 50... switching circuit, 60...
・Call path, 70...Line of subscriber telephone line, 80...
control section. 90... Decoder, 100... End point detection gate. 110...Relay, 111,112...Contact.
Claims (1)
出力群を順次シフトし、第２設定状態において前記信号
出力群を順次逆シフトする。予め定められた段数のシフ
トレジスタと、前記シフトレジスタの信号出力群を受け
て階段状の駆動を行なうためのドライブ回路と、交換機
の電源を前記ドライブ回路により階段状波形として出力
する出力回路と、該出力回路の出力端と２線の加入電話
回線とを第１接続状態または第２接続状態に切替接続す
る切替回路と、加入電話回線の極性反転を指示する外部
からの極性反転指令信号を受けて前記シフトレジスタ及
び前記切替回路を制御するデコーダとを備え、前記デコ
ーダは、前記極性反転指令信号の開始時または復帰時か
ら、前記シフトレジスタの順次シフトが終了したことを
知らしめる終点検出信号の入力までの時間、前記シフト
レジスタを前記第１設定状態に設定し、前記終点検出信
号の入力から前記極性反転指令信号の復帰時または開始
時までの時間、前記シフトレジスタを前記第２設定状態
に設定すると共に、前記極性反転の開始時の終点検出信
号の入力時に、前記切替回路を前記第１接続状態から前
記第２接続状態に切替えて該第２接続状態に保持させ、
前記極性反転の復帰時の終点検出信号の入力時に、前記
切替回路を前記第２接続状態から前記第１接続状態に切
替えて該第１接続状態に保持させることを特徴とする加
入電話回線の極性反転制御装量。 ２、クロックを基体として、第１設定状態において信号
出力群を順次シフトし、第２設定状態において前記信号
出力群を順次逆シフトする。予め定められた段数のシフ
トレジスタと、前記シフトレジスタの信号出力群を受け
て階段状の駆動を行なうためのドライブ回路と、交換機
の電源を前記ドライブ回路によシ階段状波崩として出力
する出力回路と、該出力回路の出力端と２線の加入電話
回線とを第１接続状態または第２接続状態に切替接続す
る切替回路と、加入電話回線の極性反転を指示する外部
からの極性反転指令信号を受けて前記シフトレジスタ及
び前記切替回路を制御する第１のデコーダと、前記シフ
トレジスタと前記ドライブ回路との間に挿入接続された
第２のデコーダとを備え、前記第１のデコーダは、前記
極性反転指令信号の開始時または復帰時から、前記シフ
トレジスタの順次シフトが終了したことを知らしめる終
点検出信号の入力までの時間、前記シフトレジスタを前
記第１設定状態に設定し、前記終点検出信号の入力から
前記極性反転指令信号の復帰時または開始時までの時間
、前記シフトレジスタを前記第２設定状態に設定すると
共に、前記極性反転の開始時の終点検出信号の入力時に
、前記切替回路を前記第１接続状態から前記第２接続状
態に切替えて該第２接続状態に保持させ、前記極性反転
の復帰時の終点検出信号の入力時に、前記切替回路を前
記第２接続状態から前記第１接続状態に切替えて該第１
接続状態に保持させ。 前記第２のデコーダは、前記シフトレジスタの前記第１
設定状態における信号出力群をそのまま出力し、前記シ
フトレジスタの前記第２設定状態における信号出力群を
逆順序に出力することを特徴とする加入電話回線の極性
反転制御装置。[Claims] 1. Based on the clock, the signal output group is sequentially shifted in the first setting state, and the signal output group is sequentially reversely shifted in the second setting state. a shift register with a predetermined number of stages; a drive circuit for receiving a group of signal outputs from the shift register to perform stepwise driving; and an output circuit for outputting the power of the exchange in the form of a stepwise waveform by the drive circuit; a switching circuit that switches and connects the output end of the output circuit and the two-wire subscriber telephone line to a first connection state or a second connection state; and a switching circuit that receives a polarity reversal command signal from the outside that instructs polarity reversal of the subscriber telephone line. and a decoder that controls the shift register and the switching circuit, and the decoder generates an end point detection signal indicating that the shift register has finished sequentially shifting from the start or return of the polarity inversion command signal. The shift register is set to the first setting state during the time until the input, and the shift register is set to the second setting state during the time from the input of the end point detection signal until the return or start of the polarity reversal command signal. setting, and when an end point detection signal is input at the start of the polarity reversal, the switching circuit is switched from the first connection state to the second connection state and maintained in the second connection state;
The polarity of the subscriber telephone line, characterized in that when an end point detection signal is input when the polarity reversal is restored, the switching circuit is switched from the second connection state to the first connection state and maintained in the first connection state. Reversal control charge. 2. Based on the clock, the signal output group is sequentially shifted in the first setting state, and the signal output group is sequentially reversely shifted in the second setting state. a shift register with a predetermined number of stages; a drive circuit for receiving a group of signal outputs from the shift register to perform stepwise driving; and an output for outputting the power of the exchanger to the drive circuit as a stepwise waveform. a switching circuit that connects the output end of the output circuit and the two-wire subscriber telephone line to a first connection state or a second connection state; and an external polarity reversal command that instructs polarity reversal of the subscriber telephone line. A first decoder that receives a signal and controls the shift register and the switching circuit, and a second decoder inserted and connected between the shift register and the drive circuit, the first decoder comprising: The shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state, and the shift register is set to the first setting state. The shift register is set to the second setting state during the time from the input of the detection signal to the return or start of the polarity reversal command signal, and the switching is performed when the end point detection signal at the start of the polarity reversal is input. The circuit is switched from the first connection state to the second connection state and held in the second connection state, and when the end point detection signal at the time of returning from the polarity inversion is input, the switching circuit is switched from the second connection state to the second connection state. Switch to the first connection state and connect the first connection state.
Keep it connected. The second decoder decodes the first decoder of the shift register.
A polarity reversal control device for a subscriber telephone line, characterized in that the signal output group in the set state is outputted as is, and the signal output group in the second set state of the shift register is outputted in reverse order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3444883A JPS59161197A (en) | 1983-03-04 | 1983-03-04 | Polarity inversion control device of subscriber's telephone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3444883A JPS59161197A (en) | 1983-03-04 | 1983-03-04 | Polarity inversion control device of subscriber's telephone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59161197A true JPS59161197A (en) | 1984-09-11 |
Family
ID=12414528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3444883A Pending JPS59161197A (en) | 1983-03-04 | 1983-03-04 | Polarity inversion control device of subscriber's telephone circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59161197A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5257578A (en) * | 1993-01-12 | 1993-11-02 | Heidelberger Druckmaschinen Ag | Device for automatically cleaning blanket cylinders in a offset printing press |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5596755A (en) * | 1979-01-17 | 1980-07-23 | Nec Corp | Terminal starting system |
| JPS57208763A (en) * | 1981-06-19 | 1982-12-21 | Hitachi Ltd | Charging pulse transmitting circuit |
-
1983
- 1983-03-04 JP JP3444883A patent/JPS59161197A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5596755A (en) * | 1979-01-17 | 1980-07-23 | Nec Corp | Terminal starting system |
| JPS57208763A (en) * | 1981-06-19 | 1982-12-21 | Hitachi Ltd | Charging pulse transmitting circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5257578A (en) * | 1993-01-12 | 1993-11-02 | Heidelberger Druckmaschinen Ag | Device for automatically cleaning blanket cylinders in a offset printing press |
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