JPS6059848A - Response detecting circuit - Google Patents
Response detecting circuitInfo
- Publication number
- JPS6059848A JPS6059848A JP16871283A JP16871283A JPS6059848A JP S6059848 A JPS6059848 A JP S6059848A JP 16871283 A JP16871283 A JP 16871283A JP 16871283 A JP16871283 A JP 16871283A JP S6059848 A JPS6059848 A JP S6059848A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detection circuit
- response
- signal
- call signal
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 230000008054 signal transmission Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/026—Arrangements for interrupting the ringing current
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は自動電話交換機の応答検出回路に関する０
〔背景技術〕
第１図は従来例に係る応答検出回路の回路図であり、１
・２はそれぞれ加入者線であるＡ線、Ｂ線である。[Detailed Description of the Invention] [Technical Field] The present invention relates to a response detection circuit for an automatic telephone exchange. [Background Art] Fig. 1 is a circuit diagram of a response detection circuit according to a conventional example.
・2 are subscriber lines A and B, respectively.
８＠４は呼出信号切換えリレー接点（ｒＬ５・６はｈ＠
Ｂｍ切換えリレー接点（ｒｖ）であり、７は放電管（’
Ｉｌ’１８．ベル回路９および送・受話器１２によって
構成されている電話機（’［’ＥＬ ）である。尚、１
１はベル回路切換リレー接点（ト）である。電話機７は
共同電話機であり、図示するように加入者線１または２
に複数個接続されている。１８は電流を検知する入力抵
抗（Ｒ１） ＋ １４は直流分を通過させるローパスフ
ィルタ回路（ＦＩＬ） 、 １６は積分回路で構成され
信号伝達を遅延させる遅延回路（ＤＬＹ） 、１５は遅
延時間を調節するための可変抵抗（ＶＲ）であり、１７
は一定の入力信号レベルが入力すればセット状柱となる
Ｒ−Ｓフリップフロップ（Ｆ’Ｆ）である。２０は１６
Ｈｚの信号周波数を出力する発振器であり、２１は一４
８Ｖの直流電圧源、２２は＋５０Ｖの直流電圧源である
。また１８は呼出信号選択リレー接点（Ｓ）である。8@4 is a call signal switching relay contact (rL5 and 6 are h@
Bm switching relay contact (rv), 7 is the discharge tube ('
Il'18. This is a telephone ('['EL) consisting of a bell circuit 9 and a transmitter/receiver 12. Furthermore, 1
1 is a bell circuit switching relay contact (G). Telephone 7 is a communal telephone and is connected to subscriber line 1 or 2 as shown.
Multiple units are connected to the . 18 is an input resistor (R1) that detects the current, 14 is a low-pass filter circuit (FIL) that allows direct current to pass through, 16 is a delay circuit (DLY) that is composed of an integrating circuit and delays signal transmission, and 15 is a delay time adjuster. It is a variable resistor (VR) for
is an R-S flip-flop (F'F) which becomes a set-shaped column when a certain input signal level is input. 20 is 16
It is an oscillator that outputs a signal frequency of Hz, and 21 is -4
8V DC voltage source, 22 is +50V DC voltage source. Further, 18 is a calling signal selection relay contact (S).
次に従来例に係る応答検出回路の動作の概略を説明する
。不図示の交換機の制御装置からの呼出し指令信号に従
って各リレーが作動する。すなわちリレー接点１８，８
および５の切換りによって特定の電話機７と特定の直流
電圧源が接続される。Next, an outline of the operation of the response detection circuit according to the conventional example will be explained. Each relay operates in accordance with a call command signal from a control device of an exchange (not shown). That is, relay contacts 18, 8
By switching 5 and 5, a specific telephone 7 and a specific DC voltage source are connected.
これにより発振器２０の交流信号に直流電圧−４８Ｖが
重畳した呼出信号が、入力抵抗Ｒ１およびベル回路９を
介して放電管８に印加する。交流信号によりベル回路９
のコイルに電流が流れてベルを鳴動させるとともに高い
負電圧により放電管がブレークダウンを起して直流電流
がアースに流れる（尚、選択された電話機の放電管の耐
圧は−４８Ｖ以下に予め設定されている。）。この電流
に応じて入力抵抗Ｒ１の両端に電圧が印加するが、回路
のシリーズ抵抗が比較的大きい（数にΩ程度）ので電流
値は小さく従って入力電圧は小さい。このため、フィル
ター回路１４および遅延回路１６を介してフリップフロ
ップ１７のセット入力に入力する電圧は小さくセットさ
れない。As a result, a calling signal in which a DC voltage of -48V is superimposed on the AC signal of the oscillator 20 is applied to the discharge tube 8 via the input resistor R1 and the bell circuit 9. Bell circuit 9 by AC signal
Current flows through the coil, causing the bell to ring, and the high negative voltage causes the discharge tube to break down, causing a DC current to flow to the ground. ). A voltage is applied across the input resistor R1 in accordance with this current, but since the series resistance of the circuit is relatively large (approximately Ω), the current value is small and the input voltage is therefore small. Therefore, the voltage input to the set input of flip-flop 17 via filter circuit 14 and delay circuit 16 is not set small.
ベルの鳴動を検知した被呼者が送・受話器１２を取って
オフ・フックするとリレー接点１１が切換る。When the called party detects the ringing of the bell and picks up the transmitter/receiver 12 and goes off-hook, the relay contact 11 switches.
これにより直流負電源２１．リレー接点１８．入力抵抗
１８．リレー接点８・５・１１．送・受話器１２．リレ
ー接点６拳４およびシリーズ抵抗（Ｒ２） １９を通じ
て閉回路が形成される。この閉回路の総シリーズ抵抗は
比較的小さいので（数百Ω程度）電流値は大きい。この
ため抵抗Ｒ１に印加する直流入力電圧はフィルタ回路１
４および遅延回路１６を介してフリップフロップ１７の
セット入力に入力して７リツプフシツブ１７をセット状
態にする。不図示の交換機の制御装置はこれを検知して
、リレー接点８・４を切換えて、通話可能状態に設定す
る。As a result, the DC negative power supply 21. Relay contact 18. Input resistance 18. Relay contacts 8, 5, 11. Transmitter/receiver 12. A closed circuit is formed through the relay contacts 6 and 4 and the series resistor (R2) 19. Since the total series resistance of this closed circuit is relatively small (about several hundred ohms), the current value is large. Therefore, the DC input voltage applied to the resistor R1 is
4 and delay circuit 16 to the set input of flip-flop 17 to set flip-flop 17. A control device of the exchange (not shown) detects this, switches the relay contacts 8 and 4, and sets the communication ready state.
尚、ローパスフィルタ回路１４の後段に遅延回路１６を
設けているのは、リレー接点等の切換り時に流れる瞬時
電流や放電管８のブレークダウン時の電流変動を吸収し
、フリップフロップ１７へ誤信号が伝達するのを防止す
るためである。The reason why the delay circuit 16 is provided after the low-pass filter circuit 14 is to absorb the instantaneous current that flows when switching relay contacts, etc. and the current fluctuation when the discharge tube 8 breaks down, and prevents an erroneous signal from being sent to the flip-flop 17. This is to prevent the transmission of information.
ところで従来例に係る回路では、電話機の接続台数や加
入者線路長により、加入者呼出し中に流れる電流値が異
なる。このためｐ−ノシスフイルタ回路１４の入力抵抗
に加わる電圧もそれに応じて異なるので、誤応答検出を
防止するためには可変抵抗１５をその都度調節する必要
があった。勿論、可変抵抗１５の抵抗値を十分大きくと
れば調節の必要は無くなるが、応答時の検出時間が不必
要に長くなり問題であった。By the way, in the circuit according to the conventional example, the value of the current flowing during a subscriber call varies depending on the number of connected telephones and the length of the subscriber line. For this reason, the voltage applied to the input resistance of the p-nosis filter circuit 14 varies accordingly, so it is necessary to adjust the variable resistor 15 each time to prevent erroneous response detection. Of course, if the resistance value of the variable resistor 15 is set to a sufficiently large value, there is no need for adjustment, but the detection time at the time of response becomes unnecessarily long, which is a problem.
本発明は上記の点に鑑み提案されたものであり、不平衡
放電管付きベル回路を備えた電話機が複数個接続された
共同加入者線において、無調整でかつ短時間内の確実な
応答検出を可能とする応答検出回路の提供を目的とする
。The present invention has been proposed in view of the above points, and provides reliable response detection within a short time without adjustment in a common subscriber line to which a plurality of telephones equipped with unbalanced discharge tube bell circuits are connected. The purpose of the present invention is to provide a response detection circuit that enables the following.
本発明は呼出し信号送出側に設けられた過電流検出回路
と呼出し信号帰線側に設けられた応答信号検出回路とに
よって構成される。The present invention includes an overcurrent detection circuit provided on the calling signal sending side and a response signal detection circuit provided on the calling signal return line side.
図面を参照しながら本発明の実施例に係る応答検出回路
の構成を説明する。第２図はその構成図であり、符番は
第１図と共通である。図において、２８は短絡等の事故
により大電流が流れたときこれを検知し、交換機の制御
回路に送信する過電流検出回路（ＯＯＤ）である。入力
抵抗１８．フィルタ回路１４．遅延回路１６およびフリ
ップフロップ回路１７で構成される本発明の実施例に係
る応答信号検出回路は帰線側に接続されている。The configuration of a response detection circuit according to an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a configuration diagram thereof, and the reference numerals are the same as in FIG. 1. In the figure, 28 is an overcurrent detection circuit (OOD) that detects when a large current flows due to an accident such as a short circuit and sends the detected signal to the control circuit of the exchange. Input resistance 18. Filter circuit 14. The response signal detection circuit according to the embodiment of the present invention, which is composed of a delay circuit 16 and a flip-flop circuit 17, is connected to the return line side.
次に本発明の実施例に係る応答信号検出回路の動作につ
いて説明する。呼出し時、所定の電話機７が選択される
と、内蔵する放電管８がブレークダウンして呼出し信号
電流が流れる。しかし、応答信号検出回路は帰線側に接
続されているので、電話機の種類や接続台数あるいは加
入者線路長が変わることによって信号電流値が変動して
も応答信号検出回路には何らの影響もない。また、呼出
し信号送出側の短絡等により大電流が流れると過電流検
出回路２８はこれを検知してアラーム信号（ＡＬＭ）を
交換機の制御回路に送出する。制御回路は所定のリレー
を切換え、短絡状態の回路を開放して電流の流れを停止
させる。Next, the operation of the response signal detection circuit according to the embodiment of the present invention will be explained. When a predetermined telephone 7 is selected during a call, the built-in discharge tube 8 breaks down and a call signal current flows. However, since the response signal detection circuit is connected to the return line side, even if the signal current value changes due to changes in the type of telephone set, number of connected telephones, or subscriber line length, there is no effect on the response signal detection circuit. do not have. Further, if a large current flows due to a short circuit or the like on the calling signal sending side, the overcurrent detection circuit 28 detects this and sends an alarm signal (ALM) to the control circuit of the exchange. The control circuit switches predetermined relays to open the shorted circuit and stop the flow of current.
以上説明したように本発明は呼出し信号送出側に過電流
検出回路を、また呼出し信号帰線側に応答信号検出回路
を接続する構成であるから、不平衡放ＴＴｆ、管イ」き
ベル回路の電話機台数や加入者線路隣の変ＩＩｔＩＩノ
に対応した調整を行うことなしに確実な応答検出がｉＴ
ｆｉＬ’であるとともに応答検出時間を短縮できる効
果が得られる。As explained above, the present invention has a configuration in which an overcurrent detection circuit is connected to the calling signal sending side and a response signal detection circuit is connected to the calling signal return side. Reliable response detection without having to make adjustments to accommodate the number of telephones or variations in the number of subscriber lines.
fiL' and the effect of shortening the response detection time can be obtained.
４、川向の１１０車な＋ｆｉ２明 第１図は従来例に係る応答検出回路の構成図。4. Kawamukai's 110 car + fi2 Akira FIG. 1 is a configuration diagram of a response detection circuit according to a conventional example.
第２図は本発明の実施例に係る応答検出回路の構成図で
ある。FIG. 2 is a configuration diagram of a response detection circuit according to an embodiment of the present invention.
■、２・・・加入者線 ３〜６．１１．、１８・・・リ
レー接線７ ・・・ １１イ１１１古 Ｃ鵠 ８ ・・
・ 放 η工管（１）９・・・ベル回路 １２・・・送
・受話器１３．１９・・・抵抗 ］−４・・・ローパス
フ・ｒルタ１１腑（ＦＩＬ）１５・・・叶変抵１’＋’
＋’、 （Ｖ Ｈ，） １（３・・・遅低回路（−ＤＩ
、Ｙ）１７・・・７リツブ７０ツブ（ｌｉ’ ｌｉ’
） ２０・・・発振器２１、 ２２−１１′＋、 ｉ’
ｒｉ＋、 ’ｒｌｆ圧シ摩′トｒ・誦出願人 日本電気
株式会肚
第 ２ 図■, 2...Subscriber line 3-6.11. , 18... Relay tangent 7... 11i 111 old C 8...
・ Emission η pipe (1) 9...Bell circuit 12...Sending/receiving device 13.19...Resistance ]-4...Low pass filter 11 (FIL) 15...Kei transformer 1'+'
+', (V H,) 1 (3... slow low circuit (-DI
, Y) 17...7 ribs 70 ribs (li'li'
) 20...Oscillator 21, 22-11'+, i'
ri+, 'rlf pressure crimping' Tr・Recitation Applicant: NEC Co., Ltd. Figure 2
Claims (1)
側に放電管付きベル回路を備えた複数個の電話機の応答
を検出する応答検出回路において１前記呼出し信号送出
側に設けられた過電流検出回路と、 呼出し信号帰線側に設けられた応答信号検出回路とによ
って構成されることを特徴とする応答検出回路。[Scope of Claims] In a response detection circuit for detecting the responses of a plurality of telephones connected in parallel between a subscriber line and the ground air and each having a bell circuit with a discharge tube on the calling signal sending side, 1 the calling signal sending A response detection circuit comprising an overcurrent detection circuit provided on the call signal return side and a response signal detection circuit provided on the call signal return line side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16871283A JPS6059848A (en) | 1983-09-13 | 1983-09-13 | Response detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16871283A JPS6059848A (en) | 1983-09-13 | 1983-09-13 | Response detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6059848A true JPS6059848A (en) | 1985-04-06 |
Family
ID=15873047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16871283A Pending JPS6059848A (en) | 1983-09-13 | 1983-09-13 | Response detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059848A (en) |
-
1983
- 1983-09-13 JP JP16871283A patent/JPS6059848A/en active Pending
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