JPH0560013U - Ring signal detection circuit - Google Patents
Ring signal detection circuitInfo
- Publication number
- JPH0560013U JPH0560013U JP229492U JP229492U JPH0560013U JP H0560013 U JPH0560013 U JP H0560013U JP 229492 U JP229492 U JP 229492U JP 229492 U JP229492 U JP 229492U JP H0560013 U JPH0560013 U JP H0560013U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- dial pulse
- output
- telephone line
- photocouplers
- 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
Landscapes
- Facsimile Transmission Control (AREA)
- Facsimiles In General (AREA)
Abstract
(57)【要約】
【目的】 ダイヤルパルスによる誤った呼出信号検出を
防止する。
【構成】 電話回線に電話機のほかに併設機器を備えた
通信装置において、電話回線からの呼出信号と併設機器
からのダイヤルパルスを極性別に検出する一対のフォト
カプラ7,8と、この一対のフォトカプラの出力から呼
出信号からダイヤルパルスを除去して取出す論理回路
9,10,11とを備え、呼出信号とダイヤルパルスの
極性の違いから呼出信号のみを取出す。
(57) [Summary] [Purpose] To prevent false call signal detection by dial pulse. [Composition] In a communication device equipped with an additional device in addition to a telephone in the telephone line, a pair of photocouplers 7 and 8 for detecting a ringing signal from the telephone line and a dial pulse from the additional device according to polarity, and this pair of photocouplers. Logic circuits 9, 10, and 11 are provided for removing dial pulses from the output of the coupler and removing the dial pulse from the output of the coupler, and only the calling signal is taken out due to the difference in the polarities of the calling signal and the dial pulse.
Description
【0001】[0001]
本考案は、電話回線の呼出信号検出回路に関する。 The present invention relates to a call signal detection circuit for a telephone line.
【0002】[0002]
最近の電話回線には電話機のほかにデータ通信のためのモデム装置やファクシ ミリが併設され、これら機器の接続切換えによって相手機器との通信回線が形成 される。 In addition to telephones, modem devices and fax machines for data communication have been installed in recent telephone lines, and by switching the connection of these devices, a communication line with the other device is formed.
【0003】 これら機器の呼出しには電話回線を通して交換機側から印加される呼出信号に よってなされ、この呼出信号検出回路は図4に示す構成にされる。A call signal applied from the exchange side through a telephone line is used to call these devices, and the call signal detection circuit has a structure shown in FIG.
【0004】 電話回線からの呼出信号は図5に波形図を示すように16HZ程度の周波数で 1秒間、その後に2秒間の休止を持つ断続信号にされる。この信号はフォトカプ ラ1によって16HZ程度のオン・オフパルス波形の呼出信号検出出力CIとし て取出される。2は電話機やモデムにされる機器であり、切換スイッチ3によっ てファクシミリ等の併設機器4が電話回線に接続される。As shown in the waveform diagram of FIG. 5, the ringing signal from the telephone line is made into an intermittent signal having a frequency of about 16 HZ for 1 second and then a rest of 2 seconds. This signal is taken out by the photocoupler 1 as a ringing signal detection output CI having an ON / OFF pulse waveform of about 16HZ. Reference numeral 2 denotes a device that is used as a telephone or a modem, and a changeover switch 3 connects an auxiliary device 4 such as a facsimile to a telephone line.
【0005】 フォトカプラ5は、併設機器4が電話回線を使用中か否かの確認信号USEを 得るもので、併設機器4の入出力電流の監視によってなされる。The photocoupler 5 obtains a confirmation signal USE indicating whether or not the auxiliary equipment 4 is using the telephone line, and is performed by monitoring the input / output current of the auxiliary equipment 4.
【0006】[0006]
電話機やモデム等の機器2から電話回線に印加するダイヤルパルス信号は図6 に示すように規定される。即ち、10HZ又は20HZの周波数成分を有して呼 出信号に近い周波数になる。また、その電圧も呼出信号に近い電圧になる。 The dial pulse signal applied to the telephone line from the device 2 such as a telephone or a modem is defined as shown in FIG. That is, it has a frequency component of 10HZ or 20HZ and becomes a frequency close to the call signal. Also, the voltage becomes a voltage close to the calling signal.
【0007】 このため、呼出信号検出用フォトカプラ1ではダイヤルパルスに応じた出力C Iをも発生してしまい、呼出信号として誤検出する恐れがあった。Therefore, the call signal detection photocoupler 1 also generates an output C I corresponding to the dial pulse, and there is a risk of false detection as a call signal.
【0008】 本考案の目的は、ダイヤルパルスによる誤った呼出信号検出を防止した検出回 路を提供することにある。An object of the present invention is to provide a detection circuit that prevents erroneous ringing signal detection due to dial pulses.
【0009】[0009]
本考案は、前記課題の解決を図るため、電話回線に電話機のほかに併設機器を 備えた通信装置において、電話回線からの呼出信号と併設機器からのダイヤルパ ルスを極性別に検出する一対のフォトカプラと、前記フォトカプラの両出力から 呼出信号からダイヤルパルスを除去して取出す論理回路とを備えたことを特徴と する。 In order to solve the above problems, the present invention provides a pair of photocouplers for detecting a ringing signal from a telephone line and a dial pulse from the auxiliary device for each polarity in a communication device having a telephone line and an additional device in addition to the telephone. And a logic circuit for removing the dial pulse from the calling signal from both outputs of the photocoupler and taking it out.
【0010】[0010]
呼出信号が正負両極性を有し、ダイヤルパルスが正又は負の一方の極性を有す ることを利用し、呼出信号とダイヤルパルスを一対のフォトカプラで極性別に検 出することで呼出信号の場合には両方のフォトカプラに出力を得、ダイヤルパル スの場合には一方のフォトカプラに出力を得、この両フォトカプラの出力態様の 違いから呼出信号からダイヤルパルスを除去して取出す。 Utilizing the fact that the ringing signal has both positive and negative polarities and the dial pulse has either positive or negative polarity, the ringing signal of the ringing signal can be detected by detecting the ringing signal and the dial pulse by polarity with a pair of photocouplers. In this case, the output is obtained from both photocouplers, and in the case of a dial pulse, the output is obtained from one photocoupler, and the dial pulse is removed from the calling signal due to the difference in the output mode of these photocouplers.
【0011】[0011]
図1は本考案の一実施例を示す回路図である。呼出信号検出回路6は、併設機 器4の電流監視(使用・不使用監視)機能も有してダイヤルパルスの誤検出防止 を行う。 FIG. 1 is a circuit diagram showing an embodiment of the present invention. The ringing signal detection circuit 6 also has a current monitoring (use / non-use monitoring) function of the side-by-side device 4 to prevent erroneous detection of dial pulses.
【0012】 フォトカプラ7及び8は、併設機器4と電話回線との接続ラインに介挿され、 夫々互いに逆極性の電流に応動した出力パルスを得る。The photocouplers 7 and 8 are inserted in the connection line between the adjoining device 4 and the telephone line, and each obtains an output pulse in response to currents of opposite polarities.
【0013】 R−Sフリップフロップ9はフォトカプラ7,8の出力をセットとリセットの 入力とし、出力端Qにセットとリセット状態の出力を得る。再トリガ型単安定マ ルチバイブレータ10は、フリップフロップ9の出力をトリガ入力とし、このト リガ入力が一定時間内に連続するときに論理“1”出力を出しつづける。The RS flip-flop 9 receives the outputs of the photocouplers 7 and 8 as inputs for setting and resetting, and obtains the output in the set and reset states at the output terminal Q. The re-trigger type monostable multivibrator 10 uses the output of the flip-flop 9 as a trigger input, and continuously outputs a logical "1" output when this trigger input continues within a fixed time.
【0014】 アンドゲート11はマルチバイブレータ10の出力をゲート入力とし、フリッ プフロップ9の出力に対するゲート制御によって呼出信号検出パルスCIを得る 。オアゲート12は、フォトカプラ7,8の出力を夫々論理和入力として出力に 併設機器使用中の監視信号USEを得る。The AND gate 11 receives the output of the multivibrator 10 as a gate input and obtains a ringing signal detection pulse CI by gate control of the output of the flip-flop 9. The OR gate 12 uses the outputs of the photocouplers 7 and 8 as OR inputs to obtain the monitoring signal USE during use of the side-by-side device.
【0015】 本実施例の動作を以下に詳細に説明する。The operation of this embodiment will be described in detail below.
【0016】 電話回線から呼出信号が入力されると、フォトカプラ7,8の入力ダイオード に電流が交互に流れ、呼出信号の周波数に応じてフォトカプラ7,8の出力トラ ンジスタが交互にオン・オフする。この交互のオン・オフ信号により、フリップ フロップ9ではセットとリセットを繰り返し、フォトカプラ7がオンのときは出 力端Qが“1”、フォトカプラ8がオンのときは“0”になる。When a ringing signal is input from the telephone line, a current alternately flows through the input diodes of the photocouplers 7 and 8, and the output transistors of the photocouplers 7 and 8 are alternately turned on according to the frequency of the ringing signal. Turn off. By this alternating on / off signal, the flip-flop 9 repeats setting and resetting, and the output end Q becomes "1" when the photocoupler 7 is on and "0" when the photocoupler 8 is on.
【0017】 このフリップフロップ9の出力の周期、即ち呼出信号の周期より長い時定数を 持つ単安定マルチバイブレータ10では、その出力が“1”を保ちつづける。こ の論理“1”状態ではアンドゲート11のゲートが開かれ、フリップフロップ9 のオン・オフ出力がそのまま呼出信号検出パルスCIとして取出される。In the monostable multivibrator 10 having a time constant longer than the cycle of the output of the flip-flop 9, that is, the cycle of the calling signal, the output thereof keeps “1”. In this logic "1" state, the gate of the AND gate 11 is opened and the ON / OFF output of the flip-flop 9 is taken out as it is as the ringing signal detection pulse CI.
【0018】 この呼出信号の検出状態は図2に示すようになり、呼出信号の始まりと終わり の極性により4つの組合せが考えられ、夫々(a)〜(d)で示す。また、時間 tはマルチバイブレータの再トリガ期間を示す。The detection state of the ringing signal is as shown in FIG. 2, and four combinations can be considered depending on the polarities of the beginning and the end of the ringing signal, which are shown by (a) to (d), respectively. Further, time t indicates the re-trigger period of the multivibrator.
【0019】 次に、併設機器4からダイヤルパルスを発信したとき、ダイヤルパルス信号は 電話回線の直流電流のオン・オフであるため、フォトカプラ7,8の何れか一方 にしか電流が流れない。これにより、フリップフロップ9はセット又はリセット 信号の何れか一方の入力になり、その出力はセット状態又はリセット状態に固定 され、単安定マルチバイブレータ10のトリガを行わない。従って、アンドゲー ト11のゲートが閉じたままになり、呼出信号CIとしての誤検出は防止される 。図3はダイヤルパルスに対する応答波形図を示し、電話回線への接続極性によ りフォトカプラ8にダイヤルパルスが発生する場合(a)とフォトカプラ7にダ イヤルパルスが発生する場合(b)とに分けて示す。Next, when a dial pulse is transmitted from the adjoining device 4, since the dial pulse signal is the on / off of the direct current of the telephone line, the current flows only to either one of the photocouplers 7 and 8. As a result, the flip-flop 9 becomes an input of either the set or reset signal, and its output is fixed to the set state or the reset state, and the monostable multivibrator 10 is not triggered. Therefore, the gate of the AND gate 11 remains closed, and erroneous detection as the calling signal CI is prevented. Fig. 3 shows the response waveform diagram for the dial pulse. In the case where the dial pulse is generated in the photocoupler 8 (a) and the dial pulse is generated in the photocoupler 7 (b) due to the connection polarity to the telephone line. Separately shown.
【0020】 併設機器4の使用・不使用状態の監視はオアゲート12によって検出信号US Eとして取出される。Monitoring of the use / non-use state of the auxiliary equipment 4 is taken out by the OR gate 12 as a detection signal US E.
【0021】 なお、実施例においてはフリップフロップ9とマルチバイブレータ10等によ って一対のフォトカプラの出力態様から呼出信号からダイヤルパルスを分離して 取出す場合を示すが、これら論理回路は他の論理回路構成に変更できるのは勿論 である。In the embodiment, the case where the dial pulse is separated and taken out from the calling signal from the output mode of the pair of photocouplers by the flip-flop 9 and the multivibrator 10 etc. is shown. Of course, it can be changed to a logic circuit configuration.
【0022】[0022]
以上のとおり、本考案によれば、電話回線からの呼出信号と併設機器からのダ イヤルパルスを極性別に一対のフォトカプラで検出し、この一対のフォトカプラ の出力態様からダイヤルパルスを除いた呼出信号検出を行うようにしたため、信 号規格が類似する呼出信号とダイヤルパルスの確実な分離を得て呼出信号の誤検 出を防止できる。また、一対のフォトカプラの出力を利用して併設機器の使用・ 不使用の監視も行うことができ、回路の簡単化を図ることができる。 As described above, according to the present invention, the ringing signal from the telephone line and the dial pulse from the adjoining device are detected by the pair of photocouplers according to their polarities, and the ringing signal excluding the dial pulse from the output mode of the pair of photocouplers. Since the detection is performed, it is possible to prevent the false detection of the calling signal by obtaining a reliable separation of the calling signal and the dial pulse having similar signal standards. In addition, the output of a pair of photo couplers can be used to monitor the use / non-use of the side-by-side equipment, and the circuit can be simplified.
【図1】本考案の一実施例を示す回路図。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図2】実施例の呼出信号検出パルス波形図。FIG. 2 is a waveform diagram of a ringing signal detection pulse according to the embodiment.
【図3】実施例のダイヤルパルスの応答波形図。FIG. 3 is a response waveform diagram of a dial pulse according to the embodiment.
【図4】従来の構成図。FIG. 4 is a conventional configuration diagram.
【図5】呼出信号波形図。FIG. 5 is a waveform diagram of a ringing signal.
【図6】ダイヤルパルス波形図。FIG. 6 is a dial pulse waveform diagram.
2…機器(電話機,モデム)、4…併設機器、6…呼出
信号検出回路、7,8…フォトカプラ、9…フリップフ
ロップ、10…再トリガ型単安定マルチバイブレータ。2 ... Equipment (telephone, modem), 4 ... Side-by-side equipment, 6 ... Ring signal detection circuit, 7, 8 ... Photo coupler, 9 ... Flip-flop, 10 ... Re-trigger type monostable multivibrator.
Claims (1)
えた通信装置において、電話回線からの呼出信号と併設
機器からのダイヤルパルスを極性別に検出する一対のフ
ォトカプラと、前記フォトカプラの両出力から呼出信号
からダイヤルパルスを除去して取出す論理回路とを備え
たことを特徴とする呼出信号検出回路。1. In a communication device having a telephone line and an additional device in addition to a telephone, both a photo coupler and a pair of photo couplers for detecting a calling signal from the telephone line and a dial pulse from the additional device according to polarity. And a logic circuit for removing a dial pulse from a calling signal and outputting the calling signal from the output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP229492U JPH0560013U (en) | 1992-01-27 | 1992-01-27 | Ring signal detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP229492U JPH0560013U (en) | 1992-01-27 | 1992-01-27 | Ring signal detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0560013U true JPH0560013U (en) | 1993-08-06 |
Family
ID=11525354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP229492U Pending JPH0560013U (en) | 1992-01-27 | 1992-01-27 | Ring signal detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0560013U (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5983450A (en) * | 1982-11-05 | 1984-05-14 | Ricoh Co Ltd | Network controller |
-
1992
- 1992-01-27 JP JP229492U patent/JPH0560013U/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5983450A (en) * | 1982-11-05 | 1984-05-14 | Ricoh Co Ltd | Network controller |
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