JPS6035866A - Emergency information device - Google Patents

Emergency information device

Info

Publication number
JPS6035866A
JPS6035866A JP14374583A JP14374583A JPS6035866A JP S6035866 A JPS6035866 A JP S6035866A JP 14374583 A JP14374583 A JP 14374583A JP 14374583 A JP14374583 A JP 14374583A JP S6035866 A JPS6035866 A JP S6035866A
Authority
JP
Japan
Prior art keywords
emergency
telephone
section
hook
message
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
Application number
JP14374583A
Other languages
Japanese (ja)
Inventor
Tadashi Tajo
田場 征
Fumio Muto
武藤 史男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP14374583A priority Critical patent/JPS6035866A/en
Publication of JPS6035866A publication Critical patent/JPS6035866A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H04M11/045Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems using recorded signals, e.g. speech

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)

Abstract

PURPOSE:To attain telephone call having a high energency function without disconnecting the calling state suddenly by sending a message to a speaker at the generation of emergency information. CONSTITUTION:If a telephone set 23 is an object to receive emergency information, telephone sets 4, 24 generate emergency information through a telephone circuit 1 in calling and a sensor in an emergency information part 17 is started, a switch 21 is closed and the 2nd voice generating part 13 is started. Since the voice generating part 13 sends the message once or plural times, the message is sent to the telephone set 4. When a speaker hooks a transmitter/receiver, a detecting element 3 detects the hooking and sends the detected result to a control part 15. The control circuit 15 sends a control signal to the emergency information part 17 and switches relay contacts 2A, 2B to inform the emergency to the terminating telephone set 23 to be informed at the emergency.

Description

【発明の詳細な説明】 (技術分野) 本発明は通話中に非常通報に切シ替え、又は非常通話中
に通話に切シ替えることのできる非常通報装置に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an emergency call device that can switch to an emergency call during a call, or switch to a call during an emergency call.

(従来技術) 第1図は従来の非常通報装置の実施例を示す説明図で、
1は通話回線、2A、2Bはリレー接点、3は検出素子
、4は電話機、5は非常通報部、6はコンデンサ、7は
発振器、8はチョークコイル、9は直流電源、10は制
御部、1ノはスイッチを示す。その動作は、電話機4を
使用中、すなわち電話回線1と電話機4が接続されてい
る場合に火災報知器等のセンサが働き非常通報部5が動
作すると、スイッチ1ノが閉じ発振器7から発報待機中
を知らせるトーンを電話機4に送出することによシ、電
話機4の使用者は非常事態を知り、その旨を相手に伝え
て送受話器を戻す。これによって(9) 電話機40オンフツクを検出素子3が検出し、制御部1
0がリレー接点2に、2Bを切替えて非常通報部5から
発報開始するものである。
(Prior art) Fig. 1 is an explanatory diagram showing an example of a conventional emergency notification device.
1 is a telephone line, 2A and 2B are relay contacts, 3 is a detection element, 4 is a telephone, 5 is an emergency reporting section, 6 is a capacitor, 7 is an oscillator, 8 is a choke coil, 9 is a DC power supply, 10 is a control section, 1 indicates a switch. Its operation is such that when the telephone 4 is in use, that is, when the telephone line 1 and the telephone 4 are connected, a sensor such as a fire alarm is activated and the emergency notification section 5 is activated, the switch 1 closes and the oscillator 7 issues an alarm. By sending a tone indicating that the telephone is on standby to the telephone 4, the user of the telephone 4 becomes aware of the emergency situation, informs the other party of the emergency, and then hangs up the handset. As a result, (9) the detection element 3 detects the on-hook of the telephone 40, and the control unit 1
0 is the relay contact 2, and 2B is switched to start the alarm from the emergency reporting section 5.

又、第1図に示すものの外、従来における非常通報装置
においては、非常通報装置からの発報は通話が終るまで
待つとか、非常通報部の動作によシ突然通話を切断して
非常通報を行なうというものが従来の非常通報装置であ
った。
Furthermore, in addition to what is shown in Figure 1, conventional emergency reporting devices either wait until the end of the call to issue an alarm from the emergency reporting device, or suddenly disconnect the call due to the operation of the emergency reporting section and issue an emergency call. Conventional emergency notification devices were designed to do this.

このような従来実施例における非常通報装置においては
次に述べるような欠点があった。
The emergency notification device in the conventional example has the following drawbacks.

(1)突然切断された場合は通話中の両者に不便である
とともに、不安を与えることとなる。
(1) If the call is suddenly disconnected, it will be inconvenient and anxiety-inducing for both parties during the call.

(2) 発報待機中を知らせるトーンが発信されて送受
話器を戻した場合、非常通報発報中は電話機を使用する
ことができず、緊急性の高い通話の必要性が発生しても
待たなければならない。
(2) If you put the handset back on after receiving a tone indicating that the emergency call is on standby, you will not be able to use the phone while the emergency call is being issued, and you will not be able to wait even if you need to make an emergency call. There must be.

(3)電話機4がオンフック(電話機を使用してい身い
)状態で非常通報が発報した場合、リレー接点2A、2
Bが切替っているため、その間は電話機4が使用できず
不便であり、故障等の不安を抱かせる欠点があった。
(3) If an emergency call is issued while the telephone 4 is on-hook (the telephone is not in use), relay contacts 2A, 2
Since the telephone number B is switched, the telephone 4 cannot be used during that time, which is inconvenient and has the disadvantage of causing anxiety about malfunctions and the like.

(発明の目的) 本発明の目的はこれらの欠点を除去し、話中状態を突如
切断したりすることなく、更に緊急性の高い電話通話を
可能とした非常通報装置を提供するものである。
(Object of the Invention) An object of the present invention is to eliminate these drawbacks and provide an emergency call device that enables more urgent telephone calls without abruptly cutting off a busy call.

(発明の構成) 本発明は、接続される電話機のオンフック・オフフック
を検出する検出素子と、自動ダイヤル機能と回線の極性
検出機能とメツセージ送出機能とセンサー機能とを有す
る非常通報部と、回線に接続され前記接続される電話機
と前記非常通報部との切換えを行々うリレー等の切換え
手段と、複数の種類のメツセージを送出する音声発生部
と、前記検出素子の状態を記憶する記憶手段と、前記検
出素子の出力を受け前記リレー接点の切換えと前記非常
通報部の起動と前記音声発生部に前記検出状態に応じて
各々対応するメツセージの送出の指示をなすとともに装
置全体を制御する制御部とから構成され、前記接続され
る電話機の話中に非常通報発報するに際して話者に事態
発生につきオンフックすべき旨のメツセージを送出する
とともに、非常通話中においても電話機をオフフックす
ることによって緊急使用が可能であることを特徴とする
非常通報装置である。以下本発明の一実施例を図面によ
シ詳細に説明する。
(Structure of the Invention) The present invention includes a detection element for detecting on-hook/off-hook of a connected telephone, an emergency reporting section having an automatic dialing function, a line polarity detection function, a message sending function, and a sensor function, a switching means such as a relay that is connected and switches between the connected telephone and the emergency reporting section; a voice generating section that sends out a plurality of types of messages; and a storage means that stores the state of the detection element. , a control unit that receives the output of the detection element and instructs the relay contact to switch, activates the emergency call unit, and sends the corresponding message to the voice generating unit according to the detection state, and controls the entire device; When an emergency call is issued while the connected telephone is busy, it sends a message to the speaker that they should go on-hook due to the occurrence of an emergency call, and also allows the telephone to be used off-hook even during an emergency call. This is an emergency notification device that is capable of An embodiment of the present invention will be described in detail below with reference to the drawings.

(実施例) 第2図は本発明に係る非常通報装置の一実施例を説明す
るだめのブロック図であシ、1は電話回線1.?A、、
?Bはリレー接点、4,23.24は電話機、3は例え
ばリレー、フォトカプラ等で構成され電話機4のオンフ
ック、オフフック状態を検出する検出素子、8は交流阻
止チョークコイル、9は直流電源、12は第1の音声発
生部、13は第2の音声発生部、14は第3の音声発生
部、15は制御部、16は記憶部、17は自動ダイヤル
装置、極性検出回路、メツセージ送出部、センサ等から
構成され例えば火災発生をセンサが読みとれば必要とす
る相手先へメツセージを自動的に発報する非常通報部、
18*20e25は直流阻止コ(5) ンデンサ、19.21はスイッチ、22は交換機である
。図中一点破線で囲んだ部分が非常通報装置である。
(Embodiment) FIG. 2 is a block diagram for explaining an embodiment of the emergency notification device according to the present invention, and 1 is a telephone line 1. ? A...
? B is a relay contact, 4, 23, 24 is a telephone, 3 is a detection element that is composed of, for example, a relay, a photocoupler, etc. and detects the on-hook or off-hook state of the telephone 4, 8 is an AC blocking choke coil, 9 is a DC power supply, 12 1 is a first voice generating section, 13 is a second voice generating section, 14 is a third voice generating section, 15 is a control section, 16 is a storage section, 17 is an automatic dialing device, a polarity detection circuit, a message sending section, an emergency notification section that is composed of sensors and the like, and automatically sends a message to the necessary party if the sensor reads that a fire has occurred;
18*20e25 is a DC blocking capacitor (5), 19.21 is a switch, and 22 is an exchange. The part surrounded by a dotted line in the figure is the emergency notification device.

まず電話機23が非常通報される相手とし、電話機4と
電話機24とが電話回線1を介して通話中である時に非
常通報が発生した場合について説明する。この場合、電
話機4は検出素子3−リレー接点2B −IJシレ一点
2A−電話回線1−交換機22−電話機24のループで
接続され、通話中となっている。この状態で非常通報部
17のセンサが起動した場合、非常通報部17はスイッ
チ21を閉成し、第2の音声発生部13に起動をかける
First, a case will be described in which the telephone 23 is the party to whom the emergency call is made, and an emergency call occurs while the telephone 4 and the telephone 24 are talking through the telephone line 1. In this case, the telephone 4 is connected in a loop of the detection element 3, the relay contact 2B, the IJ switch 2A, the telephone line 1, the exchange 22, and the telephone 24, and is in the middle of a call. When the sensor of the emergency notification unit 17 is activated in this state, the emergency notification unit 17 closes the switch 21 and activates the second sound generation unit 13.

第2の音声発生部13は、例えば「異常が発生しました
。ただちに通話を終了して下さい」と−回着くは複数回
メツセージを送出する。このメツセージはコンデンサ2
0を経由して電話機に送出さ 。
The second voice generating unit 13 transmits a message multiple times, for example, "An abnormality has occurred. Please end the call immediately." This message is capacitor 2
0 to the telephone.

れることにより話中者は送受話器を戻す。その結果、電
話回線1よシ検出素子3を経由して電話機4に流れてい
た直流電流が断たれ、検出素子3がこれを検出して制御
部15に送出する。制御部(6) l5は非常通報部17に制御信号を送出するとともに、
リレー接点2に、2Bを切替える。その結果、非常通報
部17は電話回線1と接続され、第1の音声発生部12
が電話機4と接続される。そして非常通報部17が動作
して非常通報すべき相手(電話機23)に通報する。
The person on the line returns the handset. As a result, the direct current flowing through the telephone line 1 to the telephone set 4 via the detection element 3 is cut off, and the detection element 3 detects this and sends it to the control section 15. The control unit (6) l5 sends a control signal to the emergency notification unit 17, and
Switch 2B to relay contact 2. As a result, the emergency report section 17 is connected to the telephone line 1, and the first voice generating section 12
is connected to telephone 4. Then, the emergency reporting unit 17 operates to notify the other party (telephone 23) to which the emergency call should be made.

第3図は非常通報部17のブロック図を示し、26は自
動ダイヤル送出部、27は音声発生部、28は非常通報
部制御部、29は極性検出回路、30はセンサである。
FIG. 3 shows a block diagram of the emergency notification section 17, in which 26 is an automatic dial sending section, 27 is a voice generation section, 28 is an emergency notification section control section, 29 is a polarity detection circuit, and 30 is a sensor.

センサ30が起動した場合、前述の動作が行われてリレ
ー接点2Aが切換えられ、非常通報部17が電話回線1
と接続すると、まず自動タゝイヤル送出部26が非常通
報すべき相手先(第2図の電話機23)の番号をタ8イ
ヤル送出して呼び出す。相手が送受話器をオフフックし
たことによシミ話回線1の極性が変化することから極性
検出回路29がこれを検出し、非常通報部制御部28が
音声発生部27を動作させて所定の非常通報すべき音声
データを送出する。
When the sensor 30 is activated, the above-mentioned operation is performed, the relay contact 2A is switched, and the emergency report section 17 is connected to the telephone line 1.
When connected, the automatic dial sending unit 26 first sends out and calls the number of the destination (telephone 23 in FIG. 2) to which an emergency call is to be made. When the other party goes off-hook, the polarity of the telephone line 1 changes, so the polarity detection circuit 29 detects this, and the emergency call control unit 28 operates the voice generator 27 to issue a predetermined emergency call. Send the desired audio data.

又非常通報中、第2図において電話機4は検出素子3−
リレー接点2B−コンデンサ25−第1の音声発生部1
2と、ならびに検出素子3−リレー接点2B−交流l!
[1止チョークコイル8−直流電源9と接続されている
。従って、この状態の時に電話機4をオフフックして通
話しようとした場合、直流電流が電話機4に供給され、
検出素子3の出力は「ON」 となり制御部15から第
1の音声発生装置12へ起動信号が送出され、第1の音
声発生部12から、例えば「異常が発生しました。回線
を使用中です。送受話器を戻して下さい。」と1回又は
複数回メツセージを送出することによシ、電話機4の操
作者は使用できないことを知る。そこで、送受話器を戻
すことによシ検出素子3の出力はrOFFJとなり、第
1の音声発生装置12は音声出力を停止する。従って、
電話機4の扱者は従来のように無音で使用できないとい
うような不安。
Also, during an emergency call, the telephone 4 in Fig. 2 detects the detection element 3-
Relay contact 2B-capacitor 25-first audio generator 1
2, as well as detection element 3-relay contact 2B-AC l!
[1-stop choke coil 8 - connected to DC power supply 9. Therefore, if you try to make a call by taking the telephone 4 off-hook in this state, direct current is supplied to the telephone 4,
The output of the detection element 3 becomes "ON" and a start signal is sent from the control section 15 to the first sound generation device 12, and the first sound generation section 12 outputs, for example, "An abnormality has occurred. The line is in use. .Please put the handset back.'' By sending the message one or more times, the operator of the telephone 4 knows that it cannot be used. Therefore, by putting the handset back on, the output of the detection element 3 becomes rOFFJ, and the first sound generating device 12 stops outputting sound. Therefore,
The operator of Telephone 4 is concerned about not being able to use it silently like before.

不要が除去されることになる。Unnecessary items will be removed.

次に電話機4が使用されてい々い場合の動作について説
明する。非常通報装置17が動作していない状態におい
て、リレー接点2A、2Bは第2図に示す状態にある。
Next, the operation when the telephone 4 is in use will be explained. When the emergency notification device 17 is not operating, the relay contacts 2A and 2B are in the state shown in FIG. 2.

この状態において、非常通報部17のセンサ30が動作
した場合、制御部15はリレー接点2に、2Bを切換え
て非常通報部17と電話回線1を接続し、非常通報の発
報を行なう。非常通報部17からの発報動作は前述と同
じであシ、非常通報すべき電話機23を呼び出して非常
通報する。非常通報部17の動作は所定の回数メツセー
ジを送出した後着くは一定時間メッセージを送出した後
終了する。
In this state, when the sensor 30 of the emergency notification unit 17 is activated, the control unit 15 switches the relay contact 2B to connect the emergency notification unit 17 and the telephone line 1, and issues an emergency notification. The alarm operation from the emergency reporting unit 17 is the same as described above, and calls the telephone 23 to which the emergency call should be made to make the emergency call. The operation of the emergency report section 17 ends after sending the message a predetermined number of times, and after sending the message for a certain period of time.

次に、非常通報発報中に電話機4にて緊急に通話する必
要が発生した場合について説明する。リレー接点2に、
2Bがメーク、ブレークどちらの状態にあっても、電話
回線および直流電源9によジオンフック/オフフック情
報は検出素子3によって検出される。従って、電話機4
のオンフック。
Next, a case will be described in which it is necessary to make an emergency call using the telephone 4 while an emergency call is being issued. To relay contact 2,
Regardless of whether 2B is in the make or break state, the detection element 3 detects the on-hook/off-hook information from the telephone line and the DC power supply 9. Therefore, telephone 4
on the hook.

オフフックの状態ならびに発報状態を記憶部16に記憶
しておくことによシ、各々の状態変化を検出することが
でき、その状態変化によシ非常通報を中止し、電話機4
からの通話を可能とすることができる。例えば、非常通
報中の状態にある時、(9) その後の電話機40オンフツクからオフフックの変化に
より、制御部15がスイッチ19を動作させ第3の音声
発生装置14から「発報を中止します」と−回もしくは
複数回メツセージを送出することにより、非常通報を受
けている電話機23の話者は発報中止を知る。その後、
リレー接点2A。
By storing the off-hook state and the alarm state in the storage unit 16, it is possible to detect changes in each state.
It is possible to make calls from. For example, when an emergency call is in progress, (9) the subsequent change from on-hook to off-hook on the telephone 40 causes the control unit 15 to operate the switch 19 and cause the third voice generator 14 to issue a message saying "stop issuing the alarm". By sending the message ``-'' or multiple times, the speaker of the telephone 23 receiving the emergency call will know that the call has been discontinued. after that,
Relay contact 2A.

2Bを制御部15が電話機側(第2図に示す状態)に戻
すことにより、電話機4は通話を行なうことができるこ
ととなる。
2B is returned to the telephone side (the state shown in FIG. 2) by the control section 15, so that the telephone 4 can make a telephone call.

本実施例における非常通報装置においては種々の音声発
生部を別々のものとして実施した場合について説明した
が、複数の種類のメツセージを送出できる機能を有する
1つの音声発生部を用いることによっても実現できる。
In the emergency notification device in this embodiment, a case has been described in which the various sound generating sections are implemented as separate units, but it can also be realized by using one sound generating section that has the function of sending out multiple types of messages. .

(発明の効果) 以上詳細に説明したように、本発明による非常通報装置
においては、非常通報発報によシ突然、話中の回線を切
断することがないため通話者に不安を与えることか々く
、又発報中において電話機が使用できないという不便さ
もない。更に、オン(10) フック状態(電話機を使用していない状態)において非
常通報部が動作を開始した場合において、これら話器の
使用開始にあたってメツセージによりその電話機が非常
通報中につき使用できない旨を知ることができるととも
に、緊急時の使用を可能とする等の効果がある。
(Effects of the Invention) As explained in detail above, in the emergency call device according to the present invention, the caller does not feel anxious because the line that is currently being used is not suddenly disconnected when an emergency call is issued. Moreover, there is no inconvenience of not being able to use the telephone while an alarm is being issued. Furthermore, when the emergency call unit starts operating in the ON (10) hook state (the state in which the telephone is not in use), when starting to use these handsets, a message informs the user that the telephone is in the emergency call state and cannot be used. It also has the effect of enabling use in emergencies.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来の非常通報装置の実施例を示す説明図、第
2図は本発明非常通報装置の一実施例を説明するための
ブロック図、第3図は非常通報部のブロック図である。 1・・・電話回線、2A、2B・・・リレー接点、4゜
23.24・・・電話機、3・・・検出素子、8・・・
交流阻止チョークコイル、9・・・直流電源、12・・
・第1の音声発生部、13・・・第2の音声発生部、1
4・・・第3の音声発生部、15・・・制御部、16・
・・記憶部、12・・・非常通報部、19.21・・・
スイッチ、22・・・交換機、26・・・自動ダイヤル
送出部、27・・・音声発生部、28・・・非常通報部
制御部、29・・・極性検出回路、30・・・センサ。 (11)
Fig. 1 is an explanatory diagram showing an embodiment of a conventional emergency notification device, Fig. 2 is a block diagram for explaining an embodiment of the emergency notification device of the present invention, and Fig. 3 is a block diagram of an emergency notification section. . 1...Telephone line, 2A, 2B...Relay contact, 4゜23.24...Telephone, 3...Detection element, 8...
AC blocking choke coil, 9...DC power supply, 12...
・First sound generation section, 13...Second sound generation section, 1
4...Third sound generation unit, 15...Control unit, 16.
...Storage section, 12...Emergency report section, 19.21...
Switch, 22...Exchange machine, 26...Automatic dial sending section, 27...Speech generation section, 28...Emergency notification section control section, 29...Polarity detection circuit, 30...Sensor. (11)

Claims (1)

【特許請求の範囲】 接続される電話機のオンフック・オフフックを検出する
検出素子と、自動ダイヤル機能と回線の極性検出機能と
メツセージ送出機能とセンサー機能とを有する非常通報
部と、回線に接続され前記接続される電話機と前記非常
通報部との切換えを行なうリレー等の切換え手段と、複
数の種類のメツセージを送出する音声発生部と、前記検
出素子の状態を記憶する記憶手段と、前記検出素子の出
力を受け前記リレー接点の切換えと前記非常通報部の起
動と前記音声発生部に前記検出状態に応じじて各々対応
するメツセージの送出の指示をなすとともに装置全体を
制御する制御部とから構成され、前記接続される電話機
の話中に非常通報発報するに際して話者に事態発生につ
きオンフックすべき旨のメツセージを送出するとともに
、非常通報中においても電話機をオフフックすることに
よ(1) って緊急使用が可能であることを特徴とする非常通報装
置。
[Claims] A detection element for detecting on-hook/off-hook of a connected telephone; an emergency reporting unit having an automatic dialing function, a line polarity detection function, a message sending function, and a sensor function; a switching means such as a relay for switching between a connected telephone and the emergency call section; a voice generating section for sending out a plurality of types of messages; a storage means for storing the state of the detection element; The apparatus is comprised of a control section which receives the output, switches the relay contacts, activates the emergency report section, instructs the sound generating section to send corresponding messages according to the detection state, and controls the entire device. , when making an emergency call while the connected telephone is busy, it sends a message to the speaker to the effect that they should go on-hook due to the occurrence of a situation, and also by taking the telephone off-hook even during the emergency call (1). An emergency notification device characterized by its ability to be used in an emergency.
JP14374583A 1983-08-08 1983-08-08 Emergency information device Pending JPS6035866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14374583A JPS6035866A (en) 1983-08-08 1983-08-08 Emergency information device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14374583A JPS6035866A (en) 1983-08-08 1983-08-08 Emergency information device

Publications (1)

Publication Number Publication Date
JPS6035866A true JPS6035866A (en) 1985-02-23

Family

ID=15346025

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14374583A Pending JPS6035866A (en) 1983-08-08 1983-08-08 Emergency information device

Country Status (1)

Country Link
JP (1) JPS6035866A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6439163A (en) * 1987-08-04 1989-02-09 Sharp Kk Automatic informing equipment employing telephone line
JPH02141038A (en) * 1988-11-21 1990-05-30 Fujitsu Ltd Multimedia multiplexer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6439163A (en) * 1987-08-04 1989-02-09 Sharp Kk Automatic informing equipment employing telephone line
JPH02141038A (en) * 1988-11-21 1990-05-30 Fujitsu Ltd Multimedia multiplexer

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