JPH07184183A - Multi-point video conference system - Google Patents
Multi-point video conference systemInfo
- Publication number
- JPH07184183A JPH07184183A JP5328685A JP32868593A JPH07184183A JP H07184183 A JPH07184183 A JP H07184183A JP 5328685 A JP5328685 A JP 5328685A JP 32868593 A JP32868593 A JP 32868593A JP H07184183 A JPH07184183 A JP H07184183A
- Authority
- JP
- Japan
- Prior art keywords
- conference
- video conference
- multipoint
- control unit
- line
- 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.)
- Granted
Links
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、テレビ会議におけるテ
レビ会議端末側から多地点テレビ会議制御装置に対して
会議の開催／終了を指示する制御に利用する。本発明
は、外部機器を用いることなく安価にシステムを構成す
ることができる多地点テレビ会議システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for control for instructing a multipoint video conference control device to hold / end a conference from a video conference terminal side in a video conference. TECHNICAL FIELD The present invention relates to a multipoint video conference system capable of inexpensively constructing a system without using an external device.
【０００２】[0002]
【従来の技術】従来この種のテレビ会議システムは、図
２に示すように、会議を開催する際は多地点テレビ会議
制御装置１１に接続された会議予約制御装置１５から、
あるいはテレビ会議端末２側からアナログ回線１３やＩ
ＳＤＮ回線（ＤチャネルパケットまたはＢチャネル）１
４などを使用して会議開催情報を多地点テレビ会議制御
装置１１へ送り、回線の接続を行っていた。2. Description of the Related Art Conventionally, a video conference system of this type, as shown in FIG. 2, is provided from a conference reservation control device 15 connected to a multipoint video conference control device 11 when a conference is held.
Alternatively, from the video conference terminal 2 side, the analog line 13 or I
SDN line (D channel packet or B channel) 1
4 was used to send the conference information to the multipoint video conference control device 11 to connect the line.
【０００３】また、ＩＳＤＮ回線を用いる通信におい
て、その呼設定メッセージのユーザ・ユーザ情報要素に
制御情報を付加する技術も存在する（特開平３−１０５
６７、特開平３−９７３５３））。しかし、これらの技
術は、多地点でのテレビ会議を運行するに必要な制御情
報を伝送する技術ではなく、単にＩＳＤＮ回線を用いる
１対１通信における画像伝送技術での制御情報の伝送に
ユーザ・ユーザ情報要素を用いる例に過ぎないため、多
地点でのテレビ会議の開催および終了の制御を示唆する
ものではない。There is also a technique for adding control information to the user / user information element of the call setting message in the communication using the ISDN line (Japanese Patent Laid-Open No. 3-105).
67, JP-A-3-97353)). However, these technologies are not technologies for transmitting control information necessary for operating a video conference at multiple points, but are simply used for transmitting control information by image transmission technology in one-to-one communication using ISDN lines. It is merely an example using the user information element, and does not imply control of holding and ending a video conference at multiple points.
【０００４】[0004]
【発明が解決しようとする課題】このような従来のテレ
ビ会議システムは、会議開催の指示を端末側から行う場
合、多地点テレビ会議制御装置側に端末からの指示を受
信するための回線、モデムなどの外部機器を別途必要と
するために、コストが増加する欠点がある。例えば、ア
ナログ回線を使用する場合には、図２に示す映像／音声
とは別のアナログ回線１３およびモデム１２が必要とな
る。またＩＳＤＮのＤチャネルパケットを使用する場合
には、そのためのターミナルアダプタ１７などのハード
ウェアや回線の契約などが必要となる。また、会議予約
制御装置１５を使用する場合も会議予約端末１６との間
で専用の回線が必要となる。In such a conventional video conference system, when a command for holding a conference is given from the terminal side, a line and a modem for receiving the instruction from the terminal to the multipoint video conference control device side. Since there is a need for an external device such as the above, there is a drawback that the cost increases. For example, when using an analog line, an analog line 13 and a modem 12 different from the video / audio shown in FIG. 2 are required. Further, when the D channel packet of ISDN is used, the hardware such as the terminal adapter 17 for that purpose and the contract of the line are required. Also, when using the conference reservation control device 15, a dedicated line with the conference reservation terminal 16 is required.
【０００５】ＩＳＤＮのＢチャネルを使用し、映像／音
声に多重化して制御データを転送する場合もあるが、こ
の場合、多重化された信号から制御データを取り出すハ
ードウェアが必要となる。さらに、多地点会議のように
映像／音声を一度分離して処理を行う場合は制御データ
を分離することができるが、１対１接続や放送型接続の
ような回線交換接続の場合は多重されたデータは分離さ
れずにそのまま交換されるので、制御データを分離でき
ない欠点がある。In some cases, the control data is transferred by being multiplexed with video / audio using the B channel of ISDN, but in this case, hardware for extracting the control data from the multiplexed signal is required. Furthermore, control data can be separated when video / audio is separated and processed once as in a multipoint conference, but is multiplexed in the case of circuit-switched connection such as one-to-one connection or broadcast type connection. However, the control data cannot be separated because the data is exchanged as it is without being separated.
【０００６】本発明はこのような背景のもとに行われた
ものであって、外部機器を用いることなく多地点会議の
設定を行なえるようにし、設備に要するコストを低減す
ることができる多地点テレビ会議システムを提供するこ
とを目的とする。The present invention has been made under such a background, and it is possible to set up a multipoint conference without using an external device and to reduce the cost required for equipment. The purpose is to provide a point video conference system.
【０００７】[0007]
【課題を解決するための手段】本発明は、遠隔地に存在
する複数のテレビ会議端末と、このテレビ会議端末とＩ
ＳＤＮ回線を介して接続され設定された会議形態に合わ
せた回線接続を含むテレビ会議の制御を行う多地点テレ
ビ会議制御装置とを備えたテレビ会議システムにおい
て、前記テレビ会議端末は、会議形態および会議参加端
末数を含む会議開催情報をＩＳＤＮの呼設定メッセージ
内のユーザ・ユーザ情報要素に設定して前記多地点テレ
ビ会議制御装置に発呼し会議の開催を指示する手段を備
え、前記多地点テレビ会議制御装置は、前記テレビ会議
端末からの呼設定メッセージ内のユーザ・ユーザ情報要
素から前記会議開催情報を分離するＩＳＤＮ回線制御部
と、前記会議形態情報に基づいて、必要な回線を接続す
る回線交換部と、伝送される画像および音声データを分
離して、会議に必要な音声の加算ならびに画像の切替制
御を行う多地点会議制御部と、前記ＩＳＤＮ回線制御部
および前記回線制御部ならびに前記多地点会議制御部を
制御する中央制御部とを備えたことを特徴とする。SUMMARY OF THE INVENTION The present invention is directed to a plurality of video conference terminals existing at remote locations, and the video conference terminals and I.
In a video conference system provided with a multipoint video conference control device for controlling a video conference including a line connection adapted to a conference mode set by being connected through an SDN line, the video conference terminal comprises a conference mode and a conference. The multipoint television is provided with means for setting conference holding information including the number of participating terminals in a user / user information element in a call setting message of ISDN and calling the multipoint videoconference control device to instruct the holding of the conference. The conference control device includes an ISDN line control unit that separates the conference holding information from a user / user information element in a call setting message from the video conference terminal, and a line that connects a necessary line based on the conference type information. Multipoint conference that separates the exchange part and transmitted image and audio data, and adds the audio necessary for the conference and controls the switching of images And control unit, characterized by comprising a central control unit which controls the ISDN line control unit and the line control unit and the multipoint conference controller.
【０００８】前記中央制御部は、前記ＩＳＤＮ回線制御
部からの会議開催情報をもとに会議形態を判断し前記Ｉ
ＳＤＮ回線制御部による他のテレビ会議端末への発呼制
御および前記回線交換部に対する必要な回線接続制御な
らびに前記多地点会議制御部での多地点会議の運用管理
を制御する手段を含み、前記テレビ会議端末は、会議終
了情報をＩＳＤＮの切断メッセージ内のユーザ・ユーザ
情報要素に設定して前記多地点テレビ会議制御装置へ指
示する手段を含み、前記多地点テレビ会議制御装置は、
このテレビ会議端末からの切断メッセージ内のユーザ・
ユーザ情報要素内の会議終了情報に基づいて、他のテレ
ビ会議端末への切断を行う手段を含むことが望ましい。The central control unit judges the conference form based on the conference holding information from the ISDN line control unit and determines the I
The television set includes means for controlling calling control to another video conference terminal by the SDN line control unit, necessary line connection control for the circuit switching unit, and operation management of the multipoint conference by the multipoint conference control unit. The conference terminal includes means for setting conference end information in a user-user information element in a disconnection message of ISDN to instruct the multipoint videoconference control device, and the multipoint videoconference control device,
The user in the disconnect message from this video conference terminal
It is desirable to include means for disconnecting to another video conference terminal based on the conference end information in the user information element.
【０００９】[0009]
【作用】会議を開催するときは、テレビ端末から着信許
可状態で待機している多地点テレビ会議制御装置に対し
てＩＳＤＮ回線を使用して発呼する。このとき、多地点
テレビ会議制御装置への接続設定を行う場合は、多地点
テレビ会議制御装置に対して接続する回線の指定、他の
参加端末への発呼のための電話番号などを含む会議開催
情報をＩＳＤＮの呼設定メッセージ内に含まれるユーザ
・ユーザ情報要素に設定して発呼する。多地点テレビ会
議制御装置では、呼設定メッセージ内のユーザ・ユーザ
情報要素から会議開催情報を取り出し、必要な回線接続
動作を行った後に、応答メッセージを端末側に返して呼
を接続する。また、会議開始設定情報に他端末への発呼
情報が含まれる場合は、他の参加端末への発呼を自動的
に行う。ユーザ・ユーザ情報要素に何も設定されていな
い場合は多地点テレビ会議制御装置への設定は行わな
い。When the conference is held, the ISDN line is used to make a call from the television terminal to the multipoint television conference control device which is on standby in the incoming permission state. At this time, when setting the connection to the multipoint video conference control device, the conference including the line to be connected to the multipoint video conference control device, the telephone number for calling other participating terminals, etc. The holding information is set in the user-user information element included in the ISDN call setup message to make a call. In the multipoint video conference control device, conference holding information is extracted from the user / user information element in the call setting message, and after performing the necessary line connection operation, the response message is returned to the terminal side to connect the call. If the conference start setting information includes call information to another terminal, the call to another participating terminal is automatically made. If nothing is set in the user / user information element, no setting is made in the multipoint video conference control device.
【００１０】会議を終了するときは、テレビ会議端末
は、開催時と同様に会議終了情報をＩＳＤＮの切断メッ
セージ内のユーザ・ユーザ情報要素に設定して呼を切断
する。会議終了情報を受けた多地点テレビ会議制御装置
は会議設定を解除し、必要ならば他のテレビ会議端末へ
の呼を切断する。When ending the conference, the video conference terminal sets the conference end information in the user-user information element in the disconnection message of the ISDN and disconnects the call, as in the case of holding the conference. Upon receiving the conference end information, the multipoint video conference control device cancels the conference setting and disconnects a call to another video conference terminal if necessary.
【００１１】テレビ会議端末からの会議開催、終了の指
示は映像および音声ともに同一の回線で行われるので、
外部機器が不要となり、設備費を低減することができ、
また、ＩＳＤＮのユーザ・ユーザ情報要素を使用するの
で、会議の設定を１対１接続、放送型接続、他地点接続
などの会議形態に制約されることなく行うことができ
る。Since instructions for holding and ending a conference from the video conference terminal are given on the same line for both video and audio,
No external equipment is needed, and equipment costs can be reduced.
Moreover, since the user / user information element of ISDN is used, the setting of the conference can be performed without being restricted by the conference mode such as the one-to-one connection, the broadcast type connection, and the remote point connection.
【００１２】[0012]
【実施例】次に、本発明実施例を図面に基づいて説明す
る。図１は本発明実施例の構成を示すブロック図であ
る。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.
【００１３】本発明実施例は、遠隔地に存在する複数の
テレビ会議端末２と、このテレビ会議端末２とＩＳＤＮ
回線３を介して接続され設定された会議形態に合わせた
回線接続を含むテレビ会議の制御を行う多地点テレビ会
議制御装置１とを備え、テレビ会議端末２は、会議形態
および会議参加端末数を含む会議開催情報をＩＳＤＮの
呼設定メッセージ内のユーザ・ユーザ情報要素に設定し
て前記多地点テレビ会議制御装置に発呼し会議の開催を
指示する手段を備え、多地点テレビ会議制御装置１は、
テレビ会議端末２からの呼設定メッセージ内のユーザ・
ユーザ情報要素から会議開催情報を分離するＩＳＤＮ回
線制御部１−１と、会議形態情報に基づいて、必要な回
線を接続する回線交換部１−２と、伝送される画像およ
び音声データを分離して、会議に必要な音声の加算なら
びに画像の切替制御を行う多地点会議制御部１−３と、
ＩＳＤＮ回線制御部１−１および回線交換部１−２なら
びに多地点会議制御部１−３を制御する中央制御部１−
４とを備える。In the embodiment of the present invention, a plurality of teleconferencing terminals 2 existing at a remote place, the teleconferencing terminals 2 and ISDN.
The multi-point video conference control device 1 for controlling the video conference including the line connection according to the conference mode which is connected through the line 3 and the video conference terminal 2 determines the conference mode and the number of conference participants. The multipoint video conference control device 1 is provided with means for setting the conference holding information including the information in the user / user information element in the call setting message of ISDN to call the multipoint video conference control device to instruct the holding of the conference. ,
The user in the call setup message from the video conference terminal 2
The ISDN line control unit 1-1 that separates the conference information from the user information element, the line switching unit 1-2 that connects the necessary lines, and the image and voice data that is transmitted are separated based on the conference form information. A multipoint conference control unit 1-3 that performs addition of voices necessary for conference and switching control of images,
Central control unit 1 for controlling the ISDN line control unit 1-1, the line switching unit 1-2, and the multipoint conference control unit 1-3.
4 and.
【００１４】中央制御部１−４は、ＩＳＤＮ回線制御部
１−１からの会議開催情報をもとに会議形態を判断し、
ＩＳＤＮ回線制御部１−１による他のテレビ会議端末２
への発呼制御および回線交換部１−２に対する必要な回
線接続制御ならびに多地点会議制御部１−３での多地点
会議の運用管理を制御する手段を含み、テレビ会議端末
２は、会議終了情報をＩＳＤＮの切断メッセージ内のユ
ーザ・ユーザ情報要素に設定して多地点テレビ会議制御
装置１へ指示する手段を含み、多地点テレビ会議制御装
置１は、このテレビ会議端末２からの切断メッセージ内
のユーザ・ユーザ情報要素内の会議終了情報に基づい
て、他のテレビ会議端末２への切断を行う手段を含む。The central control unit 1-4 judges the conference form based on the conference holding information from the ISDN line control unit 1-1,
Other video conference terminal 2 by ISDN line controller 1-1
The video conferencing terminal 2 includes means for controlling call origination to the telephone, necessary line connection control for the circuit switching unit 1-2, and operation management of the multipoint conference in the multipoint conference control unit 1-3. The multipoint videoconference control device 1 includes means for setting information to the user / user information element in the disconnection message of the ISDN and instructing the multipoint videoconference control device 1. Means for disconnecting to another video conference terminal 2 based on the conference end information in the user-user information element of.
【００１５】次に、このように構成された本発明実施例
の動作について図面を参照して説明する。Next, the operation of the embodiment of the present invention thus constructed will be described with reference to the drawings.
【００１６】会議を開催する場合、まずテレビ会議端末
２からＩＳＤＮ回線３を使用して多地点テレビ会議制御
装置１に発呼する。その場合、会議形態や会議参加端末
数などの会議開催情報をＩＳＤＮの呼設定メッセージ内
のユーザ・ユーザ情報要素に設定しておく。テレビ会議
端末２からの着呼を受けた多地点テレビ会議制御装置１
はまずＩＳＤＮ回線制御部１−１で呼設定メッセージ内
のユーザ・ユーザ情報要素の中から会議開催情報を取り
出し中央制御部１−４へ通知する。中央制御部１−４は
会議形態や接続回線数を判断して、回線交換部１−２で
必要な回線数を接続するとともに他の端末への発呼が必
要な場合は、ＩＳＤＮ回線制御部１−１に対して発呼処
理を行うように指示する。会議形態が１対１会議や放送
型会議の場合は、回線交換部１−２で回線を接続するの
みでよいが、多地点会議を開催する場合は多地点会議制
御部１−３により画像・音声の分離、画像の切替、音声
の加算処理を行わせる。When a conference is held, first, the video conference terminal 2 uses the ISDN line 3 to call the multipoint video conference control device 1. In that case, the conference holding information such as the conference type and the number of terminals participating in the conference is set in the user / user information element in the call setting message of ISDN. Multipoint video conference control device 1 receiving an incoming call from the video conference terminal 2
First, the ISDN line control unit 1-1 extracts the conference holding information from the user / user information elements in the call setting message and notifies the central control unit 1-4 of the information. The central control unit 1-4 determines the conference type and the number of connected lines, and if the line switching unit 1-2 connects the required number of lines and calls to another terminal, the ISDN line control unit Instruct 1-1 to perform call processing. When the conference type is a one-to-one conference or a broadcast type conference, it is only necessary to connect the lines by the circuit switching unit 1-2, but when holding a multipoint conference, the multipoint conference control unit 1-3 is used to Performs voice separation, image switching, and voice addition processing.
【００１７】会議の終了の場合も、開催時と同様にテレ
ビ会議端末２からＩＳＤＮの切断メッセージ内のユーザ
・ユーザ情報要素に会議終了情報を乗せて、多地点テレ
ビ会議制御装置１へ通知する。多地点テレビ会議制御装
置１では、ＩＳＤＮ回線制御部１−１で取り出された会
議終了情報が中央制御部１−４へ送られ、回線交換部１
−２で当該回線を切断するともに、必要ならばＩＳＤＮ
回線制御部１−１により他のテレビ会議端末の網切断を
行う。When the conference is ended, the conference end information is added from the video conference terminal 2 to the user / user information element in the disconnection message of the ISDN from the video conference terminal 2 to notify the multipoint video conference control device 1. In the multipoint video conference control device 1, the conference end information extracted by the ISDN line control unit 1-1 is sent to the central control unit 1-4, and the line switching unit 1
-2 disconnects the line and ISDN if necessary
The line control unit 1-1 disconnects the network of other video conference terminals.
【００１８】[0018]
【発明の効果】以上説明したように本発明によれば、テ
レビ会議端末からの会議の開催／終了の指示を映像／音
声と同一の回線で行うことにより外部機器が不要とな
り、コストを低減することができる効果がある。また、
会議の開催情報を映像／音声と同様に多重化するのでは
なく、ＩＳＤＮのユーザ・ユーザ情報要素を使用するこ
とにより、会議の設定を会議形態（１対１接続、放送型
接続、多地点接続など）に制約されることなく同様に行
うことができる効果がある。As described above, according to the present invention, an instruction for holding / ending a conference from a video conference terminal is issued on the same line as video / audio, so that an external device is not required and cost is reduced. There is an effect that can be. Also,
By using the user-user information element of ISDN, instead of multiplexing the conference information like video / audio, the conference settings can be configured in a conference mode (one-to-one connection, broadcast type connection, multipoint connection). There is an effect that it can be similarly performed without being restricted by (for example).
【図１】本発明実施例の構成を示すブロック図。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
【図２】従来例の構成を示すブロック図。FIG. 2 is a block diagram showing a configuration of a conventional example.
１、１１ 多地点テレビ会議制御装置 １−１ ＩＳＤＮ回線制御部 １−２ 回線交換部 １−３ 多地点会議制御部 １−４ 中央制御部 ２ テレビ会議端末 ３ ＩＳＤＮ回線 １２ モデム １３ アナログ回線 １４ ＩＳＤＮ回線（Ｄチャネルパケット） １５ 会議予約制御装置 １６ 会議予約端末 １７ ターミナルアダプタ 1, 11 Multipoint video conference control device 1-1 ISDN line control unit 1-2 Circuit switching unit 1-3 Multipoint conference control unit 1-4 Central control unit 2 Video conference terminal 3 ISDN line 12 Modem 13 Analog line 14 ISDN Line (D channel packet) 15 Conference reservation controller 16 Conference reservation terminal 17 Terminal adapter
Claims (3)
と、このテレビ会議端末とＩＳＤＮ回線を介して接続さ
れ設定された会議形態に合わせた回線接続を含むテレビ
会議の制御を行う多地点テレビ会議制御装置とを備えた
テレビ会議システムにおいて、 前記テレビ会議端末は、会議形態および会議参加端末数
を含む会議開催情報をＩＳＤＮの呼設定メッセージ内の
ユーザ・ユーザ情報要素に設定して前記多地点テレビ会
議制御装置に発呼し会議の開催を指示する手段を備え、 前記多地点テレビ会議制御装置は、 前記テレビ会議端末からの呼設定メッセージ内のユーザ
・ユーザ情報要素から前記会議開催情報を分離するＩＳ
ＤＮ回線制御部と、 前記会議形態情報に基づいて、必要な回線を接続する回
線交換部と、 伝送される画像および音声データを分離して、会議に必
要な音声の加算ならびに画像の切替制御を行う多地点会
議制御部と、 前記ＩＳＤＮ回線制御部および前記回線制御部ならびに
前記多地点会議制御部を制御する中央制御部とを備えた
ことを特徴とする多地点テレビ会議システム。1. A multipoint television for controlling a videoconference including a plurality of videoconference terminals existing in a remote place and a line connection according to a set conference mode which is connected to the videoconference terminals via an ISDN line. In the video conference system including a conference control device, the video conference terminal sets conference holding information including a conference mode and a number of conference participants in a user / user information element in a call setting message of ISDN to perform the multipoint control. The multipoint video conference control device separates the conference holding information from the user / user information element in the call setting message from the video conference terminal, comprising means for calling the video conference control device and instructing to hold the conference. IS
A DN line control unit, a line switching unit that connects necessary lines based on the conference type information, and a separated image and voice data to be transmitted to control addition of voice and image switching control required for a conference. A multipoint video conference system comprising: a multipoint conference control unit for performing; and a central control unit for controlling the ISDN line control unit, the line control unit, and the multipoint conference control unit.
議形態を判断し前記ＩＳＤＮ回線制御部による他のテレ
ビ会議端末への発呼制御および前記回線交換部に対する
必要な回線接続制御ならびに前記多地点会議制御部での
多地点会議の運用管理を制御する手段を含む請求項１記
載の多地点テレビ会議システム。2. The central control unit determines a conference form based on conference holding information from the ISDN line control unit, controls the call to another video conference terminal by the ISDN line control unit, and performs the line switching. 2. The multipoint video conference system according to claim 1, further comprising means for controlling necessary line connection control for a department and operation management of the multipoint conference in the multipoint conference control unit.
ＩＳＤＮの切断メッセージ内のユーザ・ユーザ情報要素
に設定して前記多地点テレビ会議制御装置へ指示する手
段を含み、 前記多地点テレビ会議制御装置は、このテレビ会議端末
からの切断メッセージ内のユーザ・ユーザ情報要素内の
会議終了情報に基づいて、他のテレビ会議端末への切断
を行う手段を含む請求項１または２記載の多地点テレビ
会議システム。3. The multi-point video conference control, wherein the video conference terminal includes means for setting conference end information in a user-user information element in a disconnect message of ISDN and instructing the multi-point video conference control device. The multipoint television according to claim 1 or 2, wherein the apparatus includes means for disconnecting to another video conference terminal based on the conference end information in the user-user information element in the disconnect message from the video conference terminal. Conference system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5328685A JP2768248B2 (en) | 1993-12-24 | 1993-12-24 | Multipoint video conference system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5328685A JP2768248B2 (en) | 1993-12-24 | 1993-12-24 | Multipoint video conference system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07184183A true JPH07184183A (en) | 1995-07-21 |
| JP2768248B2 JP2768248B2 (en) | 1998-06-25 |
Family
ID=18213025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5328685A Expired - Fee Related JP2768248B2 (en) | 1993-12-24 | 1993-12-24 | Multipoint video conference system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2768248B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094214A (en) * | 1997-06-11 | 2000-07-25 | Nec Corporation | Multiple-point television meeting system and recording medium having recorded multiple-point television meeting control program therein |
| JP2005167903A (en) * | 2003-12-05 | 2005-06-23 | Ntt Comware Corp | Conference system, and conference room request accepting method |
| AU2001215578B2 (en) * | 2000-12-01 | 2006-12-14 | Ginganet Corporation | Teleconferencing system |
| US7808522B2 (en) * | 2001-02-06 | 2010-10-05 | Huawei Technologies Co., Ltd. | Method for calling video communication service by video communication terminal and associated message data form |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0310567A (en) * | 1989-06-08 | 1991-01-18 | Toshiba Corp | Call connection protocol system |
| JPH03245690A (en) * | 1990-02-23 | 1991-11-01 | Canon Inc | Inter-multi-point conference system |
| JPH0463084A (en) * | 1990-07-02 | 1992-02-28 | Nippon Telegr & Teleph Corp <Ntt> | Television conference system among scattered sites |
-
1993
- 1993-12-24 JP JP5328685A patent/JP2768248B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0310567A (en) * | 1989-06-08 | 1991-01-18 | Toshiba Corp | Call connection protocol system |
| JPH03245690A (en) * | 1990-02-23 | 1991-11-01 | Canon Inc | Inter-multi-point conference system |
| JPH0463084A (en) * | 1990-07-02 | 1992-02-28 | Nippon Telegr & Teleph Corp <Ntt> | Television conference system among scattered sites |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094214A (en) * | 1997-06-11 | 2000-07-25 | Nec Corporation | Multiple-point television meeting system and recording medium having recorded multiple-point television meeting control program therein |
| AU2001215578B2 (en) * | 2000-12-01 | 2006-12-14 | Ginganet Corporation | Teleconferencing system |
| US7808522B2 (en) * | 2001-02-06 | 2010-10-05 | Huawei Technologies Co., Ltd. | Method for calling video communication service by video communication terminal and associated message data form |
| JP2005167903A (en) * | 2003-12-05 | 2005-06-23 | Ntt Comware Corp | Conference system, and conference room request accepting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2768248B2 (en) | 1998-06-25 |
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