JP3334630B2 - Video / audio data simultaneous distribution method and multipoint video conference system - Google Patents
Video / audio data simultaneous distribution method and multipoint video conference systemInfo
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- JP3334630B2 JP3334630B2 JP21828498A JP21828498A JP3334630B2 JP 3334630 B2 JP3334630 B2 JP 3334630B2 JP 21828498 A JP21828498 A JP 21828498A JP 21828498 A JP21828498 A JP 21828498A JP 3334630 B2 JP3334630 B2 JP 3334630B2
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- video
- distribution
- video conference
- multiplexing
- audio data
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＩＴＵ−Ｔ標準の
Ｈ．３２０準拠による画像符号化装置をテレビ会議端末
に適用して一斉放送会議を行う映像／音声データ一斉配
信方法及び多地点テレビ会議システムに関し、特に、配
信先テレビ会議端末の数に制限されずに送信元テレビ会
議端末からの映像及び／又は音声データを一斉放送（一
括又は時系列的）して配信する映像／音声データ一斉配
信方法及び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 relates to the ITU-T standard H.264. TECHNICAL FIELD The present invention relates to a simultaneous video / audio data distribution method and a multipoint video conference system for performing a simultaneous broadcast conference by applying an image encoding device based on H.320 to a video conference terminal, and in particular, transmitting without limitation to the number of distribution destination video conference terminals. The present invention relates to a video / audio data simultaneous distribution method and a multipoint video conference system for simultaneously broadcasting (batch or time series) video and / or audio data from a former video conference terminal.
【０００２】[0002]
【従来の技術】従来、多地点テレビ会議システムでは、
ＩＴＵ−Ｔ標準のＨ．３２０準拠による画像符号化装置
をテレビ会議端末として使用した双方向による音声／画
像通信が行われる。また、このような多地点テレビ会議
システムでは、多地点のテレビ会議端末に対してセンタ
ー局（例えば、特定テレビ会議端末）などから音声／画
像通信を片方向で送信する場合がある。2. Description of the Related Art Conventionally, in a multipoint video conference system,
ITU-T standard H.264 Two-way audio / video communication is performed using an image encoding device based on H.320 as a video conference terminal. Further, in such a multipoint video conference system, a center station (for example, a specific video conference terminal) or the like may transmit voice / image communication in one direction to a multipoint video conference terminal.
【０００３】このＩＴＵ−Ｔ標準のＨ．３２０準拠によ
る画像符号化装置のテレビ会議端末では、片方向送信が
定義されていない。ＩＴＵ−Ｔ標準のＨ．３２０準拠に
よるテレビ会議端末では、必ず方方向通信によって、正
常なＨ．２４２手順による能力交換多重化処理が完了し
ないと、映像／音声データの通信が出来ない。[0003] The ITU-T standard H.264 One-way transmission is not defined in the video conference terminal of the image encoding device based on the 320 standard. ITU-T standard H.264 In a video conference terminal based on the H.320 standard, a normal H.320 is always used by one-way communication. Unless the capability exchange multiplexing process according to the H.242 procedure is completed, communication of video / audio data cannot be performed.
【０００４】このようにＨ．２４２手順による正常な能
力交換多重化処理が完了しないと、映像／音声データの
通信ができないため、片方向による一斉放送（ブロード
キャスト）通信においても、全ての配信先のテレビ会議
端末と１対１で、Ｈ．２２１手順によるフレームを設定
し、また、Ｈ．２４２手順による能力交換多重化処理を
行うための多重化回路を設けている。したがって、テレ
ビ会議端末（地点）が増加すると、この増加に伴って多
重化回路数が増加して、その装置規模が増大化する。As described above, H. Unless the normal capability exchange multiplexing process according to the H.242 procedure is completed, video / audio data cannot be communicated. Therefore, even in one-way simultaneous broadcast (broadcast) communication, one-to-one communication with all distribution destination video conference terminals is required. , H .; 221. A frame is set according to the H.221 procedure. A multiplexing circuit for performing the capacity exchange multiplexing process according to the H.242 procedure is provided. Therefore, when the number of video conference terminals (points) increases, the number of multiplexing circuits increases with the increase, and the device scale increases.
【０００５】このような多地点テレビ会議システムとし
て、特開平７−３８８７１号「放送型会議用画像伝送装
置」公報の従来例があり、この従来例では、多地点に音
声、映像データを一斉放送しているが、障害状況や回線
状況を監視し、送信側の画像符号器の周期的な長時間を
要するリフレッシュ動作に代えて、短時間でリフレッシ
ュを行っている。また、特開平７−６６８７６号「多地
点会議システム及び多重接続装置」公報の従来例では、
多重化した映像データを個々に分離する複数の多重化接
続装置を相互に接続可能にして、多数の会議端末による
同時会議を行っている。As such a multipoint video conference system, there is a conventional example of Japanese Patent Application Laid-Open No. 7-38871, entitled "Broadcasting Conference Image Transmission Apparatus". In this conventional example, audio and video data are broadcast simultaneously to multiple points. However, a failure state and a line state are monitored, and the refresh operation is performed in a short time instead of the periodic long refresh operation of the image encoder on the transmission side. Also, in the conventional example of Japanese Patent Application Laid-Open No. Hei 7-66876 “Multipoint conference system and multiple access device”,
A plurality of multiplex connection devices for individually separating multiplexed video data can be connected to each other, and simultaneous conferences are held by a large number of conference terminals.
【０００６】[0006]
【発明が解決しようとする課題】上記従来例の多地点テ
レビ会議システムでは、ＩＴＵ−Ｔ標準のＨ．３２０準
拠にあって、Ｈ．２４２手順による正常な能力交換多重
化処理が完了した後に、映像／音声データの通信を行う
ため、全配信先のテレビ会議端末と１対１で、Ｈ．２２
１手順に基づいてフレームを設定し、また、Ｈ．２４２
手順による能力交換多重化処理の完了処理を行う多数の
多重化回路が必要になり、装置規模が増大化するという
欠点があった。In the above-mentioned conventional multipoint video conference system, the H.264 standard of the ITU-T standard is used. H.320 compliant. After the normal capability exchange and multiplexing process according to the H.242 procedure is completed, in order to perform communication of video / audio data, one-to-one communication with the video conference terminals of all distribution destinations is performed. 22
A frame is set based on the H.1 procedure. 242
A large number of multiplexing circuits for completing the capacity exchange multiplexing process according to the procedure are required, and there is a drawback that the apparatus scale is increased.
【０００７】本発明は、このような従来の技術における
課題を解決するものであり、ＩＴＵ−Ｔ標準のＨ．３２
０準拠における配信先の画像符号化装置のテレビ会議端
末数と同数の多重化回路が必要なくなり、装置規模が縮
小されて、その放送（一括又は時系列的）による配信が
可能になる映像／音声データ一斉配信方法及び多地点テ
レビ会議システムの提供を目的とする。The present invention has been made to solve the above-mentioned problems in the prior art, and is based on ITU-T standard H.264. 32
The number of multiplexing circuits as many as the number of video conferencing terminals of the image encoding device of the distribution destination in conformity with the O. 0 is not required, and the size of the device is reduced, and the video / audio that can be distributed by the broadcast (batch or time series) becomes possible. It aims to provide a simultaneous data distribution method and a multipoint video conference system.
【０００８】[0008]
【課題を解決するための手段】上記課題を達成するため
に、本発明の映像／音声データ一斉配信方法は、送信元
装置からの映像及び／又は音声データを複数の端末に放
送して配信する映像／音声データ一斉配信方法におい
て、前記送信元装置との能力交換多重化処理を実行し、
前記送信元装置と多地点テレビ会議制御装置との間の通
信を確立し、その後、送信元多重化処理と分配多重化処
理及び能力交換多重化処理のフレーム構成を同一に設定
し、更に、分配多重化処理と能力交換多重化処理とのフ
レーム位相を同一に設定し、次に、能力交換多重化処理
と複数の端末との回線を接続して、それぞれの端末との
能力交換多重化処理を実行し、前記多地点テレビ会議制
御装置と前記複数の端末との間の通信を確立し、その
後、分配多重化処理からの映像及び／又は音声データを
前記複数の端末へ放送によって配信している。In order to achieve the above object, a method for simultaneously distributing video / audio data of the present invention broadcasts and distributes video and / or audio data from a transmission source device to a plurality of terminals. in the video / audio data broadcasted method, perform capability exchange multiplexing processing with the transmission source device,
Communication between the source device and the multipoint video conference controller
After that , the frame configuration of the source multiplexing process, the distribution multiplexing process, and the capability exchange multiplexing process are set to be the same, and the frame phases of the distribution multiplexing process and the capability exchange multiplexing process are the same. , And then connects the capability exchange multiplexing process and a line with a plurality of terminals, executes the capability exchange multiplexing process with each terminal, and executes the multipoint video conference system.
Establishing communication between the control device and the plurality of terminals,
Later , the video and / or audio data from the distribution multiplexing process is
The broadcast is distributed to the plurality of terminals.
【０００９】この映像／音声データ一斉配信方法におけ
る前記映像及び／又は音声データの複数の端末への配信
を、端末ごとに回線接続し、かつ、能力交換多重化処理
を完了して、前記多地点テレビ会議制御装置と前記複数
の端末との間の通信を確立した後に、分配多重化処理か
ら映像及び／又は音声データを、複数の端末へ一斉放送
で一括して行行っている。In this method of simultaneous distribution of video / audio data,
That the video and / or delivery to a plurality of terminals of the audio data, and the line connection for each terminal, and, to complete the capability exchange multiplexing process, the said multipoint video conference control device more
After the communication with the terminal is established, the video and / or audio data from the distribution multiplexing process is simultaneously broadcast to a plurality of terminals.
【００１０】更に、前記映像及び／又は音声データの複
数の端末への配信を、端末ごとに順次回線接続し、か
つ、順次能力交換多重化処理を完了して、前記多地点テ
レビ会議制御装置と前記複数の端末との間の通信を確立
した後に、分配多重化処理から複数の端末のそれぞれへ
映像及び／又は音声データを順次放送して時系列的に行
っている。[0010] Further, the distribution of the video and / or audio data to a plurality of terminals is sequentially connected to each terminal, and the capability exchange multiplexing process is sequentially completed, thereby completing the multipoint communication.
Establish communication between the Levi conference control device and the plurality of terminals
After is performed in a time-series video and / or audio data sequentially broadcast to the from the distribution multiplexing processing to each of the plurality of terminals.
【００１１】本発明の多地点テレビ会議システムは、映
像及び／又は音声データを送出する送信元テレビ会議端
末と、映像及び／又は音声データを放送して配信するた
めの多地点テレビ会議制御装置と、映像及び／又は音声
データを受信する複数の配信先テレビ会議端末とを有
し、前記多地点テレビ会議制御装置が、前記送信元テレ
ビ会議端末との能力交換多重化処理の完了後に前記送信
元テレビ会議端末との間の通信を確立すると共に、送信
元多重化処理と分配多重化処理及び能力交換多重化処理
のフレーム構成を同一に設定し、更に、分配多重化処理
と能力交換多重化処理とのフレーム位相を同一に設定し
て回線接続し、前記配信先テレビ会議端末との能力交換
多重化処理が完了して前記配信先テレビ会議端末との間
の通信が確立した後に、分配多重化処理を通じて映像及
び／又は音声データを複数の配信先テレビ会議端末に放
送して配信する構成としてある。[0011] A multipoint video conference system according to the present invention comprises a source video conference terminal for transmitting video and / or audio data, and a multipoint video conference control device for broadcasting and distributing video and / or audio data. , and a plurality of distribution destination television conference terminal for receiving video and / or audio data, said multipoint video conference control device, the transmission after completion of the capability exchange multiplexing processing with the transmission source teleconference terminal
Establish communication with the former video conference terminal , set the same frame structure for source multiplexing, distribution multiplexing, and capacity exchange multiplexing, and further perform distribution multiplexing and capacity exchange multiplexing. Set the same frame phase as the process and connect the line, and complete the capability exchange multiplexing process with the destination video conference terminal and complete the process with the destination video conference terminal.
After the communication is established, video and / or audio data is broadcast and distributed to a plurality of distribution destination video conference terminals through distribution multiplexing processing.
【００１２】前記多地点テレビ会議システムにおける前
記映像及び／又は音声の複数の端末への配信を、端末ご
とに回線接続し、かつ、能力交換多重化処理を完了し
て、前記多地点テレビ会議制御装置と前記複数の端末と
の間の通信を確立した後に、分配多重化処理から映像及
び／又は音声データを複数の端末へ一斉放送で一括して
行い、又は、端末ごとに回線接続し、かつ、能力交換多
重化処理を完了して、前記多地点テレビ会議制御装置と
前記複数の端末との間の通信を確立した後に、分配多重
化処理から映像及び／又は音声データを複数の端末のそ
れぞれへ順次放送して時系列的に行う構成としてある。[0012] The delivery to the multipoint video conference plurality of terminals prior <br/> SL video and / or audio in the system, and the line connection for each terminal, and, to complete the capability exchange multiplexing process, the A multipoint video conference control device and the plurality of terminals;
After establishing communication between the terminals, video and / or audio data is simultaneously broadcast to a plurality of terminals from the distribution multiplexing process, or a line is connected to each terminal, and the capability exchange multiplexing process is performed. To complete the multipoint video conference controller and
After the communication with the plurality of terminals is established , video and / or audio data is sequentially broadcast from the distribution multiplexing process to each of the plurality of terminals and time-sequentially performed.
【００１３】また、前記多地点テレビ会議制御装置が、
映像及び／又は音声データのフレームを構成／分離し、
かつ、能力交換多重化処理を行うための送信元多重化回
路と、配信先テレビ会議端末に映像及び／又は音声デー
タを分配するための分配多重化回路と、送信元テレビ会
議端末と配信先テレビ会議端末とが、動作開始時又は回
線接続復旧時に能力交換多重化処理を行うための能力交
換多重化回路と、前記分配多重化回路及び能力交換多重
化回路の入出力を切り替えて分配ラインインタフェース
回路との接続を切り替える切替回路と、送信元テレビ会
議端末と切替回路とを通じた送信元多重化回路との間の
映像及び／又は音声データのインターフェース処理を行
う送信元ラインインターフェース回路と、配信先テレビ
会議端末のそれぞれと切替回路を通じた前記分配多重化
回路及び能力交換多重化回路とのインターフェース処理
を行う分配ラインインタフェース回路とを備える構成と
してある。[0013] Further, the multipoint video conference control device includes:
Compose / separate frames of video and / or audio data,
A source multiplexing circuit for performing a capability exchange multiplexing process, a distribution multiplexing circuit for distributing video and / or audio data to a destination video conference terminal, a source video conference terminal and a destination television A conference terminal, a capacity exchange multiplexing circuit for performing a capacity exchange multiplexing process at the start of operation or restoration of line connection, and a distribution line interface circuit by switching input / output of the distribution multiplexing circuit and the capacity exchange multiplexing circuit. A switching circuit for switching the connection with the transmission source, a source line interface circuit for performing interface processing of video and / or audio data between the source video conference terminal and the source multiplexing circuit through the switching circuit, and a destination television Distribution lines for interfacing each of the conference terminals with the distribution multiplexing circuit and the capability exchange multiplexing circuit through a switching circuit It is constituted and a interface circuit.
【００１４】また、前記フレームを構成／分離をＩＴＵ
−Ｔ標準のＨ．３２０におけるＨ．２２１手順で実行
し、能力交換多重化処理をＨ．２４２手順で実行する構
成としてある。Further, the frame is composed / separated by ITU.
H.-T standard. H.320. 221 procedure, and the capability exchange multiplexing process is performed according to H.221. 242 procedures.
【００１５】前記放送の配信後に、能力交換多重化回路
が、分配ラインインタフェース回路を通じて配信先テレ
ビ会議端末からの受信データを順次取り込んで監視し、
配信先テレビ会議端末から再能力交換要求を受信した際
に、分配多重化回路から能力交換多重化回路に切替回路
の接続を戻して、配信先テレビ会議端末との能力交換多
重化処理を実行して、完了後に再度分配多重化回路へ接
続を戻して動作開始状態に設定する構成としてある。[0015] After the distribution of the broadcast, the capability exchange multiplexing circuit sequentially receives and monitors the received data from the destination video conference terminal through the distribution line interface circuit, and monitors the data.
Upon receiving a re-capability exchange request from the distribution destination video conference terminal, the connection of the switching circuit is returned from the distribution multiplexing circuit to the capability exchange multiplexing circuit, and the capability exchange multiplexing process with the distribution destination video conference terminal is executed. Then, after completion, the connection is returned to the distribution multiplexing circuit again to set the operation start state.
【００１６】このような構成の発明の映像／音声データ
一斉配信方法及び多地点テレビ会議システムは、送信元
テレビ会議端末との能力交換多重化処理動作を完了して
通信を確立し、かつ、送信元多重化処理と分配多重化処
理及び能力交換多重化処理とのフレーム構成を同一に設
定し、更に、分配多重化処理と能力交換多重化処理との
フレーム位相を同一に設定する。また、能力交換多重化
処理と複数の配信先テレビ会議端末との回線を接続し
て、それぞれの配信先テレビ会議端末との能力交換多重
化処理が完了して通信が確立した後に、分配多重化処理
による映像及び／又は音声データを複数の配信先テレビ
会議端末に放送によって配信している。The video / audio data simultaneous distribution method and the multipoint video conference system according to the invention having the above-described configurations complete the capability exchange multiplexing operation with the source video conference terminal to establish communication and transmit. The frame configurations of the original multiplexing process, the distribution multiplexing process and the capacity exchange multiplexing process are set to be the same, and the frame phases of the distribution multiplexing process and the capability exchange multiplexing process are set to be the same. Also, by connecting a line between the capability exchange multiplexing process and a plurality of destination video conference terminals, distribution multiplexing is performed after the capability exchange multiplexing process with each destination video conference terminal is completed and communication is established. The video and / or audio data resulting from the processing is distributed by broadcast to a plurality of destination teleconference terminals.
【００１７】この結果、配信先テレビ会議端末の数に制
限されずに送信元テレビ会議端末からの映像及び／又は
音声データを放送して配信できるようになる。すなわ
ち、従来は、Ｈ．２４２手順での正常な能力交換多重化
処理が完了しないと、映像／音声データの通信ができな
いため、片方向による一斉放送においても、全ての配信
先のテレビ会議端末と１対１で、Ｈ．２２１手順のフレ
ームを設定し、また、Ｈ．２４２手順による能力交換多
重化処理を行うための多重化回路を設ける必要がある
が、本発明では ＩＴＵ−Ｔ標準のＨ．３２０準拠にお
ける画像符号化装置のテレビ会議端末数と同数の多重化
回路が必要なくなり、配信先テレビ会議端末の数が増加
しても送信元多重化回路、分配多重化回路、能力交換多
重化回路及び切替回路ですむことになる。したがって、
装置規模が縮小されて、その放送による配信が可能にな
る。As a result, video and / or audio data from the source video conference terminal can be broadcast and distributed without being limited by the number of destination video conference terminals. That is, conventionally, H. Unless the normal capability exchange and multiplexing process in the H.242 procedure is completed, video / audio data cannot be communicated. Therefore, even in one-way simultaneous broadcasting, H.264 is one-to-one with all distribution destination video conference terminals. H.221 procedure frame is set. Although it is necessary to provide a multiplexing circuit for performing the capacity exchange multiplexing process according to the H.242 procedure, in the present invention, H.264 of the ITU-T standard is used. The same number of multiplexing circuits as the number of video conferencing terminals of the image coding apparatus in compliance with the standard 320 are not required, and even if the number of video conferencing terminals to be distributed increases, a source multiplexing circuit, a distribution multiplexing circuit, and a capability exchange multiplexing circuit And a switching circuit. Therefore,
The scale of the device is reduced, and the broadcast distribution becomes possible.
【００１８】また、本発明の映像／音声データ一斉配信
方法及び多地点テレビ会議システムは、配信先テレビ会
議端末との能力交換多重化処理が完了して通信を確立し
た後に、分配多重化処理から映像及び／又は音声データ
を一斉放送によって一括して配信し、又は、映像及び／
又は音声データを順次放送によって時系列的に配信して
いる。Further, the simultaneous video / audio data distribution method and the multipoint video conference system according to the present invention, after completing the capability exchange multiplexing process with the distribution destination video conference terminal and establishing communication, start the distribution multiplexing process. Distribute video and / or audio data all at once by broadcast, or
Alternatively, audio data is distributed in time series by broadcasting.
【００１９】この結果、設計時などでの一斉放送による
一括配信、又は、順次放送による時系列的な配信の選択
が可能になり、そのシステム構築の自由度が向上する。As a result, it is possible to select the simultaneous distribution by simultaneous broadcasting or the time-series distribution by sequential broadcasting at the time of design or the like, and the degree of freedom in system construction is improved.
【００２０】[0020]
【発明の実施の形態】次に、本発明の映像／音声データ
一斉配信方法及び多地点テレビ会議システムの実施の形
態を図面を参照して詳細に説明する。図１は本発明の映
像／音声データ一斉配信方法及び多地点テレビ会議シス
テムの実施形態における構成を示すブロック図である。
図１に示す多地点テレビ会議システムは、映像／音声デ
ータを一斉放送（あとで説明する配信先テレビ会議端末
４−１〜４−ｎへの一括配信、又は、時系列的な配信）
による配信を制御する多地点テレビ会議制御装置（ＭＣ
Ｕ）１と、映像／音声データを伝送する通信路２と、映
像／音声データを一斉放送するための送信元テレビ会議
端末３と、この送信元テレビ会議端末３からの一斉放送
の映像／音声データを受信する配信先テレビ会議端末４
−１，４┼２…４−ｎとを有している。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a multi-point video conference system according to an embodiment of the present invention; FIG. 1 is a block diagram showing a configuration of an embodiment of a video / audio data simultaneous distribution method and a multipoint video conference system according to the present invention.
The multipoint video conference system shown in FIG. 1 broadcasts video / audio data simultaneously (batch distribution to distribution destination video conference terminals 4-1 to 4-n described later or time-series distribution).
Multipoint Video Conference Controller (MC)
U) 1, a communication path 2 for transmitting video / audio data, a source video conference terminal 3 for broadcasting the video / audio data, and a video / audio of the broadcast from the source video conference terminal 3. Distribution destination video conference terminal 4 for receiving data
-1, 4┼2... 4-n.
【００２１】多地点テレビ会議制御装置１は、ＩＴＵ−
Ｔ標準のＨ．３２０準拠によるＨ．２２１手順によって
フレームを構成／分離し、かつ、Ｈ．２４２手順による
能力交換多重化処理を行うための送信元多重化回路１１
と、配信先テレビ会議端末４−１〜４−ｎに、送信元テ
レビ会議端末３からの映像／音声データを分配するため
の分配多重化回路１２と、送信元テレビ会議端末３と配
信先テレビ会議端末４−１〜４−ｎとの間で、テレビ会
議開始時や回線接続の復旧時に能力交換を行うための能
力交換多重化回路１３とを有している。The multipoint video conference control device 1 is an ITU-
T. standard H. H.320 compliance. The frame is constructed / separated by the H.221 procedure, and Source multiplexing circuit 11 for performing the capacity exchange multiplexing process according to the H.242 procedure
A distribution multiplexing circuit 12 for distributing video / audio data from the source video conference terminal 3 to the destination video conference terminals 4-1 to 4-n; It has a capability exchange multiplexing circuit 13 for exchanging capabilities with the conference terminals 4-1 to 4-n at the time of starting a video conference or restoring the line connection.
【００２２】また、多地点テレビ会議制御装置１は、分
配多重化回路１２、能力交換多重化回路１３の入出力を
切り替えて分配ラインＩ／Ｆ回路１６−１〜１６−ｎと
の接続を切り替えるための切替回路１４と、送信元テレ
ビ会議端末３と切替回路１４を通じた送信元多重化回路
１１との間の映像／音声データのインターフェース処理
を行う送信元ラインインターフェース（Ｉ／Ｆ）回路１
５と、配信先テレビ会議端末４−１〜４−ｎのそれぞれ
と切替回路１４を通じた分配多重化回路１２、能力交換
多重化回路１３との間でインターフェース処理を行う分
配ラインＩ／Ｆ回路１６−１，１６−２…１６−ｎとを
有している。The multipoint video conference controller 1 switches the input and output of the distribution multiplexing circuit 12 and the capacity exchange multiplexing circuit 13 to switch the connection with the distribution line I / F circuits 16-1 to 16-n. Line interface (I / F) circuit 1 for performing interface processing of video / audio data between the source video conference terminal 3 and the source multiplexing circuit 11 through the switching circuit 14
5, a distribution line I / F circuit 16 for performing interface processing between the distribution destination video conference terminals 4-1 to 4-n and the distribution multiplexing circuit 12 and the capability exchange multiplexing circuit 13 through the switching circuit 14. -1, 16-2... 16-n.
【００２３】次に、この実施形態の動作について説明す
る。図２は実施形態の動作を説明するためのブロック図
であり、図３は実施形態の他の動作を説明するためのブ
ロック図である。図２に示すように、一斉放送の動作開
始時に送信元テレビ会議端末３と送信元多重化回路１１
との間が通信路２、送信元ラインＩ／Ｆ回路１５及び切
替回路１４を通じて接続される。ＩＴＵ−Ｔ標準のＨ．
３２０準拠におけるＨ．２４２手順による能力交換多重
化処理（動作開始時の能力交換多重化処理）が完了し
て、映像／音声データの通信が確立した後に、分配多重
化回路１２と能力交換多重化回路１３のフレーム構成を
送信元多重化回路１１と同一に設定し、更に、分配多重
化回路１２と能力交換多重化回路１３との出力フレーム
位相を同一に設定する。Next, the operation of this embodiment will be described. FIG. 2 is a block diagram for explaining the operation of the embodiment, and FIG. 3 is a block diagram for explaining another operation of the embodiment. As shown in FIG. 2, the source video conference terminal 3 and the source multiplexing circuit 11
Are connected through the communication path 2, the transmission source line I / F circuit 15 and the switching circuit 14. ITU-T standard H.264
H.320 compliance. After the capability exchange multiplexing process (the capability exchange multiplexing process at the start of the operation) by the H.242 procedure is completed and the communication of the video / audio data is established, the frame configuration of the distribution multiplexing circuit 12 and the capability exchange multiplexing circuit 13 Is set to be the same as that of the source multiplexing circuit 11, and further, the output frame phases of the distribution multiplexing circuit 12 and the capacity exchange multiplexing circuit 13 are set to be the same.
【００２４】次に、能力交換多重化回路１３と配信先テ
レビ会議端末４−１と切替回路１４との間を、通信路２
及び分配ラインＩ／Ｆ回路１６−１を通じて回線接続
し、Ｈ．２４２手順による能力交換多重化処理（回線接
続復旧時の能力交換多重化処理）を完了して通信が確立
した後に、切替回路１４によって送信元を能力交換多重
化回路１３から分配多重化回路１２に切り替える。更
に、能力交換多重化回路１３と配信先テレビ会議端末４
−２とを通信路２、分配ラインＩ／Ｆ回路１６−２を通
じて回線接続し、Ｈ．２４２手順による能力交換多重化
処理（回線接続復旧時の能力交換多重化処理）が完了し
て通信が確立した後に、切替回路１４によって送信元を
能力交換多重化回路１３から分配多重化回路１２に切り
替える。Next, the communication path 2 is connected between the capacity exchange multiplexing circuit 13, the destination video conference terminal 4-1 and the switching circuit 14.
And a line connection through the distribution line I / F circuit 16-1. After the completion of the capacity exchange multiplexing process according to the H.242 procedure (capacity exchange multiplexing process at the time of line connection restoration) and the establishment of communication, the switching circuit 14 switches the transmission source from the capacity exchange multiplexing circuit 13 to the distribution multiplexing circuit 12. Switch. Further, the capability exchange multiplexing circuit 13 and the destination video conference terminal 4
-2 is connected to the communication path 2 through the communication path 2 and the distribution line I / F circuit 16-2. After the capacity exchange multiplexing process according to the H.242 procedure (capacity exchange multiplexing process at the time of line connection restoration) is completed and communication is established, the switching circuit 14 switches the transmission source from the capacity exchange multiplexing circuit 13 to the distribution multiplexing circuit 12. Switch.
【００２５】同様にして、能力交換多重化回路１３と配
信先テレビ会議端末４−ｎとを通信路２、分配ラインＩ
／Ｆ回路１６−ｎを通じて回線接続し、Ｈ．２４２手順
による能力交換多重化処理が完了して通信が確立した後
に、切替回路１４によって送信元を能力交換多重化回路
１３から分配多重化回路１２に切り替える。この後に、
送信元テレビ会議端末３からの映像／音声データを配信
先テレビ会議端末４−１〜４−ｎの全てに一斉放送によ
って一括して配信する。Similarly, the capacity exchange multiplexing circuit 13 and the distribution destination video conference terminal 4-n are connected to the communication path 2 and the distribution line I.
/ F circuit 16-n. After the capacity exchange multiplexing process according to the H.242 procedure is completed and communication is established, the switching circuit 14 switches the transmission source from the capacity exchange multiplexing circuit 13 to the distribution multiplexing circuit 12. After this,
The video / audio data from the source video conference terminal 3 is distributed to all of the destination video conference terminals 4-1 to 4-n by simultaneous broadcast.
【００２６】なお、ここでは配信先テレビ会議端末４−
１〜４−ｎの全部に一括して一斉放送による配信を行っ
ている。これに対して、配信先テレビ会議端末４−１〜
４−ｎへ順次（時系列的）に、放送による配信を行うこ
とも出来る。すなわち、一つの配信先テレビ会議端末
（４−１〜４−ｎ）ごとの能力交換多重化処理が完了し
て通信が確立し、かつ、送信元を能力交換多重化回路１
３から分配多重化回路１２に切り替えた後に、この配信
先テレビ会議端末（４−１〜４−ｎ）に映像／音声デー
タを配信し、この後に同様の動作で次の配信先テレビ会
議端末（４−１〜４−ｎ）に映像／音声データを配信す
るようにしても良い。この場合、配信先テレビ会議端末
（４−１〜４−ｎ）の設置数が多い場合は、一斉放送の
配信終了までに時間がかかることになる。It should be noted that here, the distribution destination video conference terminal 4-
Broadcasting is simultaneously performed on all of the programs 1 to 4-n. On the other hand, the distribution destination video conference terminals 4-1 to 4-1
4-n, it is also possible to sequentially (time-sequentially) broadcast distribution. That is, the capability exchange multiplexing process is completed for each of the destination video conference terminals (4-1 to 4-n), communication is established, and the transmission source is set to the capability exchange multiplexing circuit 1.
After switching from 3 to the distribution multiplexing circuit 12, the video / audio data is distributed to the distribution destination video conference terminals (4-1 to 4-n). Video / audio data may be distributed to 4-1 to 4-n). In this case, when the number of distribution destination video conference terminals (4-1 to 4-n) is large, it takes time to finish the distribution of the simultaneous broadcast.
【００２７】この一斉放送の配信後に、通常動作（初期
動作）に設定する場合、能力交換多重化回路１３が、通
信路２、分配ラインＩ／Ｆ回路１６−１〜１６−ｎを通
じて配信先テレビ会議端末４−１〜４−ｎからの受信デ
ータを順次取り込んで監視する。能力交換多重化回路１
３は、この監視で配信先テレビ会議端末４−１〜４−ｎ
からＨ．２４２手順の再能力交換要求を受信すると、分
配多重化回路１２から能力交換多重化回路１３へ切替回
路１４接続を戻し、再度、上記同様の動作を行って、当
該配信先テレビ会議端末４−１〜４−ｎとＨ．２４２手
順による能力交換多重化処理を実行し、この完了後に再
度分配多重化回路１２へ接続を戻す。When the normal operation (initial operation) is set after the broadcasting of the broadcast, the capacity exchange multiplexing circuit 13 is connected to the distribution destination television through the communication path 2 and the distribution line I / F circuits 16-1 to 16-n. The data received from the conference terminals 4-1 to 4-n are sequentially taken in and monitored. Capability exchange multiplexing circuit 1
3 is the distribution destination video conference terminals 4-1 to 4-n
To H. When the re-capability exchange request of the H.242 procedure is received, the connection of the switching circuit 14 is returned from the distribution multiplexing circuit 12 to the capability exchange multiplexing circuit 13, and the same operation as described above is performed again. -N and H.-N. The capacity exchange multiplexing process according to the H.242 procedure is executed, and after the completion, the connection is returned to the distribution multiplexing circuit 12 again.
【００２８】このように、この実施形態では、配信先テ
レビ会議端末４−１〜４−ｎの数に制限されずに、送信
元多重化回路１１、分配多重化回路１２、能力交換多重
化回路１３及び切替回路１４のみで送信元テレビ会議端
末３からの映像／音声データを配信先テレビ会議端末４
−１〜４−ｎの全てに一斉放送によって配信できるよう
になる。したがって、従来のように配信先テレビ会議端
末４−１〜４−ｎと同数の多重化回路が不要になり、そ
の構成が簡素化される。As described above, in this embodiment, the source multiplexing circuit 11, the distribution multiplexing circuit 12, and the capacity exchange multiplexing circuit are not limited to the number of the destination video conference terminals 4-1 to 4-n. 13 and the switching circuit 14, the video / audio data from the source video conference terminal 3 is transmitted to the destination video conference terminal 4.
-1 to 4-n can be distributed by simultaneous broadcasting. Therefore, unlike the related art, the same number of multiplexing circuits as the distribution destination video conference terminals 4-1 to 4-n are not required, and the configuration is simplified.
【００２９】また、この実施形態では映像／音声データ
を、配信先テレビ会議端末４−１〜４−ｎに同時に配信
（伝送）しているが、文字説明画像データや、音声デー
タのみを別個に配信することも出来る。この場合、送信
元テレビ会議端末３を画像／音声データを選択して配信
できるように構成する。In this embodiment, the video / audio data is simultaneously distributed (transmitted) to the distribution destination video conference terminals 4-1 to 4-n. However, only the character explanation image data and the audio data are separately provided. Can also be distributed. In this case, the source video conference terminal 3 is configured to be able to select and distribute image / audio data.
【００３０】[0030]
【発明の効果】以上の説明から明らかなように、本発明
の映像／音声データ一斉配信方法及び多地点テレビ会議
システムによれば、送信元テレビ会議端末との能力交換
多重化処理動作を完了して通信を確立し、かつ、フレー
ム構成及びフレーム位相を同一に設定し、更に、複数の
配信先テレビ会議端末との回線を接続して、それぞれの
配信先テレビ会議端末との能力交換多重化処理が完了し
て通信が確立した後に、分配多重化処理による映像及び
／又は音声データを、複数の配信先テレビ会議端末に放
送して配信している。As is apparent from the above description, according to the simultaneous video / audio data distribution method and the multipoint video conference system of the present invention, the capability exchange multiplexing operation with the source video conference terminal is completed. Establish communication with each other, set the same frame configuration and the same frame phase, and connect lines to a plurality of destination video conference terminals to perform capability exchange multiplexing with each of the destination video conference terminals. Is completed and the communication is established, the video and / or audio data obtained by the distribution multiplexing process is broadcast to a plurality of destination video conference terminals and distributed.
【００３１】この結果、ＩＴＵ−Ｔ標準のＨ．３２０準
拠における画像符号化装置のテレビ会議端末数と同数の
多重化回路が必要なくなり、装置規模が縮小されて、そ
の放送による配信が可能になる。As a result, the H.264 standard of the ITU-T standard is used. The same number of multiplexing circuits as the number of video conference terminals of the image encoding device conforming to the 320 standard is not required, and the size of the device is reduced, and the distribution by broadcasting becomes possible.
【００３２】また、本発明の映像／音声データ一斉配信
方法及び多地点テレビ会議システムによれば、配信先テ
レビ会議端末との能力交換多重化処理が完了して通信を
確立した後に、分配多重化処理から映像及び／又は音声
データを一斉放送によって一括して配信し、又は、映像
及び／又は音声データを順次放送によって時系列的に配
信している。According to the video / audio data simultaneous distribution method and the multipoint video conference system of the present invention, distribution multiplexing is performed after the capability exchange multiplexing process with the distribution destination video conference terminal is completed and communication is established. From the processing, the video and / or audio data is distributed collectively by simultaneous broadcasting, or the video and / or audio data is distributed in time series by broadcasting.
【００３３】この結果、設計時などでの一斉放送による
一括配信、又は、順次放送による時系列的な配信の選択
が可能になり、そのシステム構築の自由度が向上するよ
うになる。As a result, it becomes possible to select the simultaneous distribution by simultaneous broadcasting or the time-series distribution by sequential broadcasting at the time of design, etc., and the degree of freedom in system construction is improved.
【図１】本発明の映像／音声データ一斉配信方法及び多
地点テレビ会議システムの実施形態における構成を示す
ブロック図である。FIG. 1 is a block diagram showing a configuration of an embodiment of a video / audio data simultaneous distribution method and a multipoint video conference system according to the present invention.
【図２】実施形態の動作を説明するためのブロック図で
ある。FIG. 2 is a block diagram for explaining the operation of the embodiment.
【図３】実施形態の他の動作を説明するためのブロック
図である。FIG. 3 is a block diagram for explaining another operation of the embodiment.
１ 多地点テレビ会議制御装置（ＭＣＵ） ２ 通信路 ３ 送信元テレビ会議端末 ４−１〜４−ｎ 配信先テレビ会議端末 １１ 送信元多重化回路 １２ 分配多重化回路 １３ 能力交換多重化回路 １４ 切替回路 １５ 送信元ラインＩ／Ｆ回路 １６−１〜１６−ｎ 分配ラインＩ／Ｆ回路 Reference Signs List 1 Multipoint video conference control device (MCU) 2 Communication path 3 Source video conference terminal 4-1 to 4-n Destination video conference terminal 11 Source multiplexing circuit 12 Distribution multiplexing circuit 13 Capability exchange multiplexing circuit 14 Switching Circuit 15 Source line I / F circuit 16-1 to 16-n Distribution line I / F circuit
Claims (8)
ータを複数の端末に放送して配信する映像／音声データ
一斉配信方法において、前記 送信元装置との能力交換多重化処理を実行し、前記
送信元装置と多地点テレビ会議制御装置との間の通信を
確立し、 その後 、送信元多重化処理と分配多重化処理及び能力交
換多重化処理のフレーム構成を同一に設定し、 更に、分配多重化処理と能力交換多重化処理とのフレー
ム位相を同一に設定し、 次に、能力交換多重化処理と複数の端末との回線を接続
して、それぞれの端末との能力交換多重化処理を実行
し、前記多地点テレビ会議制御装置と前記複数の端末と
の間の通信を確立し、 その後 、分配多重化処理からの映像及び／又は音声デー
タを前記複数の端末へ放送によって配信することを特徴
とする映像／音声データ一斉配信方法。1. A video / audio data simultaneous distribution method for broadcasting and transmitting video and / or audio data from a transmission source device to a plurality of terminals, wherein a capability exchange multiplexing process with the transmission source device is performed, Said
Communication between the source device and the multipoint video conference controller
Established, then set the same frame configuration for source multiplexing, distribution multiplexing, and capacity exchange multiplexing, and set the same frame phase for distribution multiplexing and capacity exchange multiplexing. Then, connect a line between the capability exchange multiplexing process and a plurality of terminals, execute a capability exchange multiplexing process with each terminal, and execute the multipoint video conference control device and the plurality of terminals.
Establishing a communication between, then, the video / audio data broadcasted method characterized in that the video and / or audio data from the distributor multiplex processing distributed by broadcast to said plurality of terminals.
端末への配信を、 端末ごとに回線接続し、かつ、能力交換多重化処理を完
了して、前記多地点テレビ会議制御装置と前記複数の端
末との間の通信を確立した後に、分配多重化処理から映
像及び／又は音声データを、複数の端末へ一斉放送で一
括して行うことを特徴とする請求項１記載の映像／音声
データ一斉配信方法。2. Delivery of the video and / or audio data to a plurality of terminals is performed by connecting a line to each terminal and completing a capability exchange multiplexing process, and the multipoint video conference controller and the plurality of terminals are connected to each other. End of
2. The video / audio data according to claim 1, wherein after establishing communication with the terminal, the video / audio data from the distribution multiplexing process is simultaneously broadcast to a plurality of terminals. Broadcast method.
端末への配信を、 端末ごとに順次回線接続し、かつ、順次能力交換多重化
処理を完了して、前記多地点テレビ会議制御装置と前記
複数の端末との間の通信を確立した後に、分配多重化処
理から複数の端末のそれぞれへ映像及び／又は音声デー
タを順次放送して時系列的に行うことを特徴とする請求
項１記載の映像／音声データ一斉配信方法。3. A delivery to a plurality of terminals of the video and / or audio data, sequentially line connection for each terminal, and, to complete the sequential capability exchange multiplex processing, said multipoint video conference control device Said
2. The method according to claim 1, wherein after establishing communication with the plurality of terminals, the video and / or audio data is sequentially broadcast from the distribution multiplexing process to each of the plurality of terminals and performed in chronological order. Method of simultaneous distribution of video / audio data.
信元テレビ会議端末と、映像及び／又は音声データを放
送して配信するための多地点テレビ会議制御装置と、映
像及び／又は音声データを受信する複数の配信先テレビ
会議端末とを有し、 前記多地点テレビ会議制御装置が、 前記送信元テレビ会議端末との能力交換多重化処理の完
了後に前記送信元テレビ会議端末との間の通信を確立す
ると共に、送信元多重化処理と分配多重化処理及び能力
交換多重化処理のフレーム構成を同一に設定し、更に、
分配多重化処理と能力交換多重化処理とのフレーム位相
を同一に設定して回線接続し、前記配信先テレビ会議端
末との能力交換多重化処理が完了して前記配信先テレビ
会議端末との間の通信が確立した後に、分配多重化処理
を通じて映像及び／又は音声データを複数の配信先テレ
ビ会議端末に放送して配信することを特徴とする多地点
テレビ会議システム。4. A video conference terminal for transmitting video and / or audio data, a multipoint video conference controller for broadcasting and delivering video and / or audio data, and A plurality of destination video conference terminals to be received, wherein the multipoint video conference control device communicates with the source video conference terminal after the capability exchange multiplexing process with the source video conference terminal is completed. And establish the same frame configuration for the source multiplexing process, the distribution multiplexing process, and the capability exchange multiplexing process.
The frame phase of the distribution multiplex processing and capability exchange multiplexing process is set to the same and the line connection, the destination television conference terminal
The delivery destination TV and capability exchange multiplexing process with the youngest is completed
A multi-point video conference system characterized in that video and / or audio data is broadcast and distributed to a plurality of destination video conference terminals through a distribution multiplexing process after communication with the conference terminal is established.
の配信を、 端末ごとに回線接続し、かつ、能力交換多
重化処理を完了して前記多地点テレビ会議制御装置と前
記複数の端末との間の通信を確立した後に、分配多重化
処理から映像及び／又は音声データを複数の端末へ一斉
放送で一括して行い、又は、端末ごとに回線接続し、か
つ、能力交換多重化処理を完了して前記多地点テレビ会
議制御装置と前記複数の端末との間の通信を確立した後
に、分配多重化処理から映像及び／又は音声データを複
数の端末のそれぞれへ順次放送して時系列的に行うこと
を特徴とする請求項４記載の多地点テレビ会議システ
ム。5. Delivery of the video and / or audio to a plurality of terminals is performed by connecting a line to each terminal, and completing a capability exchange multiplexing process to communicate with the multipoint video conference controller.
After establishing communication with the plurality of terminals, video and / or audio data from the distribution multiplexing process is simultaneously broadcast to the plurality of terminals, or a line is connected to each terminal, and the multi-point video meetings to complete the capability exchange multiplexing process
After establishing communication between the control device and the plurality of terminals , sequentially performing video and / or audio data from the distribution multiplexing process to each of the plurality of terminals in a time-series manner. The multipoint video conference system according to claim 4.
かつ、能力交換多重化処理を行うための送信元多重化回
路と、 配信先テレビ会議端末に映像及び／又は音声データを分
配するための分配多重化回路と、 送信元テレビ会議端末と配信先テレビ会議端末とが、動
作開始時又は回線接続復旧時に能力交換多重化処理を行
うための能力交換多重化回路と、 前記分配多重化回路及び能力交換多重化回路の入出力を
切り替えて分配ラインインタフェース回路との接続を切
り替える切替回路と、 送信元テレビ会議端末と切替回路とを通じた送信元多重
化回路との間の映像及び／又は音声データのインターフ
ェース処理を行う送信元ラインインターフェース回路
と、 配信先テレビ会議端末のそれぞれと切替回路を通じた前
記分配多重化回路及び能力交換多重化回路とのインター
フェース処理を行う分配ラインインタフェース回路と、 を備えることを特徴とする請求項４記載の多地点テレビ
会議システム。6. The multipoint video conference controller comprises: a frame for video and / or audio data;
And a source multiplexing circuit for performing a capability exchange multiplexing process, a distribution multiplexing circuit for distributing video and / or audio data to a destination video conference terminal, a source video conference terminal and a destination television A conference terminal, a capacity exchange multiplexing circuit for performing capacity exchange multiplexing processing at the start of operation or at the time of line connection restoration, and a distribution line interface circuit by switching input / output of the distribution multiplexing circuit and the capacity exchange multiplexing circuit. A switching circuit for switching the connection with the transmission line, a transmission line interface circuit for interfacing video and / or audio data between the transmission source video conference terminal and the transmission source multiplexing circuit through the switching circuit, and a distribution destination television A distribution line for interfacing each of the conference terminals with the distribution multiplexing circuit and the capability exchange multiplexing circuit through a switching circuit; Multipoint teleconference system according to claim 4, characterized in that it comprises a down interface circuit.
準のＨ．３２０におけるＨ．２２１手順で実行し、か
つ、能力交換多重化処理をＨ．２４２手順で実行するこ
と特徴とする請求項４記載の多地点テレビ会議システ
ム。7. The frame configuration / separation according to ITU-T standard H.264. H.320. 221 procedure, and the capability exchange multiplexing process is performed according to H.221. 5. The multi-point video conference system according to claim 4, wherein the multi-point video conference system is executed in 242 procedures.
を通じて配信先テレビ会議端末からの受信データを順次
取り込んで監視し、配信先テレビ会議端末から再能力交
換要求を受信した際に、分配多重化回路から能力交換多
重化回路に切替回路の接続を戻して、配信先テレビ会議
端末との能力交換多重化処理を実行し、この完了後に再
度分配多重化回路へ接続を戻して動作開始状態に設定す
ること特徴とする請求項４記載の多地点テレビ会議シス
テム。8. After the distribution of the broadcast, a capability exchange multiplexing circuit sequentially receives and monitors data received from the destination video conference terminal through the distribution line interface circuit, and monitors a re-capability exchange request from the destination video conference terminal. Upon reception, the connection of the switching circuit is returned from the distribution multiplexing circuit to the capacity exchange multiplexing circuit, the capability exchange multiplexing process with the distribution destination video conference terminal is performed, and after this completion, the connection to the distribution multiplexing circuit is performed again 5. The multipoint video conference system according to claim 4, wherein the multi-point video conference system is set back to an operation start state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21828498A JP3334630B2 (en) | 1998-07-31 | 1998-07-31 | Video / audio data simultaneous distribution method and multipoint video conference system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21828498A JP3334630B2 (en) | 1998-07-31 | 1998-07-31 | Video / audio data simultaneous distribution method and multipoint video conference system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000050225A JP2000050225A (en) | 2000-02-18 |
| JP3334630B2 true JP3334630B2 (en) | 2002-10-15 |
Family
ID=16717440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21828498A Expired - Fee Related JP3334630B2 (en) | 1998-07-31 | 1998-07-31 | Video / audio data simultaneous distribution method and multipoint video conference system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3334630B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6477150B1 (en) | 2000-03-03 | 2002-11-05 | Qualcomm, Inc. | System and method for providing group communication services in an existing communication system |
| US8411594B2 (en) | 2002-09-20 | 2013-04-02 | Qualcomm Incorporated | Communication manager for providing multimedia in a group communication network |
| JP2009135589A (en) | 2007-11-28 | 2009-06-18 | Ntt Docomo Inc | Mobile communication terminal and signal relay method |
| US11606537B2 (en) | 2010-05-25 | 2023-03-14 | Cisco Technology, Inc. | System and method for scalable media switching conferencing |
| NO333235B1 (en) | 2010-05-25 | 2013-04-15 | Cisco Systems Int Sarl | System and method for conferences with scalable media switching |
| DE202019105391U1 (en) * | 2019-09-27 | 2019-10-16 | Kwd Kupplungswerk Dresden Gmbh | Clutch for rail vehicles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0574062U (en) * | 1992-03-09 | 1993-10-08 | 三菱電機株式会社 | Image communication device |
| JPH07297881A (en) * | 1994-04-28 | 1995-11-10 | Canon Inc | Communication terminal equipment and communication system using it |
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1998
- 1998-07-31 JP JP21828498A patent/JP3334630B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000050225A (en) | 2000-02-18 |
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