JPS62105588A - Video conference system between multispots - Google Patents
Video conference system between multispotsInfo
- Publication number
- JPS62105588A JPS62105588A JP24405285A JP24405285A JPS62105588A JP S62105588 A JPS62105588 A JP S62105588A JP 24405285 A JP24405285 A JP 24405285A JP 24405285 A JP24405285 A JP 24405285A JP S62105588 A JPS62105588 A JP S62105588A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- conference
- video
- video conference
- terminals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本願発明は、玉取上の複数の映像会議端末間で映像会議
制御装置を介して接続し、これらの映像会議端末相互間
で行う多地点間映像会議方式に関するものである。[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a multi-point communication system that connects a plurality of video conference terminals on a tamatori via a video conference control device, and performs multipoint communication between these video conference terminals. This relates to a video conferencing system.
従来の多地点間映像会議としては、複数の地点に設置さ
れた映像会議端末と多地点間映像会議制御装置を接続し
、それぞれの地点からの画面を合成あるいは切替え表示
する方式がある。また、複数のモニタに複数の対地の画
面を表示する方法としてフィールド多重方式があり、こ
の方式では時分割的に各フィールド毎に各対地の映像信
号を多重化し、3.2 Mb/sのフレーム内符号化方
式にょシ伝送している(沢田他東多地点間テレビ会Δ方
式l研実報33巻//号(/りrIlt))。As a conventional multipoint video conference, there is a method in which video conference terminals installed at multiple locations are connected to a multipoint video conference control device, and screens from each location are combined or switched for display. In addition, there is a field multiplexing method as a method for displaying screens of multiple stations on multiple monitors. In this system, the video signals of each station are multiplexed for each field in a time-division manner, and a frame of 3.2 Mb/s is created. It is transmitted using the inner encoding method (Sawada et al., Tokyo Multi-Point Television Conference Δ Method I Laboratory Report Vol. 33, No. 3 (/ri rIlt)).
しかし、端末と会議制御装置間の伝送距離が100Kr
n以上の長距離になると経済化をはかるため、通常、
/JMb/s 8度のフレーム間伝送路が用いられる(
黒田他東テレビ会議用1 ! Mb/sフレーム間符号
化装置〃、研実報33巻//号(/りr≠9゜このフレ
ーム間伝送路では、動きの少ない映像信号のフレームの
相関を利用して冗長度を抑圧しており、連続するフレー
ムの間に相関のない信号(例えばフィールド毎に異なる
地点の映像をフィールド多重した信号)を適用すると、
フレーム間符号化装置の中のバッファメモリがオーバフ
ローするため伝送できなり0これにより複数の地点の映
像信号を多重化して遠隔端末に伝送することができず、
複数地点の画面を同時表示できないという欠点があった
。However, the transmission distance between the terminal and the conference control device is 100Kr.
For long distances longer than n, in order to be economical, usually
/JMb/s An 8-degree interframe transmission path is used (
Kuroda and others for East TV conference 1! Mb/s interframe coding device〃, Kenjitsuho volume 33//issue (/rir≠9゜In this interframe transmission path, redundancy is suppressed by using the correlation of frames of video signals with little movement. If a signal with no correlation is applied between consecutive frames (for example, a signal in which images from different points are field-multiplexed for each field),
Because the buffer memory in the interframe encoding device overflows, it cannot be transmitted.As a result, video signals from multiple points cannot be multiplexed and transmitted to a remote terminal.
The drawback was that screens from multiple locations could not be displayed simultaneously.
本願発明は従来方式の欠点を解決するため、会議端末と
会議制御装置の間の伝送路に1冗長度抑圧を可変速度で
行う符号化復号化装置(例えばAjMb/sあるいは7
A t Kb/sの伝送速度) (T、 、Koga
。In order to solve the drawbacks of the conventional system, the present invention uses an encoding/decoding device (for example, AjMb/s or 7
Transmission rate of A t Kb/s) (T, , Koga
.
et、al:%5UB−T/ RATE MOTION
VIDEO0ODECFOR置EOONFERENO
E #、 IOC! Ir、t 2 り を用いてこれ
を多重化伝送することにより、同じ速度の伝送路を用い
て複数地点の画面を同時表示可能ならしめ、長地点間会
議において各対地の会議状況上把握できるようにする。et, al:%5UB-T/RATE MOTION
VIDEO0ODECFOR
E #, IOC! By multiplexing and transmitting this using Ir, t2, it is possible to simultaneously display screens from multiple locations using transmission lines with the same speed, and it is possible to grasp the conference situation at each location in a long point-to-point conference. Make it.
本願発明は、映像会議端末と要地点間会議制御装置に可
変速度の符号化・復号化装置を用い、この間の伝送路と
して地点数に対応して符号化速度を選定するとともにタ
イムスロット可変割当てによる多重分離を行い、複数地
点の映像信号を伝送可能にする。なお、従来の端末・制
御装置間の伝送方式は、固定の速度で映像信号の授受を
おこなっていた。The present invention uses a variable speed encoding/decoding device for a video conference terminal and a point-to-point conference control device, and selects the encoding speed corresponding to the number of points as a transmission path between them, and uses variable time slot allocation. Performs demultiplexing to enable transmission of video signals from multiple locations. Note that in the conventional transmission method between a terminal and a control device, video signals are exchanged at a fixed speed.
第1図は本願発明による三地点間会議の実施例である。 FIG. 1 shows an embodiment of a three-point conference according to the present invention.
/a + /a + /b + /c r /cは映像
会議端末、2ap、2a l jb t 、2c I
、2Cは速度可変形映像符号化復号化装置、3a 、3
c + IIa + tAcは多重分離装置、ja *
ja。/a + /a + /b + /c r /c is a video conference terminal, 2ap, 2a l jb t, 2c I
, 2C is a variable speed video encoding/decoding device, 3a, 3
c + IIa + tAc is a demultiplexer, ja *
ja.
、rb J tc l J−Cは速度可変形映像符号化
復号化装置、乙は多地点間映像会議制御装置である。同
図において/a 、 /aの端末からの映像信号は、2
a !−2aの符号化復号化装置でフレーム間の冗長度
が圧縮され、それぞれ7 A r Kb/sの伝送速度
に変換される。(例えば、/aでは人物像を送出し、/
aでは書画像を送出する)この信号は、3aの多重分離
装置でt!Mb/sの速度に多重化され、4aの多重分
離装置まで伝送される。jaで分離され、夕a及びja
の符号化復号化装置でディジタルの色分離映像信号に復
号され、tの多地点間映像会議制御装置に伝送される。, rb J tcl JC is a variable speed video encoding/decoding device, and B is a multipoint video conference control device. In the figure, video signals from terminals /a and /a are 2
a! -2a encoder/decoder compresses the redundancy between frames and converts each frame to a transmission rate of 7 Ar Kb/s. (For example, /a sends out a human image, /
(a) sends out a written image) This signal is sent to t! by the demultiplexer 3a. The signal is multiplexed at a speed of Mb/s and transmitted to a demultiplexer at 4a. Separated by ja, yua and ja
The signal is decoded into a digital color-separated video signal by the encoding/decoding device of t, and transmitted to the multipoint video conference control device of t.
また、/bの端末からは2bの符号化復号化装置により
/、!Mb/sのディジタル信号に変換され1、tbの
符号化復号化装置で復号され色分離映像信号の形式で乙
の制御装置に伝送される。さらに、/c。Also, from the terminal /b, the encoding/decoding device 2b transmits /,! The signal is converted into a digital signal of Mb/s, decoded by a 1.5 TB encoding/decoding device, and transmitted to the control device of Party B in the form of a color-separated video signal. Furthermore, /c.
/e’の端末の映像信号は/ap/a’の端末と同様に
2c + 、2C’およびtc・jC′の符号化復号化
装置1.3CTIAcの多重分離装置を用いて乙の制御
装置に伝送される。The video signal of the terminal /e' is sent to the control device of Party B using the 2c + , 2C' and tc/jC' encoding/decoding devices 1.3CTIAc demultiplexing device in the same way as the /ap/a' terminal. transmitted.
なお、実際には3と≠の符号化復号化装置間に伝送装置
及び交換装置などが入るが、本図では省略しである。ま
た、乙の会議制御装置から/a、/a’の端末側には上
述と逆方向の多重化伝送を行い、双方向の映像通信を行
う。Note that, in reality, a transmission device, a switching device, etc. are installed between the encoding/decoding devices 3 and ≠, but they are omitted in this figure. Furthermore, multiplex transmission in the opposite direction to that described above is performed from the conference control device of Party B to the terminals /a and /a', thereby performing two-way video communication.
さらに、会議に先だって、/の端末と2の会議制御装置
の間で会議情報(地点数9表示モニタ数等)を信号チャ
ネル(第7図の破線で示す)を用いて授受し、端末から
2の符号化復号化装置の速度、3の多重分離装置のタイ
ムロット割当てを指定するとともに、乙の会議制御装置
は≠の多重分離装置のタイムスロット割当てと!の符号
化復号化装置の速度を制御する。(第1図の一点鎖線で
示す)
このようにして/aの端末は/bとICの画面を各モニ
タに表示し、/bの端末は/a又はICの画面を切替え
表示する。Furthermore, prior to the conference, conference information (number of points, 9 display monitors, etc.) is exchanged between the terminal at / and the conference control device at 2 using a signal channel (indicated by the broken line in Figure 7), and the terminal In addition to specifying the speed of the encoder/decoder of , the time slot allocation of the demultiplexer of 3, and the time slot allocation of the demultiplexer of ! control the speed of the encoding/decoding device. (Indicated by the dashed line in FIG. 1) In this way, the /a terminal displays the /b and IC screens on each monitor, and the /b terminal switches to display the /a or IC screens.
第2図KAの多地点−】挟体会議制御装置の構成例を示
す。//a t //a 、 //b e //c 、
//c’は映像信号入力端子、/za + /コミ’
r /−2b l /jc ! /JC’ u映像信
号出力端子、#a + /3a’+ 7.3b t /
3c t /ic’は端末からの制御情報入力端子、/
4La l #a’l /!1tb’ l /4tCl
/4tC’は多重分離装置及び符号復号装置制御情報
出力端子、/ja + /ja’、 /jb + /夕
c r /!cは音声情報入力端子、/、ga l #
a’、 /Ab + #e + #c’は音声情報出方
端子、/7a t /7a + /7b r /7c
+ /7cは7V−、!メモリ、/どは状体切替え回路
、/りはレベル比較回路、コOは音声加算・ロス挿入回
路である。ここでa。FIG. 2 KA shows an example of the configuration of a multi-point conference controller. //at //a, //be //c,
//c' is the video signal input terminal, /za + /comi'
r/−2b l/jc! /JC' u video signal output terminal, #a + /3a'+ 7.3b t /
3c t /ic' is the control information input terminal from the terminal, /
4La l #a'l /! 1tb'l/4tCl
/4tC' is a demultiplexer and code/decoder control information output terminal, /ja + /ja', /jb + /c r /! c is the audio information input terminal, /, gal #
a', /Ab + #e + #c' are audio information output terminals, /7a t /7a + /7b r /7c
+ /7c is 7V-,! Memory, / is a state switching circuit, / is a level comparison circuit, and O is an audio addition/loss insertion circuit. Here a.
a t b HC) Cは第1図に対応している。同図
において、//からの映像信号は/7のフレームメモリ
に一旦蓄積された後、同一のクロック位相信号で続出さ
れ同期化される。この信号は/どの映像切替え回路で/
3の端末からの映像指定信号にもとすき、希望の対地の
映像信号が設定され/2の出力端子に送出される。#a
+ /4’a′、/4(b + /4’c+ /lA
c’つゝ′
は、端末からの会急情報にもとすいて多重分離装置のタ
イムスロット割描て及び符号化復号化装置の速度指定の
だめの制御端子である。一方、端末からの音声信号は/
jの端子から入力された後、/9でレベル比較され壷大
レベルのチャネルを検出するとともに、20で加算され
、さらにハウリング防止のためロスを挿入して/6の出
力端子に送出する。a t b HC) C corresponds to FIG. In the figure, the video signal from // is once stored in the frame memory of /7, and then outputted one after another using the same clock phase signal and synchronized. This signal is / Which video switching circuit /
Also, the desired terrestrial video signal is set in the video designation signal from the terminal 3 and sent to the output terminal 2. #a
+ /4'a', /4(b + /4'c+ /lA
C' is a control terminal for allocating time slots for the demultiplexer and specifying the speed for the encoder/decoder in response to urgent information from the terminal. On the other hand, the audio signal from the terminal is /
After being input from the terminal of j, the level is compared at /9 to detect a channel with a pot-sized level, and the signal is added at 20, a loss is inserted to prevent howling, and the signal is sent to the output terminal of /6.
このようにして、各端末からの映像信号の中から希望す
る対地の信号を取シだし、それぞれの端末に送出する。In this way, the desired ground signal is extracted from the video signals from each terminal and sent to each terminal.
また、各端末と会議制御装置の間の伝送路は/、jMb
/sの速度で一定であり、a汲びCの端末とはコチャネ
ル分の情報を授受してすべての対地の映像を見ながら会
廁を進めることか可能である。なお、本笑施例ではコチ
ャネ刀・の多重化の場合を説明したが、映像の動きが小
さい場合にはさらに多数のチャネルの多重化伝送が可能
であり、四地点以上の多地点会読にも適用可能である。Also, the transmission path between each terminal and the conference control device is /,jMb
The speed is constant at a speed of /s, and it is possible to exchange co-channel information with the terminal of A and C and proceed with the meeting while viewing images of all destinations. In addition, in this example, we explained the case of multiplexing the Kochaneto, but if the movement of the video is small, it is possible to multiplex transmission of an even larger number of channels. is also applicable.
以上説明したように本願発明によれば、速度可変の映像
符号化復号化装置を会議端末と金型制御装置に用いて多
重化伝送することにより、遠隔地の端末においても複数
の地点の画面を同時に表示可能となるので長地点間会議
の各対地の会議状況を把握でき、その効用が増すという
利点がある。As explained above, according to the present invention, by multiplexing transmission using a variable speed video encoding/decoding device for a conference terminal and a mold control device, screens at multiple points can be displayed even at a terminal in a remote location. Since they can be displayed simultaneously, it is possible to grasp the conference status at each destination in a long point-to-point conference, which has the advantage of increasing its effectiveness.
第1図 三池点間会議の実施例
/a + /a + /b + /c + /c ・・
・映像会議端末、!a、コa H,2b lコc 、
2c・・・速度可変形映像符号化復号化装置
3a r 3c r ≠a r lAc ”’多重分離
装置!a・ta・jb h !c + !c’・・・速
度司変形映像符号化彷号化装置
2・・・・・・多地点間映像会議制御装置第、2図 多
地点間映像会議制御装置の構成例//a + //a
+ 71b //c r //c’・・・映像信号入力
端子/2a r /2a’+ /、2b t Dc *
/2c’ ”゛映像信号出力端子/3a l /3t
1’T /3b l /3Cl /3C’ ””制御情
報入力端子/lAa * /4ta’+ #b r /
4tc + /lAc’ ”’多重分離装置及び符号復
号装置制御情報出力端子
/ja・#a + #b + 15c r /よC′・
・・音声情報入力端子/&a + #a + /Ah
+ lAc p /AC’ =・音声情報出力端子/7
a y /7a + /7b + /7c + /7c
−−−7L/ −A ) モリ/r・・・・・・映像
切替え回路、/P・・・・・・レベル比軟回路、20・
・・・・・音声加算・ロス挿入回路。Figure 1 Example of the Miike Point Conference/a + /a + /b + /c + /c ・・
・Video conference terminal! a, coa H, 2b lcoc,
2c... Variable speed video encoding/decoding device 3a r 3c r ≠ a r lAc ``' Demultiplexing device! a・ta・jb h !c + !c'... Variable speed video encoding code Multipoint video conference control device 2. Figure 2 Configuration example of multipoint video conference control device //a + //a
+71b //c r //c'...Video signal input terminal /2a r /2a'+ /, 2b t Dc *
/2c'"Video signal output terminal /3a l /3t
1'T /3b l /3Cl /3C'""Control information input terminal /lAa * /4ta'+ #br /
4tc + /lAc'``'Demultiplexer and encoder/decoder control information output terminal /ja・#a + #b + 15c r /yoC'・
・・Audio information input terminal /&a + #a + /Ah
+ lAc p /AC' =・Audio information output terminal/7
a y /7a + /7b + /7c + /7c
---7L/-A) Mori/r...Video switching circuit, /P...Level ratio soft circuit, 20.
...Audio addition/loss insertion circuit.
Claims (1)
議制御装置を接続し、該映像会議端末相互間で同時に通
信会議を行う多地点間映像会議において、 該映像端末では設定された表示すべきモニタ数に応じて
伝送速度を変化できる符号化復号化手段を複数個有する
とともに、タイムスロット可変割当てにより多重分離伝
送する手段を具備し、一方、前記多地点間映像会議制御
装置側では前記映像会議端末から伝送された制御情報に
もとづき速度可変させる複数の符号化復号化手段及び多
重分離伝送する手段を具備し、前記多地点間映像会議制
御装置では前記各端末からの映像信号の位相合わせを行
う手段、各映像信号を切替え・分配する手段、前記各端
末からの音声信号を加算する手段を具備し、 前記各映像会議端末と前記多地点間映像会議制御装置間
を会議に応じて映像信号の多重化方法を変えて伝送する
ことを特徴とする多地点間映像会議方式。[Scope of Claims] In a multipoint video conference in which a video conference terminal installed at three or more points and a multipoint video conference control device are connected, and a communication conference is simultaneously held between the video conference terminals, the video terminal In addition to having a plurality of encoding/decoding means that can change the transmission speed according to the set number of monitors to be displayed, the method also includes means for multiplexing and demultiplexing transmission by variable allocation of time slots. The control device side is equipped with a plurality of encoding/decoding means for varying the speed based on the control information transmitted from the video conference terminal, and a means for demultiplexing and transmitting. comprising means for adjusting the phase of video signals, means for switching and distributing each video signal, and means for adding audio signals from each of the terminals, and connecting between each of the video conference terminals and the multipoint video conference controller. A multipoint video conferencing system characterized by transmitting video signals by changing the multiplexing method depending on the conference.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24405285A JPS62105588A (en) | 1985-11-01 | 1985-11-01 | Video conference system between multispots |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24405285A JPS62105588A (en) | 1985-11-01 | 1985-11-01 | Video conference system between multispots |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62105588A true JPS62105588A (en) | 1987-05-16 |
Family
ID=17113009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24405285A Pending JPS62105588A (en) | 1985-11-01 | 1985-11-01 | Video conference system between multispots |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62105588A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6742046B2 (en) | 1992-09-21 | 2004-05-25 | Canon Kabushiki Kaisha | Network system and terminal apparatus |
-
1985
- 1985-11-01 JP JP24405285A patent/JPS62105588A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6742046B2 (en) | 1992-09-21 | 2004-05-25 | Canon Kabushiki Kaisha | Network system and terminal apparatus |
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