JPH0423588A - Multi-point conference system - Google Patents
Multi-point conference systemInfo
- Publication number
- JPH0423588A JPH0423588A JP12803290A JP12803290A JPH0423588A JP H0423588 A JPH0423588 A JP H0423588A JP 12803290 A JP12803290 A JP 12803290A JP 12803290 A JP12803290 A JP 12803290A JP H0423588 A JPH0423588 A JP H0423588A
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- Prior art keywords
- conference
- image compression
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- conference room
- transmitting
- Prior art date
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- 230000006835 compression Effects 0.000 claims abstract description 49
- 238000007906 compression Methods 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000008054 signal transmission Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概 要〕
３地点以上の会議室間で画像圧縮伝送装置を用いテレビ
画像を授受して会議を行う多地点会議システムに関し、
安価に構成出来る多地点会議システムの提供を目的とし
、
センタを設け、
各会議室には、
該センタに圧縮画像データを送信する画像圧縮送信装置
と、
該センタよりの圧縮画像データを受信する２台の画像圧
縮受信装置と、
会議中を示す信号を送信する信号送信手段とを備え、
該センタには、
各会議室の信号送信手段より送られてくる信号により互
いに論議している２会議室を検出する検出手段と、
検出された２会議室よりの圧縮画像データを、全会議室
の該２つの画像圧縮受信装置に分配送信する分配送信手
段と、
該検出手段にて検出された会議室が変わると、変わった
会議室の画像圧縮送信装置に、初期状態から改めて送信
し直すデマンドレフレッシュ信号を送出するデマンドレ
フレッシュ信号送出手段とを設けた構成とする。[Detailed Description of the Invention] [Summary] To provide a multipoint conference system that can be configured at low cost, regarding a multipoint conference system that conducts a conference by transmitting and receiving television images between conference rooms at three or more locations using an image compression transmission device. For the purpose of this, a center is set up, and each conference room is equipped with an image compression transmitter that transmits compressed image data to the center, and two image compression receivers that receive compressed image data from the center. and a signal transmitting means for transmitting a signal indicating that the center is in a discussion with each other based on the signal sent from the signal transmitting means of each conference room; a distribution transmission means for distributing and transmitting compressed image data from two conference rooms to the two image compression receiving devices of all conference rooms; and when the conference room detected by the detection means changes, an image of the changed conference room is transmitted. The compression transmitting device is provided with a demand refresh signal transmitting means for transmitting a demand refresh signal to be transmitted again from an initial state.
本発明は、３地点以上の会議室間で画像圧縮伝送装置を
用いテレビ画像を授受して会議を行う多地点会議システ
ムの改良に関する。The present invention relates to an improvement in a multipoint conference system that uses an image compression and transmission device to send and receive television images between conference rooms at three or more locations to conduct a conference.
近年テレビ会議システムを利用する企業等においては、
組織が拡大し、■業務に関係する部門が増加しており、
今迄使われてきた１：１の２会議室間の会議だけでなく
、３会議室以上の間で会議を行うことが不可欠の要求と
なってきた。In recent years, companies using video conferencing systems,
The organization has expanded and the number of departments related to business has increased.
It has become essential to hold meetings not only between two conference rooms in a 1:1 ratio that has been used until now, but also between three or more conference rooms.
この場合の多地点会議システムとしては安価なシステム
であることが要望される。In this case, the multipoint conference system is desired to be an inexpensive system.
第７図は従来例の５地点会議システムのブロック図であ
る。FIG. 7 is a block diagram of a conventional five-point conference system.
従来の多地点会議システムは、■＝１の２会議室間で使
用している画像圧縮送信装置１０と画像圧縮受信装置１
１よりなる画像圧縮伝送装置を夫々各会議室におくよう
にしている。A conventional multipoint conference system has an image compression transmitting device 10 and an image compression receiving device 1 used between two conference rooms with ■=1.
An image compression/transmission device consisting of 1 is placed in each conference room.
従って例えば５地点会議システムの場合は、第７図に示
す如く２０台の画像圧縮送信装置１０と２０台の画像圧
縮受信装置１１を設置して任意の会議室間で会議を行え
るようにしている。Therefore, for example, in the case of a five-point conference system, 20 image compression transmitting devices 10 and 20 image compression receiving devices 11 are installed as shown in FIG. 7 so that a conference can be held between arbitrary conference rooms. .
しかしながら、上記従来の多地点会議システムでは、画
像圧縮伝送装置の台数が多くなり、会議システムが高価
になる問題点がある。However, the conventional multipoint conference system described above has the problem that the number of image compression and transmission devices increases, making the conference system expensive.
本発明は、安価で構成出来る多地点会議システムの提供
を目的としている。The present invention aims to provide a multipoint conference system that can be configured at low cost.
第１図は本発明の原理ブロック図である。 FIG. 1 is a block diagram of the principle of the present invention.
第１図に示す如く、３地点以上の会議室１，２゜３、・
・間で画像圧縮伝送装置を用いテレビ画像を授受して会
議を行う多地点会議システムにおいて、
センタ２０を設け、
各会議室１，２，３． ・・には、
該センタ２０に圧縮画像データを送信する画像圧縮送信
装置１０と、
該センタ２０よりの圧縮画像データを受信する２台の画
像圧縮受信装置１１．１２と、
会議中を示す信号を送信する信号送信手段１３とを備え
、
該センタ２０には、
各会議室の信号送信手段１３より送られてくる信号によ
り互いに論議している２会議室を検出する検出手段２１
と、
検出された２会議室よりの圧縮画像データを、全会議室
の該２つの画像圧縮受信装置ｌｌ、１２に分配送信する
分配送信手段２２と、
該検出手段２１にて検出された会議室が変わると、変わ
った会議室の画像圧縮送信装置１０に、初期状態から改
めて送信し直すデマンドレフレッシュ信号を送出するデ
マンドレフレッシュ信号送出手段２３とを設ける。As shown in Figure 1, conference rooms 1, 2゜3, .
- In a multipoint conference system in which a conference is held by transmitting and receiving television images between conference rooms using an image compression transmission device, a center 20 is provided, and each conference room 1, 2, 3, . ... includes an image compression transmitter 10 that transmits compressed image data to the center 20, two image compression receivers 11 and 12 that receive compressed image data from the center 20, and a signal indicating that a conference is in progress. The center 20 includes a detection means 21 for detecting two conference rooms having a discussion with each other based on signals sent from the signal transmission means 13 of each conference room.
, a distribution transmitting means 22 for distributing and transmitting compressed image data from the two detected conference rooms to the two image compression receiving devices ll, 12 of all the conference rooms; and a conference room detected by the detecting means 21. When the change occurs, the image compression and transmission device 10 of the new conference room is provided with a demand refresh signal sending means 23 for sending out a demand refresh signal to be transmitted again from the initial state.
本発明によれば、各会議室１，２，３． ・・よりは
、画像圧縮送信装置１０にてセンタ２０に圧縮画像デー
タを送ると共に、信号送信手段１３にて会議中を示す信
号を送信しており、センタ２０では、各会議室より送ら
れてくる会議中を示す信号により、検出手段２１にて互
いに論議している２会議室を検出し、分配送信手段２２
にて、検出した２会議室の画像圧縮送信装置１０よりの
圧縮画像データを全会議室の２つの画像圧縮受信装置１
１．１２に分配送信する。According to the invention, each conference room 1, 2, 3 . ..., the image compression and transmission device 10 sends compressed image data to the center 20, and the signal transmission means 13 sends a signal indicating that a meeting is in progress. Based on the signal indicating that a meeting is in progress, the detection means 21 detects two conference rooms that are discussing with each other, and the distribution transmission means 22
The compressed image data from the detected image compression transmitter 10 of the two conference rooms is transmitted to the two image compression receivers 1 of all conference rooms.
Distributed and transmitted on 1.12.
この時、検出手段２１にて検出された会議室が変わると
、変わった会議室の画像圧縮送信装置１０に、デマンド
レフレッシュ信号送出手段２３にて、初期状態から改め
て送信し直すデマンドレフレッシュ信号を送出し、画像
圧縮送信装置１０を切り替えても、画像圧縮受信装置に
て再生出来るようにしている。At this time, when the conference room detected by the detection means 21 changes, the demand refresh signal transmission means 23 retransmits a demand refresh signal from the initial state to the image compression and transmission device 10 of the changed conference room. Even if the image compression transmitter 10 is switched, it can be reproduced by the image compression receiver.
このようにすると、会議室の数が多くなっても、各会議
室には、画像圧縮送信装置１台と、画像圧縮受信装置２
台と、信号送信手段１３を備え、センタ２０には、検出
手段２１と、分配送信手段２２と、デマンドレフレッシ
ュ信号送出手段２３を設けるだけでよいので、従来の多
地点会議システムに比し安価にすることが出来る。In this way, even if the number of conference rooms increases, each conference room will have one image compression transmitter and two image compression receivers.
Since the center 20 only needs to be provided with a detection means 21, a distribution transmission means 22, and a demand refresh signal transmission means 23, it is cheaper than a conventional multipoint conference system. It can be done.
（実施例〕
第２図は本発明の実施例の５地点会議システムの要部の
ブロック図、第３図は本発明の実施例の会議室の要部の
ブロック図、第４図は本発明の実施例のセンタのブロッ
ク図、第５図は本発明の実施例のデマンドレフレッシュ
信号と送信画像信号との関係を示す図、第６図は本発明
の実施例の最寄り２パルス検出部の最寄りパルス検出を
示す図である。(Embodiment) FIG. 2 is a block diagram of the main parts of a five-point conference system according to an embodiment of the present invention, FIG. FIG. 5 is a diagram showing the relationship between the demand refresh signal and the transmitted image signal in the embodiment of the present invention, and FIG. 6 is a block diagram of the center of the embodiment of the present invention. FIG. 3 is a diagram showing nearest pulse detection.
本発明の場合は、各会議室１〜５には、第２図第３図に
示す如く、画像圧縮送信装置１０と、画像圧縮受信装置
１１．１２と、会話中を示す信号を送信する会話検出部
１３−１を設ける。In the case of the present invention, as shown in FIGS. 2 and 3, each conference room 1 to 5 is equipped with an image compression transmitting device 10, an image compression receiving device 11, 12, and a conversation device that transmits a signal indicating that a conversation is in progress. A detection section 13-1 is provided.
ここで、会話検出部１３−１につき第３図にて説明する
。Here, the conversation detection section 13-1 will be explained with reference to FIG.
会話検出部１３−１では、マイク３０よりの会話中の（
Ａ）に示す如き音声を入力し、エンベロープ作成部３１
にて、（Ａ）のａに示す如き音声信号のエンベロープ信
号を作成し、比較器３２に入力し、比較器３２にて、（
Ａ）のＶに示す如き電圧と比較し、電圧■を越えている
間、（Ｂ）に示す如く、ルベルのパルスを出力し、オン
信号選択パルス出力部３３に入力する。The conversation detection unit 13-1 detects (
Input the audio as shown in A) and send it to the envelope creation section 31.
, an envelope signal of the audio signal as shown in a of (A) is created, inputted to the comparator 32, and the comparator 32 calculates (
The voltage is compared with the voltage shown by V in A), and while the voltage exceeds the voltage ■, a pulse of Level is output as shown in (B) and inputted to the ON signal selection pulse output section 33.
オン信号選択パルス出力部３３では、４秒間にルベルが
２秒以上あると、論議をかわしていると見做せるので、
入力信号をサンプリングすることにより、４秒間にルベ
ルが２秒以上あるかどうかを選択し、ある場合には（Ｃ
）に示す如きパルスを出力し、センタ２０に送る。In the on signal selection pulse output section 33, if there is a rubel for 2 seconds or more in 4 seconds, it can be considered that the argument is being avoided.
By sampling the input signal, we select whether there are more than 2 seconds of rubel in 4 seconds, and if there is (C
) and sends it to the center 20.
センタ２０には、第２図、第４図に示す如く、最寄り２
パルス検出部２１−１．デマンドレフレッシュ信号送出
部２３．スイッチ制御部２２−１、スイッチ部２２−２
を設け、最寄り２パルス検出部２１−１にて論議中の２
会議室を検出し、スイッチ制御部２２−１及びデマンド
レフレッシュ信号送出部２３に知らせる。As shown in FIGS. 2 and 4, the center 20 has two nearest
Pulse detection section 21-1. Demand refresh signal sending unit 23. Switch control section 22-1, switch section 22-2
2 under discussion in the nearest 2 pulse detection unit 21-1.
The conference room is detected and notified to the switch control section 22-1 and the demand refresh signal sending section 23.
この最寄り２パルス検出部２１−１の選択方法としては
、例えば第６図に示す如く、会話検出部１３−１よりの
論議中であることを示すパルスが、会議室１よりは、（
Ａ）に示す如くイ、への時点にて入力し、会議室２より
は、（Ｂ）に示す如く口、二、への時点にて入力し、会
議室３よりは、（Ｃ）に示す如くホ、トの時点にて入力
していたとすると、イ１ロ、ハ、二の時点では、会議室
１゜２の２パルスが最寄りであるので、論議中の会議室
は１と２とし、二、ホ、へ、トの時点では、会議室２．
３の２パルスが最寄りであるので、論議中の会議室は２
と３として、スイッチ制御部２２−１及びデマンドレフ
レッシュ信号送出部２３に知らせる。As shown in FIG. 6, for example, as shown in FIG.
As shown in A), the input is made at point B, from conference room 2, input is made at point 2, as shown in (B), and from conference room 3, input is made at point 2, as shown in (C). Assuming that the input is made at points E and G, the two pulses of conference room 1 and 2 are the closest at points A, B, C, and II, so the conference rooms under discussion are set as 1 and 2. At the time of 2, H, H, G, conference room 2.
The 2nd pulse of 3 is the closest, so the conference room under discussion is 2nd pulse.
and 3, the switch control unit 22-1 and the demand refresh signal sending unit 23 are notified.
次に、第４図にてセンタ２０の構成を説明する。Next, the configuration of the center 20 will be explained with reference to FIG.
各会議室１〜５の画像圧縮送信装置１０よりの圧縮画像
データは、スイッチ部２２−２の、夫々バッファ５０，
５１． ・・５５に人力し、出力は、切替スイッチ４
０−１．４０−２．４１−１．４１−２．・・４５−１
．４５−２の夫々異なる端子に入力している。The compressed image data from the image compression/transmission device 10 of each of the conference rooms 1 to 5 is transferred to the buffer 50 and the buffer 50 of the switch section 22-2, respectively.
51.・・55 is manually operated, and the output is set by changeover switch 4.
0-1.40-2.41-1.41-2.・・45-1
．． The signals are input to different terminals of 45-2.
そして、切替スイッチ４０＝１．４０−２．４１−１．
４１−２． ・・４５−１．４５−２の夫々の共通端
子よりの信号は、夫々会議室１〜５の画像圧縮受信′装
置１１．１２に入力するようになっている。Then, the changeover switch 40=1.40-2.41-1.
41-2. The signals from the common terminals of 45-1 and 45-2 are input to the image compression/receiving devices 11 and 12 of conference rooms 1 to 5, respectively.
そこで１、最寄り２パルス検出部２１−２より、例えば
会議室１と２が論議中との通知がスイッチ制御部２２−
１に入力すると、スイッチ制御部２２−１は、切替スイ
ッチ４０−１．４］、−１・・・４５−１では１、会議
室１より送信された圧縮画像データを、夫ノアの会議室
１，２，３，４．５の画像圧縮受信装置１１に送るよう
にし、切替スイッチ４０−２．４１−２・・・４５−２
では、会議室２より送信された圧縮画像データを、夫々
の会議室１，２，３，４．５の画像圧縮受信装置１２に
送るように制御する。Therefore, 1, the nearest 2 pulse detection unit 21-2 notifies the switch control unit 22-2 that, for example, conference rooms 1 and 2 are in discussion.
1, the switch control unit 22-1 selects 1 for the selector switches 40-1.4], -1...45-1, and transfers the compressed image data transmitted from conference room 1 to husband Noah's conference room. 1, 2, 3, 4.5, and selector switches 40-2, 41-2...45-2.
Now, the compressed image data transmitted from the conference room 2 is controlled to be sent to the image compression receiving apparatus 12 of each of the conference rooms 1, 2, 3, 4.5.
次に、最寄り２パルス検出部２１−２より、例えば会議
室２と３が論議中との通知が、スイッチ制御部２２−１
に入力すると、スイッチ制御部２２−１は、切替スイッ
チ４０−１．４１−１ ・・・４５−１で６．ｔ１会議
室３より送信された圧縮画像データを、夫々の会議室１
，２，３．４．５の画像圧縮受信装置１１に送るように
切り替える。Next, the nearest two pulse detection unit 21-2 sends a notification to the switch control unit 22-2 that, for example, conference rooms 2 and 3 are in discussion.
, the switch control unit 22-1 switches the changeover switches 40-1, 41-1, . . . , 45-1 to 6. The compressed image data sent from t1 conference room 3 is sent to each conference room 1.
, 2, 3.4.5.
この場合、会議室３の画像圧縮送信装置１ｏよりは、初
期画像データを送り以後差分圧縮画像データを送信しな
いと、切り替えにより会議室３の画像圧縮送信装置１０
より受信する画像圧縮受信装置１１は復号出来ない。In this case, if the image compression and transmission device 1o of the conference room 3 sends the initial image data and does not transmit differential compressed image data thereafter, the image compression and transmission device 1o of the conference room 3
The image compression receiving device 11 that receives the image cannot decode it.
そ、二で、最寄り２パルス検出部２１−２は、選択した
２会議室を常にデマンドレフレッシュ信号送出部２３に
通知しており、デマンドレフレッシュ信号送出部２３で
は、第５図（Ａ）に示す如く、論議している会議室が変
わると、（Ｂ）に示す如く、切り替わった会議室の画像
圧縮送信装置１０にはデマンドレフレッシュ信号を送信
し、（Ｃ）に示す如く、初期画像データ次に差分圧縮画
像データを送信するようにさせる。Second, the nearest two pulse detection section 21-2 always notifies the demand refresh signal transmission section 23 of the two selected conference rooms, and the demand refresh signal transmission section 23 detects the two conference rooms as shown in FIG. 5(A). As shown in (B), when the conference room being discussed changes, a demand refresh signal is sent to the image compression/transmission device 10 of the switched conference room, as shown in (C), and the initial image is updated as shown in (C). data, then the differentially compressed image data is transmitted.
このようにすれば、各会議室１〜５には、画像圧縮送信
装置１０と、画像圧縮受信装置１１，１２と会話検出部
１３−１を設ければよく、センタ２０には、最寄り２パ
ルス検出部２１−１ デマンドレフレッシュ信号送出部
２３．スイッチ制御部２２−１．スイッチ部２２−２を
設ければよいので、５地点会議システムとしては安価と
なる。In this way, each of the conference rooms 1 to 5 only needs to be provided with the image compression transmitter 10, the image compression receivers 11 and 12, and the conversation detector 13-1, and the center 20 is provided with the nearest two pulses. Detection unit 21-1 Demand refresh signal transmission unit 23. Switch control unit 22-1. Since it is only necessary to provide the switch section 22-2, the five-point conference system is inexpensive.
以上詳細に説明せる如く本発明によれば、会議室が多く
なっても、各会議室には、画像圧縮送信装置ＩＯと、画
像圧縮受信装置１１．１２と会話検出部１３−１を設け
ればよく、センタ２０には、最寄り２パルス検出部２’
１−１ 、デマンドレフレッシュ信号送出部２３．ス
イッチ制御部２２−１、スイッチ部２２−２を設ければ
よいので、多地点会議システムとしては安価となる効果
がある。As explained in detail above, according to the present invention, even if the number of conference rooms increases, each conference room can be provided with an image compression transmitter IO, an image compression receiver 11.12, and a conversation detector 13-1. If possible, the center 20 has two nearest pulse detectors 2'.
1-1, demand refresh signal sending unit 23. Since it is only necessary to provide the switch control section 22-1 and the switch section 22-2, the multipoint conference system has the effect of being inexpensive.
第１図は本発明の原理ブロック図、
第２図は本発明の実施例の５地点会議システムの要部の
ブロック図、
第３図は本発明の実施例の会議室の要部のブロック図、
第４図は本発明の実施例のセンタのブロック図、第５図
は本発明の実施例のデマンドレフレッシュ信号と送信画
像信号との関係を示す図、第６図は本発明の実施例の最
寄り２パルス検出部の最寄りパルス検出を示す図、
第７図は従来例の５地点会議システムの要部のブロック
図である。
図において、
１〜５は会議室、
１０は画像圧縮送信装置、
１１．１２は画像圧縮受信装置、
１３は信号送信手段、
１３−１は会話検出部、
２０はセンタ、
２１は検出手段、
２１−１最寄り２パルス検出部、
２２は分配送信手段、
２２−１はスイッチ制御部、
２２−２はスイッチ部、
３０はマイク、
３１はエンベロープ作成部、
３２は比較器、
３３はオン信号選択パルス出力部、
４０−１〜４５−１．４０−２〜４
スイツチ、
５０〜５５はバッファを示す。
５−２は切替Fig. 1 is a block diagram of the principle of the present invention. Fig. 2 is a block diagram of the main parts of a five-point conference system according to an embodiment of the invention. Fig. 3 is a block diagram of main parts of a conference room according to an embodiment of the invention. , FIG. 4 is a block diagram of the center according to the embodiment of the present invention, FIG. 5 is a diagram showing the relationship between the demand refresh signal and the transmitted image signal according to the embodiment of the present invention, and FIG. 6 is a diagram showing the relationship between the demand refresh signal and the transmitted image signal according to the embodiment of the present invention. FIG. 7 is a block diagram of the main parts of a conventional five-point conference system. In the figure, 1 to 5 are conference rooms, 10 is an image compression transmitter, 11.12 is an image compression receiver, 13 is a signal transmitter, 13-1 is a conversation detector, 20 is a center, 21 is a detector, 21 -1 nearest two pulse detection unit, 22 distribution transmission means, 22-1 switch control unit, 22-2 switch unit, 30 microphone, 31 envelope creation unit, 32 comparator, 33 ON signal selection pulse Output section, 40-1 to 45-1. 40-2 to 4 switch, 50 to 55 indicate buffer. 5-2 is switching
Claims (1)
伝送装置を用いテレビ画像を授受して会議を行う多地点
会議システムにおいて、 センタ（２０）を設け、 各会議室（１、２、３、・・）には、 該センタ（２０）に圧縮画像データを送信する画像圧縮
送信装置（１０）と、 該センタ（２０）よりの圧縮画像データを受信する２台
の画像圧縮受信装置（１１、１２）と、会議中を示す信
号を送信する信号送信手段（１３）とを備え、 該センタ（２０）には、 各会議室の信号送信手段（１３）より送られてくる信号
により互いに論議している２会議室を検出する検出手段
（２１）と、 検出された２会議室よりの圧縮画像データを、全会議室
の該２つの画像圧縮受信装置（１１、１２）に分配送信
する分配送信手段（２２）と、該検出手段（２１）にて
検出された会議室が変わると、変わった会議室の画像圧
縮送信装置（１０）に、初期状態から改めて送信し直す
デマンドレフレッシュ信号を送出するデマンドレフレッ
シュ信号送出手段（２３）とを設けたことを特徴とする
多地点会議システム。[Claims] In a multi-point conference system in which a conference is held between three or more conference rooms (1, 2, 3, etc.) by transmitting and receiving television images using an image compression transmission device, a center (20) is provided. Each conference room (1, 2, 3,...) is equipped with an image compression transmitter (10) that transmits compressed image data to the center (20), and an image compression transmitter (10) that transmits compressed image data from the center (20). The center (20) is equipped with two image compression receiving devices (11, 12) for receiving images, and a signal transmitting means (13) for transmitting a signal indicating that a conference is in progress. 13) Detection means (21) for detecting two conference rooms that are discussing with each other based on signals sent from the detector (21); When the conference room detected by the distribution transmission means (22) and the detection means (21) that distributes and transmits data to the devices (11, 12) changes, the initial image compression transmission device (10) of the new conference room is sent. A multipoint conference system comprising: demand refresh signal transmitting means (23) for transmitting a demand refresh signal to be retransmitted from a state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12803290A JPH0423588A (en) | 1990-05-17 | 1990-05-17 | Multi-point conference system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12803290A JPH0423588A (en) | 1990-05-17 | 1990-05-17 | Multi-point conference system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0423588A true JPH0423588A (en) | 1992-01-27 |
Family
ID=14974827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12803290A Pending JPH0423588A (en) | 1990-05-17 | 1990-05-17 | Multi-point conference system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0423588A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01286689A (en) * | 1988-05-13 | 1989-11-17 | Nec Corp | Multipoint picture transmitting system |
| JPH024095A (en) * | 1988-06-22 | 1990-01-09 | Nippon Telegr & Teleph Corp <Ntt> | Speaker deciding system for inter-multispot video conference |
| JPH0269088A (en) * | 1988-09-05 | 1990-03-08 | Fujitsu Ltd | Multilocation picture communication system |
-
1990
- 1990-05-17 JP JP12803290A patent/JPH0423588A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01286689A (en) * | 1988-05-13 | 1989-11-17 | Nec Corp | Multipoint picture transmitting system |
| JPH024095A (en) * | 1988-06-22 | 1990-01-09 | Nippon Telegr & Teleph Corp <Ntt> | Speaker deciding system for inter-multispot video conference |
| JPH0269088A (en) * | 1988-09-05 | 1990-03-08 | Fujitsu Ltd | Multilocation picture communication system |
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