CN1272932C - Distributed multimedia conference system based on IP network - Google Patents
Distributed multimedia conference system based on IP network Download PDFInfo
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- CN1272932C CN1272932C CN03127985.6A CN03127985A CN1272932C CN 1272932 C CN1272932 C CN 1272932C CN 03127985 A CN03127985 A CN 03127985A CN 1272932 C CN1272932 C CN 1272932C
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- 238000012545 processing Methods 0.000 claims abstract description 33
- 230000006870 function Effects 0.000 abstract description 17
- 230000006854 communication Effects 0.000 description 17
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- 238000000034 method Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 206010048669 Terminal state Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
- H04L12/1827—Network arrangements for conference optimisation or adaptation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
- H04L65/403—Arrangements for multi-party communication, e.g. for conferences
- H04L65/4038—Arrangements for multi-party communication, e.g. for conferences with floor control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
- H04L65/403—Arrangements for multi-party communication, e.g. for conferences
- H04L65/4046—Arrangements for multi-party communication, e.g. for conferences with distributed floor control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
- H04M2201/50—Telephonic communication in combination with video communication
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Abstract
The present invention relates to a distributed multi-medium conference system based on an IP network, which mainly comprises a multi-medium conference terminal, a multipoint control unit and a gatekeeper. The present invention is characterized in that the gatekeeper is divided into a junction gatekeeper and multi-user gatekeepers; each user gatekeeper is respectively connected with a multi-medium conference terminal and a multipoint control unit thereof; the junction gatekeeper is connected with each user gatekeeper and coordinates each user gatekeeper to manage a whole system. When a conference is carried out, each multi-medium conference terminal which participates in a conference is connected with a multipoint control unit controlling the multi-medium conference terminal; the multipoint control unit only has a multipoint control function and a multipoint processing function for separating from the multipoint control unit; the multipoint control units respectively realize the multipoint processing function of each multi-medium conference terminal. In addition, the present invention supports the multi-medium conference functions of images, voices, data, etc. Image, voice and data signals are transmitted in a multicasting mode, and the network bandwidth is saved.
Description
Affiliated technical field
The present invention relates to a kind of multimedia conference system of supporting in the IP operation network that operates in, particularly adopt distributed proccessing, realize big capacity multimedia conference system, this system both had been applicable to multipoint system, also be a plurality of participants that are positioned at the strange land and realize the system of multimedia conferencing function, be applicable to Point-to-Point system again, i.e. the system that carries out multimedia communication by two sides that are positioned at the strange land.
Background technology
Multimedia conference system couples together a plurality of multimedia conferencing terminals that are positioned at the strange land by communication network, under the control of multipoint control unit, allows the participant communicate with multimedia modes such as image, voice-and-datas.Multimedia conference system comprise multimedia conferencing terminal, multipoint control unit (Multi-pointControl Unit, MCU) and the gatekeeper (Gatekeeper, GK).Multimedia conferencing terminal and other terminal, multipoint control unit and gatekeeper carry out two-way communication, and support multimedia communications such as image, voice-and-data.Multipoint control unit provides the control to a plurality of multimedia conferencing terminals, and carries out the mixing and the exchange of image, voice-and-data, supports the multipoint conference of three above terminal rooms.In general, multipoint control unit is handled (MP) two functional modules by multiple spot control (MC) and multiple spot and is constituted, multiple spot control provides the control to multipoint conference, and multiple spot is handled multi-channel video, audio frequency and data-signal are handled, and multipoint processor is controlled by multipoint controller.The gatekeeper realizes the management function of system, comprises user management, conference management, equipment control and Bandwidth Management etc.
In existing multimedia conference system (as shown in Figure 1), multipoint control unit has not only been realized the multiple spot controlled function but also realized the multiple spot processing capacity, therefore, has following problem:
1. owing on multipoint control unit, realize the multiple spot processing capacity in a concentrated manner, the processing of multipoint control unit load is heavier, particularly more at system user, when carrying out a plurality of meeting simultaneously, just limit the scale of system, can't set up the large multimedia conference system;
2. when carrying out multipoint conference, the image that all participant terminals send, voice and data are all concentrated to multipoint control unit, after wherein the multiple spot processing module is carried out image and speech processes (speed, audio mixing etc. are handled, mixed to many pictures), mode with clean culture is forwarded to each participant terminal one by one again, shown in solid line among Fig. 1, certainly will cause multipoint control unit place node data flow bigger like this, take more bandwidth resources, particularly at the participant terminal quantity more for a long time, may cause network congestion when serious.
Summary of the invention
Technology of the present invention is dealt with problems and is: the distributed multimedia conference system that a kind of IP based network is provided, utilize it to set up jumbo multimedia conference system, the load of equalizing system equipment, rationally utilize network bandwidth resources, effectively reduce network load, solve the problems referred to above that existing multimedia conference system exists.
The technical solution adopted in the present invention is: the distributed multimedia conference system of IP based network, mainly comprise multimedia conferencing terminal, multipoint control unit and gatekeeper, it is characterized in that: described gatekeeper is divided into tandem gatekeeper and a plurality of user gatekeeper, each user network is law-abiding not to link to each other with multipoint control unit with its multimedia conferencing terminal of having jurisdiction over, the tandem gatekeeper links to each other with each user gatekeeper, and coordinate each user gatekeeper, manage whole system; Each multimedia conferencing terminal at one's leisure with its under user gatekeeper communicate and get in touch, during attending a meeting, except that establishing a communications link with affiliated user gatekeeper, also the multipoint control unit with this conference terminal of control establishes a communications link; Multipoint control unit only has the multiple spot controlled function, and its multiple spot processing capacity is separated from multipoint control unit, realizes the multiple spot processing capacity in each multimedia conferencing terminal respectively.
Among the present invention, by adopting the method for distributed treatment, the gatekeeper is divided into tandem gatekeeper and a plurality of user gatekeeper, a plurality of user gatekeepers realize the management function of system jointly under tandem gatekeeper's coordination; Simultaneously the multiple spot processing capacity is separated from multipoint control unit, be distributed to conference terminal, it is the exchange that multipoint control unit and each multimedia conferencing system terminal has only control stream, there is not the exchange of information code currents such as audio frequency and video, information code current is under the control of multipoint control unit, through corresponding route, between each multimedia terminal, transmit; The present invention in case of necessity is provided with a plurality of multipoint control units, and the load of balanced multipoint control unit can greatly expand the capacity of multimedia conference system like this, has solved the limited problem of existing centralized conference power system capacity.
Among the present invention, between each multimedia conferencing terminal, all signals all transmit by IP network between conference terminal and multipoint control unit, user gatekeeper and the tandem gatekeeper; And each conference terminal adopts multicast mode transmission tone video code flow.Multicast (Multicast) is a distinctive transmission technology in the IP network, it allow one or more senders (multicast source) disposable, simultaneously send single packet to a plurality of recipients.Multicast source sends packet with specific multicast address, and the member who only belongs to this multicast group just can receive packet.Multicast can greatly be saved the network bandwidth, because no matter what recipients are arranged, only transmits single packet on any link of whole network, and it has improved data-transmission efficiency, has reduced backbone network and congested possibility occurred.
Among the present invention, a plurality of user gatekeepers and tandem gatekeeper all can adopt the mode of two-node cluster hot backup, improve its reliability.
The beneficial effect that the present invention compared with prior art has is:
1, owing to adopts the method for distributed treatment, be about to the gatekeeper and be divided into a tandem gatekeeper and a plurality of user gatekeeper, and the multiple spot processing capacity separated from multipoint control unit, on the multimedia conferencing terminal, realize the multiple spot processing capacity, promptly the terminal by participant realizes functions such as many pictures are handled, mixed speed, audio mixing, this has just alleviated the processing load of multipoint control unit widely, and single multipoint control unit can be held more meeting simultaneously, supports more multimedia conferencing terminal works; Secondly, when setting up large scale system, can be according to the distribution situation of multimedia conferencing terminal, a plurality of multipoint control units are set, the tandem gatekeeper can be according to the distribution situation of the whole network meeting at each multipoint control unit, reasonable distribution meeting, the load-balancing function of realization multipoint control unit.
2, owing to adopt multicast mode transmission tone video code flow, and the multiple spot processing capacity is to realize on each conference terminal, therefore when holding a meeting, the image of Xuan Ding a certain conference terminal and sound are directly to all participant terminal multicasts as required, and needn't converge to multipoint control unit, multicast packet respectively to each multimedia meeting terminal transmission, has so just been saved the network bandwidth, the network congestion problem of having avoided centralized multimedia conference system to occur along corresponding route.
Description of drawings
Fig. 1 is the distributed architecture and the code stream control schematic diagram of centralized multimedia conference system in the prior art;
Fig. 2 is a logical construction distribution schematic diagram of the present invention;
Fig. 3 is a code stream control schematic diagram of the present invention;
Fig. 4 is the communication process schematic diagram between each equipment of the present invention;
Fig. 5 is a multimedia conferencing terminal structure theory diagram of the present invention;
Fig. 6 is the multiple spot control module in the multimedia conferencing terminal and gatekeeper's a theory diagram among Fig. 5;
Fig. 7 is the structure topo graph of one embodiment of the invention.
Embodiment
As shown in Figure 2, the present invention is made up of a tandem gatekeeper 101, a plurality of user gatekeeper 1021-102n (n is more than or equal to 2) cascade, a plurality of multipoint control unit MCU 1031-103n (n is more than or equal to 2) cascade, a plurality of multimedia conferencing terminal 1041-104n (n is more than or equal to 2), tandem gatekeeper 101 and each user gatekeeper 1021-102n establish a communications link, and coordinates user gatekeeper 1021-102n, the management whole system; Simultaneously each user gatekeeper 1021-102n is in charge of the multimedia conferencing terminal 1041-104n and the multipoint control unit MCU 1031-103n of its corresponding administration of institute, and sets up the two-way communication connection; Each multimedia conferencing terminal 1041-104n at one's leisure with its under user gatekeeper 1021-102n set up two-way communication and be connected, during participating in a conference, except that connecting with user gatekeeper 1021-102n, also establish a communications link simultaneously with the multipoint control unit of controlling this meeting, and each multimedia conferencing terminal 1041-104n also has multiple spot processing MP function, promptly the audio-video signal that other terminal can be sent carries out processing such as many pictures, audio mixing, mixed speed, so its main feature is can realize the multiple spot processing capacity simultaneously; Multipoint control unit MCU during holding multipoint conference to each conference terminal 1041 '-104n controls, and image, voice signal are switched, and realizes the function of multiple spot control MC.A plurality of multipoint control unit MCU can be set, to realize load balancing in the system.
As shown in Figure 3, in the session, multimedia conferencing terminal 104n as broadcast site removes and other terminal 1041-104n-1, multipoint control unit 103n and the user gatekeeper 1026 under it as this meeting of control carry out two-way communication, support voice, outside the multimedia application such as image and data, increase multiple spot and handled the MP function, promptly the audio-video signal that other terminal can be sent carries out many pictures, processing such as audio mixing, and also adopt multicast mode transmission tone video code flow to other terminal 1041-104n-1, shown in Fig. 3 solid line as the multimedia conferencing terminal 104n of broadcast site; Simultaneously, multipoint control unit 103n only is responsible for the exchange of control stream, shown in Fig. 3 dotted line, does not have the exchange of audio-video code stream, has alleviated the processing load of multipoint control unit 103n so widely.
As shown in Figure 5, each multimedia conferencing terminal 1041-104n mainly comprises video source 401, audio-source 402, audio frequency and video input interface 403, audio/video coding 408, audio/video decoding 409, audio and video output interface 404, public address equipment 405, display device 406 and network interface 410 etc., its characteristics are: increasing between audio/video decoding 409 and audio and video output interface 404 has multiple spot processing capacity module 407, and each multimedia conferencing terminal 1041-104n also has multiple spot processing MP function like this.Video source 401 and audio-source 402 are looked input interface 403 with image, voice and the data-signal in local meeting-place through sound, deliver to audio/video coding 408 and carry out processing such as compressed encoding back and sent in the IP network by network interface 410; Simultaneously, the various information such as audio frequency and video that receive by IP network, behind network interface 410, deliver to audio/video decoding 409 processing such as decode, be reduced into image, voice and data-signal, after image, voice and data-signal after will being reduced by multiple spot processing 407 again carries out processing such as many pictures, audio mixing, arrive public address equipment 405 and display device 406 through audio and video output interface 404.
The course of work of the present invention is as follows:
Shown in Fig. 2,3,4, after multimedia conferencing terminal 1041-104n starts, at first with its under user gatekeeper 1021-102n set up two-way communication and be connected, as shown in Figure 3, to user gatekeeper 1021-102n application login, this user gatekeeper is to the authenticating identity of this terminal, if this terminal is by subscription authentication, then login successfully, can use native system; Otherwise this terminal can not be used native system.The fail safe that the subscription authentication function of system can the assurance system be used prevents the unauthorized user using system.
Each user gatekeeper 1021-102n obtains this user for information about in the subscription authentication process, as user identity sign indicating number, user name, IP address etc., each user gatekeeper 1021-102n according to user identity sign indicating number inquiry local data base, confirms whether the user is authorized user again.If authorized user, then upgrade this user's relevant information, as user name, IP address, User Status etc.This user's of user network garrison general lastest imformation uploads to tandem gatekeeper 101, and tandem gatekeeper 101 Dynamic Maintenance update user information databases pass to other user gatekeeper under the information with lastest imformation then, and other user gatekeeper upgrades state of user information.By said process, tandem gatekeeper 101 and each user gatekeeper 1021-102n can monitor, upgrade and manage system-wide user state information real-time dynamicly.
After the multimedia conferencing terminal is logined successfully, can use native system, the process of holding a meeting is as follows:
The multimedia conferencing terminal 104n that need hold a meeting as broadcast site at first to the predetermined meeting that will hold of user gatekeeper 102n.The user comprises information such as meeting title, meeting start time, meeting duration, meeting overview and participant member by conference terminal 104n input conferencing information.Conference terminal 104n is sent to user gatekeeper 102n under it with meeting information, this user gatekeeper 102n is according to the strategies such as load condition of each multipoint control unit MCU in participant member's the distribution in system, the system, for this meeting distributes a multipoint control unit MCU, MCU controls this meeting by this multipoint control unit.This meeting relevant information of user network garrison general is added in the local conferencing information database, simultaneously the conferencing information that upgrades is uploaded to tandem gatekeeper 101.Tandem gatekeeper 101 is transmitted the conferencing information of renewal to other user gatekeeper in update system conferencing information database.By said process, tandem gatekeeper 101 and each user gatekeeper 1021-102n can upgrade and safeguard system-wide conferencing information real-time dynamicly.
When the terminal 104n of initiation meeting will hold the meeting of reserving in advance, at first set up two-way communication and be connected, call out each participant joining meeting to terminal by multipoint control unit MCU with the multipoint control unit MCU of this meeting.Multipoint control unit MCU all set up two-way communication with the participant terminal that adds meeting and was connected this moment, shown in dotted line among 3 figure.After adding meeting, the participant terminal still keeps communicating to connect with separately user gatekeeper, so that in real time to the variation of user gatekeeper's reporting terminal state information.For example, after the adding meeting, the state of each participant terminal becomes " participant " by " free time ", at this moment, each the participant terminal initiatively user gatekeeper's report condition under it changes, and user gatekeeper upgrades local user's state information, uploads the user state information of renewal to tandem gatekeeper 101 simultaneously.Behind the tandem gatekeeper 101 update system user state information databases, pass to other user gatekeeper under the user state information that will upgrade again, the user state information that guarantees all gatekeepers dynamically, upgrade in real time.
During the progress of the meeting, the multipoint control unit MCU of this meeting can be according to the requirement of the terminal that has the meeting control, the control multipoint conference, for example, selected certain can field picture harmony sound to other meeting-place broadcasting, right to speak distributed to the meeting-place that needs speech etc.Multipoint control unit MCU controls MC to the multiple spot that is controlled to be of a plurality of participant terminals, is to realize the multiple spot controlled function, must keep two-way communication to connect between multipoint control unit MCU and the participant terminal, and exchange control and response message, as Fig. 3 dotted line and shown in Figure 4.
As shown in Figure 6, multiple spot processing unit 1031-103n is made of primary processor CPU 701, internal memory 702, I/O interface 705, large-capacity storage media 704, other physical interface 703, network interface 706.
Need carry out processing such as many pictures, audio mixing to the audio-video signal of a plurality of terminals in the session, be referred to as multiple spot and handle MP.The multiple spot processing capacity does not realize on multipoint control unit MCU among the present invention, but each with conference terminal 1041-104n on realize, as shown in Figure 5, be about to the multiple spot processing capacity and separate, realize the meeting of multiple spot processing capacity by each participant terminal 1041-104n respectively from multipoint control unit MCU.As shown in Figure 3, in distributed conference system of the present invention, has only the exchange of control and response message between multipoint control unit MCU and the participant terminal 1041-104n, shown in Fig. 3 dotted line, control and response message occupied bandwidth are very little, every road mean value is about the order of magnitude of 100b/s, therefore the communication load of multipoint control unit MCU and processing load are all very light, it can support more terminal, form jumbo conference system, solved the limited problem of existing centralized conference power system capacity.
Native system is when meeting adjourned, controls this meeting multipoint control unit MCU and each participant terminal 1041-104n and all disconnects and communicating to connect, and each participant terminal 1041-104n returns to idle condition, only keeps communicating to connect with separately user gatekeeper 1021-102n.
As shown in Figure 7, be one embodiment of the present of invention: adopt certain multimedia conference system of the invention process.This system is made up of tandem gatekeeper, user gatekeeper, multipoint control unit MCU, a plurality of multimedia conferencing terminal and corresponding router, and the physical location of these equipment in network without limits.The quantity of user gatekeeper, MCU, conference terminal, router and ethernet segment is not limit, and can be two or more.Tandem gatekeeper, user gatekeeper, MCU, conference terminal and router are linked into local ethernet by Ethernet interface.Each ethernet segment links to each other by the IP transmission network through router.Logically, tandem gatekeeper and user gatekeeper are one and are independent of multipoint control unit MCU and multimedia conferencing terminal, but can be included in when physics realization in multipoint control unit MCU and the multimedia conferencing terminal, its tandem gatekeeper and user gatekeeper's running software are on multipoint control unit MCU server.The implementation procedure of describing in the concrete course of work of present embodiment and the above-mentioned embodiment is identical.
In addition, adopt technical scheme of the present invention also can realize teleeducation system, Telemedicine System, frequency image monitoring system.
Claims (9)
1, the distributed multimedia conference system of IP based network, mainly comprise multimedia conferencing terminal, multipoint control unit and gatekeeper, it is characterized in that: described gatekeeper is divided into tandem gatekeeper and a plurality of user gatekeeper, each user network is law-abiding not to link to each other with multipoint control unit with its multimedia conferencing terminal of having jurisdiction over, be in charge of multimedia conferencing terminal and multipoint control unit that it is had jurisdiction over, the tandem gatekeeper links to each other with each user gatekeeper, and coordinates each user gatekeeper, the management whole system; During the progress of the meeting, the multimedia conferencing terminal of each participant also links to each other with the multipoint control unit of this meeting of control; Multipoint control unit only has the multiple spot controlled function, and the multiple spot processing capacity is separated from multipoint control unit, realizes the multiple spot processing capacity in each multimedia conferencing terminal respectively.
2, distributed multimedia conference system according to claim 1 is characterized in that: described user gatekeeper is more than 2 or 2.
3, distributed multimedia conference system according to claim 1 and 2 is characterized in that: described tandem gatekeeper or a plurality of user gatekeeper all can adopt the mode of two-node cluster hot backup, improve its reliability.
4, distributed multimedia conference system according to claim 1 is characterized in that: described multipoint control unit, only realize the multipoint conference controlled function.
5, distributed multimedia conference system according to claim 4 is characterized in that: described multipoint control unit is more than 2 or 2.
6, distributed multimedia conference system according to claim 1 or 5 is characterized in that: described multipoint control unit, under tandem gatekeeper and each user gatekeeper's support, realize the equilibrium of meeting control load.
7, distributed multimedia conference system according to claim 1 is characterized in that: described each multimedia conferencing terminal also has the multiple spot processing capacity.
8, distributed multimedia conference system according to claim 1 is characterized in that: between described each multimedia conferencing terminal, all signals all transmit by IP network between conference terminal and multipoint control unit, user gatekeeper and the tandem gatekeeper.
9, according to claim 1 or 7 described distributed multimedia conference systems, it is characterized in that: described each multimedia conferencing terminal adopts multicast mode images, voice-and-data signal.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03127985.6A CN1272932C (en) | 2003-04-28 | 2003-04-28 | Distributed multimedia conference system based on IP network |
| AU2003289613A AU2003289613A1 (en) | 2003-04-28 | 2003-12-17 | Distributed multimedia conference system based on ip web |
| PCT/CN2003/001080 WO2004098125A1 (en) | 2003-04-28 | 2003-12-17 | Distributed multimedia conference system based on ip web |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03127985.6A CN1272932C (en) | 2003-04-28 | 2003-04-28 | Distributed multimedia conference system based on IP network |
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| CN1543123A CN1543123A (en) | 2004-11-03 |
| CN1272932C true CN1272932C (en) | 2006-08-30 |
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| CN03127985.6A Expired - Fee Related CN1272932C (en) | 2003-04-28 | 2003-04-28 | Distributed multimedia conference system based on IP network |
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| CN (1) | CN1272932C (en) |
| AU (1) | AU2003289613A1 (en) |
| WO (1) | WO2004098125A1 (en) |
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| CN100542099C (en) * | 2003-11-24 | 2009-09-16 | 王生安 | A kind of multipoint control unit and based on the shared method and the conference system of IP network |
| JP4300238B2 (en) * | 2005-05-18 | 2009-07-22 | 日本電信電話株式会社 | Distributed multimedia server system, multimedia information distribution method, program thereof, and recording medium |
| CN100544269C (en) * | 2006-07-18 | 2009-09-23 | 中兴通讯股份有限公司 | A kind ofly realize not supporting gatekeeper's endpoint device to participate in the method for multipoint conference |
| CN101707687B (en) * | 2009-11-10 | 2013-01-16 | 中兴通讯股份有限公司 | Video conference service dispatching method and video conference system |
| DE102009057725A1 (en) | 2009-12-10 | 2011-06-16 | Siemens Enterprise Communications Gmbh & Co. Kg | Signaling device, signaling device, signaling method and signaling method |
| CN102572368A (en) * | 2010-12-16 | 2012-07-11 | 中兴通讯股份有限公司 | Processing method and system of distributed video and multipoint control unit |
| CN102890936A (en) * | 2011-07-19 | 2013-01-23 | 联想(北京)有限公司 | Audio processing method and terminal device and system |
| CN102957729B (en) * | 2011-08-26 | 2015-11-25 | 中国移动通信集团公司 | A kind of multimedia conferencing audio/video transmission method and equipment |
| CN102843289B (en) * | 2012-08-08 | 2015-05-27 | 苏州阔地网络科技有限公司 | Meeting drift method and system |
| CN103313027A (en) * | 2013-06-08 | 2013-09-18 | 青岛优视通网络有限公司 | Conference terminal strong in network adaptability and method for realizing video conferences |
| CN104009991B (en) * | 2014-05-28 | 2017-09-01 | 广州华多网络科技有限公司 | Audio communication system and method |
| CN105391969A (en) * | 2015-12-14 | 2016-03-09 | 广东亿迅科技有限公司 | Distributed video conference system and terminal conference participating method |
| CN105635628A (en) * | 2016-01-22 | 2016-06-01 | 深圳市华玺科技有限公司 | Backpack type individual access video conference method and system |
| CN108156413B (en) * | 2017-12-28 | 2021-05-11 | 中兴通讯股份有限公司 | Video conference transmission method and device and MCU |
| CN111372033B (en) * | 2020-04-11 | 2021-01-19 | 高邮市新世纪灯具城经营管理有限公司 | Video conference management method and system |
| CN113347431A (en) * | 2021-04-15 | 2021-09-03 | 昆明学院 | Image communication device and method for communication terminal |
| CN115695661A (en) * | 2022-09-27 | 2023-02-03 | 北京佳讯飞鸿电气股份有限公司 | Distributed voice conference system |
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| DE60043773D1 (en) * | 1999-02-09 | 2010-03-18 | Ericsson Telefon Ab L M | DEVICE FOR DISTRIBUTION ALLOCATING IN PARTICULAR H.323 GENERIC TRANSPORT |
| CN1190079C (en) * | 2002-03-29 | 2005-02-16 | 武汉邮电科学研究院 | Soft exchange based video conference system multipoint controller |
| CN1214635C (en) * | 2002-05-10 | 2005-08-10 | 华为技术有限公司 | Conference dispatching system and method of IP network meeting TV-set |
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2003
- 2003-04-28 CN CN03127985.6A patent/CN1272932C/en not_active Expired - Fee Related
- 2003-12-17 WO PCT/CN2003/001080 patent/WO2004098125A1/en not_active Application Discontinuation
- 2003-12-17 AU AU2003289613A patent/AU2003289613A1/en not_active Abandoned
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| WO2004098125A1 (en) | 2004-11-11 |
| AU2003289613A1 (en) | 2004-11-23 |
| CN1543123A (en) | 2004-11-03 |
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