CN101668162B - Implementation method of video conference and video conference system - Google Patents
Implementation method of video conference and video conference system Download PDFInfo
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Abstract
The invention discloses an implementation method of a video conference and a video conference system. The implementation method of the video conference comprises: voice terminals respectively have interaction with a media resource server (MRS) through a public switched telephone network so as to realize audio transmission among the voice terminals; conference control terminals respectively have interaction with a video conference server through internet so as to realize video transmission among the conference control terminals; wherein all the conference control terminals respectively correspond to all the voice terminals; and video signals coming from the video conference server are blended with audio signals coming from the MRS through the conference control terminals. The invention separated the transmission of the video signals and the audio signals in the video conference, thus relieving the limitation of network bandwidth for the video conference to a large extent and improving the quality of the video conference.
Description
Technical field
The present invention relates to the communications field, more specifically, relate to a kind of implementation method and video conferencing system of video conference.
Background technology
Video conferencing system is meant by existing various electric communication transmission mediums, multiple data such as personage's quiet, dynamic image, voice, literal, picture are distributed on each user's computer, make that the user that disperses geographically can copolymerization one place, by multiple mode exchange of information such as figure, sound, increase the understandability of both sides to content.
Present various video conferencing system can be found everywhere, the kind of video conferencing system can be divided into following a few class according to the different criteria for classifying: divide according to number of meeting attendants, video conferencing system is divided into two kinds of point-to-point (2 people) and group's video conferencing systems (many people) on user's compositional model; Be divided into simulation (for example, utilizing closed circuit cable television system to realize the one-way video meeting) and digital (for example, realizing) two kinds by technical implementation way by software and hardware computer and mechanics of communication.
Along with popularizing and prosperity day by day of network, the video conferencing system that realizes in the digital technology mode has become main flow.
Video conferencing system has following demand to using environment: because the video conferencing system transmission is multi-medium data, different with general data, and the data volume of the source signal of sound and dynamic image is bigger, so can't directly transmit on the digital circuit of general condition.Simultaneously, based on the requirement to practical effect, also need the sound that transmits and picture signal continuously and level and smooth, other miscellaneous functions are used simple and direct.Therefore, reach above-mentioned effect, system has carried out standard to the existing standard of sound/image compression, communication line condition and video conferencing system (for example, the ITU of International Telecommunications Union look voice communication and compatible technology thereof).In these basic agreements, simultaneously the coded format of voice, video has been carried out relevant regulation with important documents such as user's control models.The standard that is applicable to video conference that ITU-T formulates has: H.320 agreement (being used for the group's video conference on the integrated services digital network), H.323 agreement (being used for the desktop conference on the local area network (LAN)), H.324 agreement (being used for the video conference on the telephone network) and agreement (being used for the video conference on asynchronous transfer mode and the broadband integrated services digital network) H.310.Wherein, H.323 agreement has become the most general consensus standard at present.
At present, the audio ﹠ video in the video conferencing system causes transmission quality not high generally by internet transmission easily, and phenomenon such as interruption is arranged.
Summary of the invention
The technical problem that the present invention will solve provides a kind of implementation method of video conference, can improve the transmission quality of video conference.
The invention provides a kind of implementation method of video conference, comprising: each voice terminal by public switch telephone network respectively and Media Resource Server alternately to realize the audio transmission between each voice terminal; Each can control terminal by the Internet respectively and videoconference server alternately to realize each video transmission between can control terminal, wherein, each is can control terminal corresponding with each voice terminal respectively; Can merge by control terminal by each from the vision signal of videoconference server and audio signal from Media Resource Server; Before described each voice terminal carries out audio transmission by described Media Resource Server, respectively described each voice terminal is added video conference; Wherein, described each can control terminal comprise caller meeting control terminal and participant meeting control terminal, described each voice terminal comprise the caller voice terminal corresponding with described caller meeting control terminal and with the corresponding participant voice terminal of described participant meeting control terminal; The described step that respectively described each voice terminal is added video conference comprises: described caller meeting control terminal is initiated the video conference request to application server; Described application server makes a call to described caller voice terminal by described Trunk Media Gateway/SGW after receiving described video conference request; Behind described caller voice terminal off-hook, described application server sends invitation message to described Media Resource Server, indicates described Media Resource Server that described caller voice terminal is added described video conference; Described application server sends invitation message to described participant voice terminal; Behind described participant voice terminal off-hook, described application server sends invitation message to described Media Resource Server, indicates described Media Resource Server that described participant voice terminal is added described video conference.
According to an embodiment of implementation method of the present invention, each voice terminal by public switch telephone network respectively and Media Resource Server comprise with the step that realizes the audio transmission between each voice terminal alternately: each voice terminal is sent to Media Resource Server with audio signal separately respectively by public switch telephone network and Trunk Media Gateway/SGW; Media Resource Server carries out audio mixing to a plurality of audio signals that receive, and the audio signal behind the audio mixing is transmitted to each voice terminal respectively.
According to another embodiment of implementation method of the present invention, each can control terminal by the Internet respectively and videoconference server comprise with the step that realizes each video transmission between can control terminal alternately: each can be sent to videoconference server with the vision signal that collects respectively by the Internet by control terminal; A plurality of vision signals that videoconference server will receive are transmitted to each respectively can control terminal.
According to the another embodiment of implementation method of the present invention, this method also comprises: before each meeting control terminal is sent to videoconference server with the vision signal that collects respectively, respectively each can be added video conference by control terminal.
According to an embodiment again of implementation method of the present invention, the step that each meeting control terminal is added video conference comprises respectively: caller meeting control terminal is created video conference to the http server application; After creating video conference, http server returns video conference information to caller meeting control terminal; Caller meeting control terminal sends to server of instant message with the video conference information that receives; Server of instant message sends the video invite message of carrying video conference information by Session Initiation Protocol to participant meeting control terminal; After participant meeting control terminal receives video invite message, send the request that adds video conference to videoconference server; Videoconference server adds video conference with participant meeting control terminal after the request of receiving the adding video conference that participant meeting control terminal sends.
According to an embodiment again of implementation method of the present invention, video conference information comprises videoconference server IP address, meeting number, meeting password, host's password, unit sign and unit key.
The implementation method of video conference provided by the invention is separated video by the PSTN transmitting audio signal and by the internet transmission vision signal with transmission of audio signals.This method can improve the experience effect of the phonological component in the video conferencing system by PSTN, reduces the volume of transmitted data of the Internet simultaneously, thereby reaches the video tastes effect of requirement.
Another technical problem that the present invention will solve provides a kind of video conferencing system, can improve the transmission quality of video conference.
The invention provides a kind of video conferencing system, comprise a plurality of voice terminals and a plurality of meeting control terminals corresponding with a plurality of voice terminals, this system also comprises Media Resource Server, be used for by public switch telephone network respectively and a plurality of voice terminal alternately to realize the audio transmission between a plurality of voice terminals; Videoconference server, be used for by the Internet respectively and a plurality of can control terminal alternately to realize a plurality of video transmissions between can control terminals; A plurality of meeting control terminals are used to receive the vision signal from videoconference server, receive the audio signal from Media Resource Server, and vision signal and audio signal are merged; A plurality of meeting control terminals comprise caller meeting control terminal and participant meeting control terminal; This system also comprises: application server is used for carrying out alternately respectively a plurality of voice terminals are added video conference with Media Resource Server and a plurality of voice terminal; Http server, be used to accept video conference request that caller meeting control terminal initiates, create video conference and with the video conference feedback information to caller meeting control terminal; Server of instant message is used to receive the video conference information from caller meeting control terminal, and the video invite message that will carry video conference information sends to participant meeting control terminal by Session Initiation Protocol, so that participant meeting control terminal is added video conference; Trunk Media Gateway is used for changing mutually from the audio signal of a plurality of voice terminals with from the IP bag of Media Resource Server; SGW is used for changing mutually from the IP bag of the Internet with from the signaling of public switch telephone network.
According to another embodiment of video conferencing system of the present invention, video conference information comprises videoconference server IP address, meeting number, meeting password, host's password, unit sign and unit key.
Video conferencing system provided by the invention, realize transmission of audio signals in the video conference by public switch telephone network, and realize transmission of video signals in the video conference by the Internet, thereby the realization audio signal is separated with video signal transmission, has further improved and improved the transmission quality of video conference.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of first embodiment of video conference implementation method of the present invention.
Fig. 2 is a schematic flow sheet of setting up audio transmission in the video conference implementation method of the present invention.
Fig. 3 is a schematic diagram of setting up video transmission in the video conference implementation method of the present invention.
Fig. 4 is the structural representation of first embodiment of video conferencing system of the present invention.
Fig. 5 is the structural representation of second embodiment of video conferencing system of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.Exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, but do not constitute improper qualification of the present invention.
Fig. 1 is the schematic flow sheet of first embodiment of video conference implementation method of the present invention.
As shown in Figure 1, this method comprises:
S102, each voice terminal by public switch telephone network respectively and Media Resource Server alternately to realize the audio transmission between each voice terminal;
Particularly, each voice terminal is sent to Media Resource Server with audio signal separately respectively by public switch telephone network and Trunk Media Gateway/SGW; Media Resource Server carries out audio mixing to a plurality of audio signals that receive, and the audio signal behind the audio mixing is transmitted to each voice terminal respectively to realize the audio transmission between each voice terminal again.
S104, each can control terminal by the Internet respectively and videoconference server alternately to realize each video transmission between can control terminal, wherein, each is can control terminal corresponding with each voice terminal respectively;
Particularly, each can be sent to videoconference server with the vision signal that collects respectively by the Internet by control terminal; A plurality of vision signals that videoconference server will receive are transmitted to each meeting control terminal respectively to realize the video transmission between each meeting control terminal.
S106, can merge by control terminal by each from the vision signal of videoconference server and audio signal from Media Resource Server, promptly, each meeting control terminal is realized the synchronized transmission and the reception of audio ﹠ video, interactively video is seamlessly added on the audio frequency, thus effective fusion of realization video and audio frequency.
Before each voice terminal carries out audio transmission by Media Resource Server, each voice terminal need be added video conference, idiographic flow is as follows:
Caller meeting control terminal is initiated the video conference request to application server, and wherein, each can comprise caller meeting control terminal and participant meeting control terminal by control terminal;
Application server is after receiving the video conference request, make a call to the caller voice terminal by Trunk Media Gateway/SGW, wherein, each voice terminal comprises caller voice terminal corresponding with caller meeting control terminal and the corresponding participant voice terminal of participant meeting control terminal;
Behind caller voice terminal off-hook, application server sends invitation message to Media Resource Server, and the indication Media Resource Server adds video conference with the caller voice terminal;
Application server sends invitation message to the participant voice terminal;
Behind participant voice terminal off-hook, application server sends invitation message to Media Resource Server, and the indication Media Resource Server adds video conference with the participant voice terminal.
Before each meeting control terminal carries out video transmission by videoconference server, also need each can be added video conference by control terminal, idiographic flow is as follows:
Caller meeting control terminal is created video conference to http server (HTTP SERVER) application;
After creating video conference, http server returns video conference information to caller meeting control terminal;
Caller meeting control terminal sends to server of instant message with the video conference information that receives;
Server of instant message sends the video invite message of carrying video conference information by SIP (Session Initiation Protocol, SIP) agreement to participant meeting control terminal;
After participant meeting control terminal receives video invite message, send the request that adds video conference to videoconference server;
Videoconference server adds video conference with participant meeting control terminal after the request of receiving the adding video conference that participant meeting control terminal sends.
Fig. 2 is a schematic flow sheet of setting up audio transmission in the video conference implementation method of the present invention.
As shown in Figure 2, may further comprise the steps:
S202, the request that caller meeting control terminal is held a meeting to AS (Application Server, application server) initiation;
S204, S206, AS sends INVITE by SS (Soft Switch, soft switch) and TG/SG (Trunk Gateway/Signaling Gateway, Trunk Media Gateway/SGW) to the telephone terminal A with the binding of caller meeting control terminal;
S208, S210, behind the employed telephone terminal A of the host off-hook, telephone terminal A returns 200OK by SS, carry the A Session Description Protocol (Session Description Protocol, SDP);
S212, AS sends INVITE to MRS (Media Resource Server, Media Resource Server), carries the A Session Description Protocol, and indication MRS adds the meeting-place with telephone terminal A;
S214, MRS returns 200OK to AS, carries the Media Resource Server Session Description Protocol;
S216, AS sends ACK to MRS, shows to receive 200OK message;
S218, S220, AS returns ACK by the Internet and SS to telephone terminal A, carries the Media Resource Server Session Description Protocol;
S222 is put into into the meeting-place prompt tone to telephone terminal A by MRS;
S224, AS can report the meeting Flushing status by control terminal to each;
S226, S228, AS sends INVITE by SS and TG/SG to participant telephone terminal B;
S230, S232 behind the participant telephone terminal B off-hook, returns 200OK by SS to AS, carries the B Session Description Protocol;
S234, AS sends INVITE to MRS, carries the B Session Description Protocol, and indication MRS adds the meeting-place with participant telephone terminal B;
S236, MRS returns 200OK to AS, carries the Media Resource Server Session Description Protocol;
S238, AS sends ACK to MRS, shows to receive 200OK message;
S240, S242, AS returns ACK by SS to participant telephone terminal B, carries the Media Resource Server Session Description Protocol;
S244 is put into into the meeting-place prompt tone to participant telephone terminal B by MRS;
S246, AS to each can control terminal report meeting Flushing status, wait each participant terminal all to add meeting after, meeting begins.
In the transmission of audio signals process, there is not Media Stream mutual between each conference member, but by medium all are sent to MRS, by MRS all called carrying out are returned to each conference member behind the medium audio mixing again, realize that a plurality of conference members converse simultaneously, simultaneously the state of each voice terminal being returned to each can control terminal.
The voice signal of the 64kbit/s that above-mentioned TG will transmit from telephone exchange PCM (Pulse Code Modulation, pulse-code modulation) relaying is converted into the IP bag, and this media signal can be transmitted in the internet network.Simultaneously, this TG can also be converted into the IP bag signal that transmits from MRS the voice signal of 64kbit/s, makes this media signal send to voice terminal by public switch telephone network.
The Signaling System Number 7 information based on TDM (Time Division Multiplex, time division multiplexing) circuit that above-mentioned SG adopts telephone exchange is converted into the IP bag, and it can be transmitted in the internet network.Simultaneously, the IP bag that this SG can also come the internet Network Transmission is converted into Signaling System Number 7 information, makes it be transferred to voice terminal by public switch telephone network.
Above-mentioned MRS and the transmission of the signal between the TG/SG are finished by the internet network.
Signal transmission between TG/SG and the voice terminal is that public switch telephone network is finished.
Fig. 3 is a schematic diagram of setting up video transmission in the video conference implementation method of the present invention.
As shown in Figure 3, may further comprise the steps:
Caller meeting control terminal is initiated the video conference request, and caller meeting control terminal to meeting room resource of http server (SERVER) application, is created a video conference by XML (Extensible Markup Language, extend markup language) agreement;
HTTP SERVER sends feedback information to caller meeting control terminal after finishing the establishment of video conference, and this feedback information comprises videoconference server ip address, meeting number, meeting password, host's password, the ID of unit and unit key;
The information package that caller meeting control terminal feeds back HTTP SERVER becomes the form of instant message to send IM (Instant Message, instant message) server to;
The IM server sends the video message request by Session Initiation Protocol to other participant meeting control terminals, and this video message request comprises videoconference server IP address, meeting number, meeting password, host's password, the ID of unit and unit key;
After other participant meeting control terminals are received above-mentioned video message request it is unpacked, and send the request that adds video conference to video server;
Videoconference server is receiving that the request back sends the message of successfully adding conference member to all participant meeting control terminals;
Each can collect image and image is sent to videoconference server by video equipment by control terminal;
Videoconference server is distributed to each with video flowing can control terminal.
Fig. 4 is the structural representation of first embodiment of video conferencing system of the present invention.
As shown in Figure 4, this system comprises: a plurality of voice terminals 41 and a plurality of meeting control terminals 42 corresponding with a plurality of voice terminals, Media Resource Server 43, be used for by public switch telephone network respectively and a plurality of voice terminal alternately to realize the audio transmission between a plurality of voice terminals; Videoconference server 44, be used for by the Internet respectively and a plurality of can control terminal alternately to realize a plurality of video transmissions between can control terminals; A plurality of meeting control terminals are used to receive the vision signal from videoconference server, receive the audio signal from Media Resource Server, and vision signal and audio signal are merged.That is to say, a plurality of voice terminals 41 are to send audio signal to Media Resource Server 43 respectively by public switch telephone network rather than by the Internet, undertaken sending a plurality of voice terminals more respectively to behind the audio mixing by Media Resource Server 43, thereby realize the audio transmission between a plurality of voice terminals.A plurality of meeting control terminals 42, can be transmitted by control terminals to a plurality of by videoconference server to videoconference server 44 transmission vision signals by the Internet again, thereby realize the video transmission between a plurality of meeting control terminals.At last, can realize the synchronized transmission and the reception of voice and video respectively by control terminal by a plurality of again, thereby merge video and the audio signal of transmitting respectively in the video conference effectively.
Fig. 5 is the structural representation of second embodiment of video conferencing system of the present invention.
As shown in Figure 5, this embodiment compares with embodiment among Fig. 4 have been increased: application server 51 is used for carrying out alternately respectively a plurality of voice terminals are added video conferences with Media Resource Server and a plurality of voice terminal; Http server 52, be used to accept video conference request that caller meeting control terminal initiates, create video conference and with the video conference feedback information to caller meeting control terminal; Server of instant message 53 is used to receive the video conference information from caller meeting control terminal, and the video invite message that will carry video conference information sends to participant meeting control terminal by Session Initiation Protocol, so that participant meeting control terminal is added video conference; Trunk Media Gateway 54 is used for changing mutually from the audio signal of a plurality of voice terminals with from the IP bag of Media Resource Server; SGW 55 is used for changing mutually from the IP bag of the Internet with from the signaling of public switch telephone network.
Wherein, video conference information comprises videoconference server IP address, meeting number, meeting password, host's password, unit sign and unit key.
Through the above description of the embodiments, those skilled in the art can be well understood to each execution mode and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware.Based on such understanding, the part that technique scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the computer-readable recording medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, perhaps network equipment etc.) carry out the described method of some part of each embodiment or embodiment.
In sum, the present invention separates the vision signal in the video conference with transmission of audio signals, and this has alleviated the restriction of the network bandwidth for video conference to a great extent, has improved the quality of video conference.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are conspicuous for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (8)
1. the implementation method of a video conference is characterized in that, described method comprises:
Each voice terminal by public switch telephone network respectively and Media Resource Server alternately to realize the audio transmission between described each voice terminal;
Each can control terminal by the Internet respectively and videoconference server alternately to realize described each video transmission between can control terminal, wherein, described each is can control terminal corresponding with described each voice terminal respectively;
Can merge by control terminal by described each from the vision signal of described videoconference server and audio signal from described Media Resource Server;
Before described each voice terminal carries out audio transmission by described Media Resource Server, respectively described each voice terminal is added video conference;
Wherein, described each can control terminal comprise caller meeting control terminal and participant meeting control terminal, described each voice terminal comprise the caller voice terminal corresponding with described caller meeting control terminal and with the corresponding participant voice terminal of described participant meeting control terminal;
The described step that respectively described each voice terminal is added video conference comprises:
Described caller meeting control terminal is initiated the video conference request to application server;
Described application server makes a call to described caller voice terminal by described Trunk Media Gateway/SGW after receiving described video conference request;
Behind described caller voice terminal off-hook, described application server sends invitation message to described Media Resource Server, indicates described Media Resource Server that described caller voice terminal is added described video conference;
Described application server sends invitation message to described participant voice terminal;
Behind described participant voice terminal off-hook, described application server sends invitation message to described Media Resource Server, indicates described Media Resource Server that described participant voice terminal is added described video conference.
2. method according to claim 1 is characterized in that, described each voice terminal by public switch telephone network respectively and Media Resource Server comprise with the step that realizes the audio transmission between described each voice terminal alternately:
Described each voice terminal is sent to described Media Resource Server with audio signal separately respectively by described public switch telephone network and Trunk Media Gateway/SGW;
Described Media Resource Server carries out audio mixing to a plurality of audio signals that receive, and the audio signal behind the audio mixing is transmitted to described each voice terminal respectively.
3. method according to claim 2 is characterized in that, described each can control terminal by the Internet respectively and videoconference server comprise with the step that realizes described each video transmission between can control terminal alternately:
Described each can be sent to described videoconference server with the vision signal that collects respectively by described the Internet by control terminal;
A plurality of vision signals that described videoconference server will receive are transmitted to described each meeting control terminal respectively.
4. method according to claim 3 is characterized in that, described method also comprises:
Before described each meeting control terminal is sent to described videoconference server with the vision signal that collects respectively, respectively described each can be added described video conference by control terminal.
5. method according to claim 4 is characterized in that, the described step that respectively described each meeting control terminal is added described video conference comprises:
Described caller meeting control terminal is created described video conference to the http server application;
After creating described video conference, described http server returns video conference information to described caller meeting control terminal;
The described video conference information that described caller meeting control terminal will receive sends to server of instant message;
Described server of instant message sends the video invite message of carrying described video conference information by Session Initiation Protocol to described participant meeting control terminal;
After described participant meeting control terminal receives described video invite message, send the request that adds described video conference to described videoconference server;
Described videoconference server adds described video conference with described participant meeting control terminal after the request of receiving the described video conference of adding that described participant meeting control terminal sends.
6. method according to claim 5 is characterized in that, described video conference information comprises videoconference server IP address, meeting number, meeting password, host's password, unit sign and unit key.
7. a video conferencing system comprises a plurality of voice terminals and a plurality of meeting control terminals corresponding with described a plurality of voice terminals, it is characterized in that described system also comprises:
Media Resource Server, be used for by public switch telephone network respectively and described a plurality of voice terminal alternately to realize the audio transmission between described a plurality of voice terminal;
Videoconference server, be used for by the Internet respectively and described a plurality of can control terminal alternately to realize described a plurality of video transmission between can control terminal;
Described a plurality of meeting control terminal is used to receive the vision signal from described videoconference server, receives the audio signal from described Media Resource Server, and described vision signal and audio signal are merged; Described a plurality of meeting control terminal comprise caller meeting control terminal and participant meeting control terminal;
Described system also comprises:
Application server is used for carrying out alternately respectively described a plurality of voice terminals are added video conference with described Media Resource Server and described a plurality of voice terminal;
Http server is used to accept video conference request that described caller meeting control terminal initiates, creates described video conference and give described caller meeting control terminal with the video conference feedback information;
Server of instant message, be used to receive described video conference information from described caller meeting control terminal, and the video invite message that will carry described video conference information sends to described participant meeting control terminal by Session Initiation Protocol, so that described participant meeting control terminal is added described video conference;
Trunk Media Gateway is used for changing mutually from the audio signal of described a plurality of voice terminals with from the IP bag of described Media Resource Server;
SGW is used for changing mutually from the IP bag of described the Internet with from the signaling of described public switch telephone network.
8. system according to claim 7 is characterized in that, described video conference information comprises videoconference server IP address, meeting number, meeting password, host's password, unit sign and unit key.
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2009
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