CN101646057A - Remote-presence conference control device, method and remote-presence conference system - Google Patents

Abstract

The invention discloses a remote-presence conference control device, a method and a remote-presence conference system; the system comprises video end equipment, a video interchange unit, a plurality of conference terminals, and at least one control unit; wherein the video interchange unit is used for leading an audio and/or video signal collected locally to be output to the conference terminal, and receiving a signal output by the conference terminal to transmit to the video end equipment, and the switching-over of the audio and/or video signal is carried out according to the indication of thecontrol unit; the control unit is used for indicating the video interchange unit to switch over the signal on the conference terminal with fault to the conference terminal without fault. As the videointerchange unit is additionally arranged, when determining a certain conference terminal to have faults, the control unit can indicate the video interchange unit to switch over the signal on the conference terminal with fault to the conference terminal without fault, thereby improving the reliability of the remote-presence conference system.

Description

A kind of control device of remote presentation conference, method and remote presentation conference system

Technical field

The present invention relates to internet arena, relate in particular to a kind of control device, method and remote presentation conference system of remote presentation conference.

Background technology

Existing multi-screen remote presentation conference system all is that the form that adopts a plurality of video conference terminals to bundle a plurality of peripheral hardwares (as multiple TV set and a plurality of video camera) constitutes a meeting-place, the image that every like this road video camera is taken is sent to far-end behind the terminal coding of correspondence, terminal is exported through corresponding display after receiving the far-end code stream decoding, can realize so also solving eye to a certain extent to eye interchange problem near true man's size.

With the remote presentation conference of the prior art system that comprises three conference terminals is example, and its annexation comprises three conference terminals, control unit and the audio-visual end-equipment of three covers as shown in Figure 1, wherein:

This control unit can be connected to this three conference terminals, and optionally is connected to display, video camera etc., the control of concentrating, the annexation of not drawing among Fig. 1;

These three conference terminals are connected with external network by circuit 1 to 3 respectively, and be connected with the audio-visual end-equipment of a cover respectively, be used to finish the video/audio encoding and decoding function, but not all conference terminal all needs to finish complete codec functions, can just realize part of functions wherein, for example only coding or only decoding;

Audio-visual end-equipment comprises display, video camera, the microphone that contains loud speaker, and wherein, display can be display devices such as liquid crystal, CRT, plasma, perhaps projecting apparatus; Microphone can be directive property Mike, omni-directional Mike or array microphone etc.; Video camera can be three video cameras that separate, or three video cameras that are integrated together;

The circuit that these three conference terminals are connected with external network can use various wired or wireless access forms such as E1/Ethernet/xDsl/SDH/xPON/WiFi/WCDMA, and circuit 1, circuit 2, circuit 3 also can be the access forms that has nothing in common with each other.

The inventor finds that there are the following problems at least in the prior art: the mode of above-mentioned multi-screen remote presentation conference is with respect to traditional system, owing to increased video conference terminal and peripheral hardware number, the complexity of system and individual meeting site all sharply rises, reliability is low, can not satisfy the demand of actual use.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of control device, method and remote presentation conference system of remote presentation conference, in order to improve the reliability of remote presentation conference.

To achieve these goals, the embodiment of the invention provides a kind of remote presentation conference system, comprises audio-visual end-equipment, audio-visual crosspoint, a plurality of conference terminal, at least one control unit, wherein:

Described audio-visual end-equipment, be used to carry out local at least one group of audio frequency and/or collection of video signal, and audio frequency and/or vision signal that this locality collects exported to described audio-visual crosspoint, and play audio frequency and/or the vision signal that receives from described audio-visual crosspoint;

Described conference terminal, the external audio and/or the video data that are used for obtaining from external network are exported to described audio-visual crosspoint, and will export to described external network from audio frequency and/or vision signal that described audio-visual crosspoint obtains;

Described audio-visual crosspoint, the audio frequency and/or the vision signal that are used for described this locality is collected are exported to described conference terminal, and the signal that receives the output of described conference terminal sends to described audio-visual end-equipment, and carries out the switching of audio frequency and/or vision signal according to the indication of described control unit;

Described control unit is used to indicate described audio-visual crosspoint the signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down.

The embodiment of the invention also provides a kind of control device of remote presentation conference, is applied to comprise in the remote presentation conference system of a plurality of conference terminals, comprises audio-visual crosspoint and control unit, wherein,

Described audio-visual crosspoint, the audio frequency and/or the vision signal that are used for described this locality is collected are exported to described conference terminal, and the signal that receives the output of described conference terminal sends to audio-visual end-equipment, and carries out the switching of audio frequency and/or vision signal according to the indication of described control unit;

Described control unit is used to indicate described audio-visual crosspoint the signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down.

The embodiment of the invention also provides a kind of method of remote presentation conference, be applied to comprise in the remote presentation conference system of a plurality of conference terminals, may further comprise the steps: detect whether fault of described conference terminal, and when determining described conference terminal fault, the signal on the conference terminal that breaks down is switched to the conference terminal that does not break down.

The beneficial effect of the embodiment of the invention is:

Remote presentation conference system in the embodiment of the invention has increased audio-visual crosspoint, this audio-visual crosspoint can be controlled the interconnection of any video/audio signal, therefore, when control unit is determined certain conference terminal fault, can indicate audio-visual crosspoint that the signal on the conference terminal that breaks down is switched to the conference terminal that does not break down, thereby ensure the operate as normal of whole remote presentation conference system.As can be seen, the remote presentation conference system in the present embodiment compares with remote presentation conference of the prior art system, has reliability better.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the block diagram that comprises the remote presentation conference of the prior art system of three conference terminals;

Fig. 2 is the reliability model schematic diagram of remote presentation conference individual meeting site system;

Fig. 3 is the block diagram of the remote presentation conference system among the embodiment one;

Fig. 4 is the block diagram of the remote presentation conference system among the embodiment two;

Fig. 5 looks audio exchange matrix schematic diagram for example among the embodiment two when initial;

Fig. 6 looks audio exchange matrix schematic diagram after for conference terminal 3 faults in the example shown in Figure 5;

Fig. 7 is the block diagram of the remote presentation conference system among the embodiment three;

Fig. 8 is the block diagram of the remote presentation conference system among the embodiment four;

Fig. 9 is the comparison diagram of the reliability of remote presentation conference system dependability among the embodiment four and remote presentation conference of the prior art system;

Figure 10 is the distribution schematic diagram of the video camera among the embodiment six;

Figure 11 is the distribution schematic diagram of the projecting apparatus among the embodiment seven;

Figure 12 is the schematic diagram of realizing among the embodiment seven replacement of projecting apparatus 1102;

Figure 13 is the comparison diagram by the reliability of the reliability of the remote presentation conference system in the embodiment of the invention after the optimization of the foregoing description one to eight and traditional unit/terminal conference system;

Figure 14 presents the block diagram of the control device of meeting for embodiment nine medium-long ranges;

Figure 15 is the flow chart of the control method of the remote presentation conference among the embodiment ten.

Embodiment

For ease of analyzing contrast, set up the reliability model of remote presentation conference individual meeting site system earlier.Have only when each subsystem work that constitutes the remote presentation conference system just often, whole system is operate as normal, therefore each subsystem is equivalent to series connection, as shown in Figure 2, comprise line subsystem, conference terminal subsystem, display subsystem, camera subsystem, speaker subsystem, microphone subsystem, terminal software subsystem, middle control subsystem in the system of remote presentation conference individual meeting site.

In existing remote presentation conference system, a plurality of equipment that constitute each subsystem also need all working properly, and subsystem could operate as normal, so a plurality of equipment in the subsystem also form series relationship.For ease of analyzing, meeting terminal software subsystem is branched away separately.Because the software section relative reliability of microphone, loud speaker, video camera, display, middle control etc. is higher or do not have software, therefore, can ignore in stability analysis.

Line subsystem is mainly considered the professional use of line fault influence, comprise line interruption, the circuit error rate surpasses instructions for use etc., its reliability is assumed to be one and evenly distributes, the reliability of software subsystem also is assumed to be one and evenly distributes, the inefficacy of other subsystems is mainly hardware failure and causes, its reliability hypothesis obeys index distribution.

The telepresence system that table 1 constitutes for three conference terminals shown in Figure 1 carries out reliability according to above-mentioned model and distributes the dependability parameter that obtains:

Table 1

Wherein, the t express time, the formula that obtains MTBF (Mean Time Between Failures, mean time between failures (MTBF)) is:

$\mathrm{MTBF}={\∫}_0^{\∞}R\left(t\right)\mathrm{dt}---\left(1\right)$

R (t)=e ^{-λ t}The time, formula (1) is changed to:

$\mathrm{MTBF}={\∫}_0^{\∞}{e}^{-\mathrm{\λt}}\mathrm{dt}=1/\mathrm{\λ}---\left(2\right)$

λ＝1//MTBF?????????????(3)

Wherein, display estimates according to general LCD, if use projection, CRT (Cathode Ray Tube, cathode ray tube) then MTBF have bigger difference.

The reliability that is numbered 1～6 subsystem can be passed through formula (4) and obtain:

$R_{1-6}\left(t\right)=\underset{i=1}{\overset{6}{\mathrm{\Π}}}{R}_i\left(t\right)={(e^{{-10}^{-4}t}\×e^{-\frac{1}{3}{10}^{-4}t}\×e^{-\frac{1}{3}{10}^{-4}t}\×e^{-\frac{1}{6}{10}^{-4}t}\×e^{-\frac{1}{6}{10}^{-4}t})}^3\×e^{-\frac{1}{2}{10}^{-4}t}=e^{-6.5\×{10}^{-4}t}---\left(4\right)$

The reliability of whole system can be passed through formula (5) (6) and obtain:

$R_s\left(t\right)=\underset{i=1}{\overset{8}{\mathrm{\Π}}}{R}_i\left(t\right)=R_{1-6}\left(t\right)\×R_7\left(t\right)\×R_8\left(t\right)=e^{-6.5\×{10}^{-4}t}\×{\left(0.999\right)}^3\×{\left(0.995\right)}^3=0.982123\×e^{-6.5\×{10}^{-4}t}---\left(5\right)$

In contrast, can set up the parameter that is equipped with in the use table 1, the MTBF that calculates traditional TV conference system (in traditional TV conference system, the quantity of conference terminal, display, video camera, microphone, loud speaker, circuit is 1, no central control system) is:

Also promptly the MTBF of existing remote presentation conference system has only about 30% of traditional TV conference system.The reliability that the prior art medium-long range presents each subsystem and whole system in the conference system changes as shown in table 2:

Table 2

X days	??10	??20	??40	??60	??80	??100	??160	??200
									The conference terminal subsystem	??0.9305	??0.8659	??0.7498	??0.6492	??0.5621	??0.4868	??0.3160	??0.2369
Display subsystem	??0.9763	??0.9531	??0.9085	??0.8659	??0.8253	??0.7866	??0.6811	??0.6188
									Camera subsystem	??0.9763	??0.9531	??0.9085	??0.8659	??0.8253	??0.7866	??0.6811	??0.6188
Speaker subsystem	??0.9881	??0.9763	??0.9531	??0.9305	??0.9085	??0.8869	??0.8253	??0.7866
									The microphone subsystem	??0.9881	??0.9763	??0.9531	??0.9305	??0.9085	??0.8869	??0.8253	??0.7866
Middle control subsystem	??0.9881	??0.9763	??0.9531	??0.9305	??0.9085	??0.8869	??0.8253	??0.7866
									The conference terminal software subsystem	??0.9970	??0.9970	??0.9970	??0.9970	??0.9970	??0.9970	??0.9970	??0.9970
Line subsystem	??0.9851	??0.9851	??0.9851	??0.9851	??0.9851	??0.9851	??0.9851	??0.9851
									System's (total)	??0.8403	??0.7189	??0.5262	??0.3852	??0.2819	??0.2064	??0.0809	??0.0434

As can be seen, the existing remote presentation conference system mean free error time has only 63 days, and when accumulation work in the time of 40 days, system dependability has been reduced to about 53%, obviously can't satisfy the requirement of highly reliable conference system.

Under the situation that the discontinuous start of existing remote presentation conference system is used, its reliability is as shown in table 3:

Table 3

X the end of month	??1	??2	??4	??6	??8	??10	??12	??14	??16	??18	??20	??22	??24
														Reliability	??0.94	??0.90	??0.83	??0.77	??0.70	??0.65	??0.60	??0.55	??0.50	??0.46	??0.43	??0.39	??0.36

As seen,, supposed to start shooting every day 4 hours even actual conditions are not that start is used continuously, start in every month 16 days, equivalent MTBF is about 24 months, and in the time of the 16th month, reliability has been reduced to 50%, and the reliability of system does not meet the demands yet.

What by analytical table 2 as can be seen, system reliability is had the greatest impact is the conference terminal subsystem.Therefore, in embodiments of the present invention, at first improve at the conference terminal subsystem.

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is described in detail.

Embodiment one

Remote presentation conference system in the present embodiment as shown in Figure 3, comprise that three conference terminals ( conference terminal 3011,3012,3013), an audio-visual crosspoint 302, three overlap audio-visual end-equipment (audio-visual end- equipment 3031,3032,3033) and control units 304, wherein:

Audio-visual end- equipment 3031,3032,3033, be used to carry out local audio frequency and/or collection of video signal, and audio frequency and/or vision signal that this locality collects exported to audio-visual crosspoint 302, and play audio frequency and/or the vision signal that receives from audio-visual crosspoint 302;

Conference terminal 3011,3012,3013, be used for exporting to audio-visual crosspoint 302 behind the external audio that will obtain from external network and/or the video data decoding, and export to external network behind audio frequency that will obtain from audio-visual crosspoint 302 and/or the video signal coding;

Audio-visual crosspoint 302, the audio frequency and/or the vision signal that are used for this locality is collected are exported to conference terminal 3011,3012,3013, and the signal that receives conference terminal 3011,3012,3013 outputs sends to audio-visual end- equipment 3031,3032,3033, and carries out the switching of audio frequency and/or vision signal according to the indication of control unit 304;

Control unit 304 is used for indicating audio-visual crosspoint 302 signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down when any one or two faults of conference terminal 3011,3012,3013.

Wherein, audio-visual end- equipment 3031,3032,3033 can comprise one of following end-equipment or combination in any:

The video acquisition end-equipment is used to gather vision signal, for example video camera;

The audio collection end-equipment is used to gather audio signal, for example microphone;

Video output end-equipment is used to play the vision signal that receives, for example the display on the television set;

Audio frequency output end-equipment is used to play the audio signal that receives, for example the loud speaker on the television set.

Control unit 304 is except with audio-visual crosspoint 302 is connected, can also be connected to this three conference terminals 3011,3012,3013, and optionally be connected to display, video camera etc., the control of concentrating, this part the annexation of not drawing among Fig. 3.

Compare with remote presentation conference of the prior art system, remote presentation conference system in the present embodiment has increased audio-visual crosspoint 302, this audio-visual crosspoint 302 can be controlled the interconnection of any video/audio signal, therefore, when control unit 304 is determined certain conference terminal fault, can indicate audio-visual crosspoint 302 signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down, so, for example, conference terminal 3012 breaks down, then control unit 304 can indicate audio-visual crosspoint 302 to handle by conference terminal 3012 originally and the signal of transmission switches on conference terminal 3011 or the conference terminal 3013, and then whole remote presentation conference system still can operate as normal.Under extreme case, as long as there is the conference terminal can operate as normal, then whole system also may operate as normal.As can be seen, the remote presentation conference system in the present embodiment compares with remote presentation conference of the prior art system, has reliability better.

When specific implementation, the number of conference terminal is not necessarily identical with the tricks of audio-visual end-equipment in the remote presentation conference system, for example, in an example, the remote presentation conference system comprises the three audio-visual end-equipment of cover and four conference terminals, these four conference terminals can be operated in the load sharing pattern, such as being focused on a conference terminal, three tunnel decodings finish, other three conference terminals are finished three road codings, after certain conference terminal fault, again with encoding and decoding Task Distribution to three conference terminal (at this moment may cause coding/decoding capability to descend, be downgraded to 25 frames) such as coding frame per second 30 frames.Distribute and switch indication and can finish, be provided with, then also can finish by merging the conference terminal that is provided with control unit if control unit and conference terminal merge by control unit.

Embodiment two

Remote presentation conference system in the present embodiment as shown in Figure 4, compare with the remote presentation conference system among the embodiment one, remote presentation conference system in the present embodiment comprises four conference terminals (conference terminal 3011,3012,3013,3014), and wherein conference terminal 3014 is standby conference terminals.In the present embodiment, control unit 304 is when determining certain conference terminal fault of using, can activate standby conference terminal 3014, and indicate audio-visual crosspoint 302 that the audio frequency and/or the vision signal of the conference terminal that breaks down are switched to standby conference terminal 3014, thereby constitute reliability k/n voting subsystem (k=3, n=4), when specific implementation, this k value not necessarily tricks with audio-visual end-equipment is identical, for example, have in system under the situation of the audio-visual end-equipment of three covers, can think that wherein the audio-visual end-equipment of a cover is reliable all the time, and only the audio-visual end-equipment of other two covers is increased a standby terminal, promptly the k value is 2, constitutes reliability 2/3 voting subsystem.When standby conference terminal 3014 is activated, if (for example working as the fault conference terminal was connected with far-end before fault to need to connect distance terminal, and after switching, some information that standby terminal can not recover the fault conference terminal fully are when being connected, need reconnect distance terminal), then control unit 304 notifies standby conference terminal 3014 to reconnect distance terminal.

In the remote presentation conference system in embodiment one, under the situation of conference terminal fault, the remote presentation conference system can continue operate as normal, but, because after certain conference terminal fault, the conference terminal that does not break down can be born more treating capacity, and too much treating capacity may cause the reliability decrease of each conference terminal, therefore, in the present embodiment, increase standby conference terminal, make after certain conference terminal fault, each remaining conference terminal still bears follows suitable treating capacity before, further ensures the reliability of remote presentation conference system.

In the present embodiment, three masters all establish a communications link with control unit 304 with conference terminal ( conference terminal 3011,3012,3013) and standby conference terminal 3014, determine by control unit 304 whether each conference terminal breaks down, and control unit 304 determines that the method whether each conference terminal breaks down can comprise following two kinds:

One, mainly detects self whether fault with conference terminal ( conference terminal 3011,3012,3013), and when detecting faults itself, send switching command to control unit 304, control unit 304 is determined main with conference terminal ( conference terminal 3011,3012,3013) fault when receiving this switching command.

Two, main with conference terminal ( conference terminal 3011,3012,3013) regularly (such as 1 second) send heartbeat signals (handshake) to control unit 304, control unit 304 is not received in certain hour (such as 5 seconds) when certain master uses the heartbeat signal of conference terminal, is determined that this master uses the conference terminal fault.

When specific implementation, can use above-mentioned two kinds simultaneously determines main with the conference terminal method of fault whether, use the following of above-mentioned two kinds of methods at the same time, control unit 304 is all determined to lead when receiving this switching command or when not receiving main heartbeat signal with conference terminal within a certain period of time and is used the conference terminal fault.

When control unit 304 switches to standby conference terminal at the audio-visual crosspoint 302 of indication with the audio frequency of the conference terminal that breaks down and/or vision signal, specifically can indicate the signal of video camera that audio-visual crosspoint 302 connects the fault conference terminal, display, microphone, loud speaker all to switch to standby conference terminal 3014, and as required, control this standby conference terminal 3014 and connect with far-end.In order to improve the configuration of interoperability and simplification remote equipment, control unit 304 can be when definite conference terminal fault, the configuration information of the conference terminal that utilization is broken down is configured standby conference terminal 3014, be specifically as follows control unit 304 before the audio-visual crosspoint 302 of indication carries out the switching of audio frequency and/or vision signal, the configuration information of fault terminal (is comprised the conference terminal sign, codec parameters, the IP address, even MAC (Medium Access Control Layer, media access control layer) address etc.) is issued to standby conference terminal 3014, make that the configuration of standby conference terminal 3014 and fault conference terminal is just the same, be convenient to the operation of remote equipment.

In a preferred embodiment, control unit 304 can further be integrated into conference terminal 3011,3012,3013, in 3014, for example, control unit 304 merges setting with one of them conference terminal, except that control fault is switched, also can manage other controlled devices by remote controller, and for example, conference terminal 3011,3012,3013,3014 all merge and are provided with control unit 304, except that control fault is switched, also can pass through conference terminal 3011,3012,3013,3014 built-in Web servers, use browser to be connected to conference terminal 3011 by PC (PersonalComputer, personal computer), 3012,3013,3014 manage other equipment.Like this control unit 304 can be set separately, improve reliability.

When specific implementation, a plurality of conference terminals all can be finished the function of control unit, and corresponding formation is to the k/n voting belief system of control unit.

In order to finish fault detect better, control unit 304 can merge setting with standby conference terminal 3014, finish fault detect and indication switching by standby conference terminal 3014, for example three main regularly send heartbeat and handoff request to standby conference terminal 3014 with conference terminals 3011,3012,3013, standby conference terminal 3014 receive certain main with conference terminal handoff request or do not receive that certain then definite this master of main heartbeat with conference terminal uses the conference terminal fault for a long time.And in order to improve the configuration of interoperability and simplification remote equipment, standby conference terminal 3014 is when 304 merging are provided with control unit, can obtain three main configuration informations in advance with terminal 3011,3012,3013, when this standby conference terminal 3014 switches to mainly when using conference terminal, self is configured with the configuration information of fault conference terminal.

When audio-visual crosspoint 302 switches to standby conference terminal 3014 in the audio frequency of the conference terminal that will break down and/or vision signal, can adopt and look the audio exchange matrix audio frequency and/or vision signal are switched, looking the audio exchange matrix is that 12 * 12 road switch units (are looked the audio mix interface comprising one 4 the tunnel, as HDMI (High Definition Multimedia Interface, the digital high-definition multimedia interface), reality has been used 10 tunnel inputs, 11 tunnel outputs.In an example, comprise conference terminal 1,2,3,4, conference terminal 1,2,3 operate as normal when initial, look the audio frequency annexation as shown in Figure 5 between each audio-visual end-equipment and the conference terminal 1,2,3, horizontal line is an incoming line among Fig. 5, and vertical line is an outlet line, represents to have carried out interconnection with solid dot, wherein, television set comprises display and loud speaker.After 1 conference terminal (supposing conference terminal 3) fault wherein, controlling audio-visual switching matrix switches, with the be connected disconnection of meeting terminal 3 with other equipment, meeting terminal 4 looked audio interface switches to and video camera, microphone, equipment such as television set connect, after Fig. 6 shows conference terminal 3 faults, look the audio frequency annexation after switching to the video/audio signal on the meeting terminal 3 on the conference terminal 4, as can be seen, video/audio signal on the meeting terminal 3 switched to specifically comprise on the conference terminal 4 input of the video of meeting terminal 3 and audio frequency input are switched in the video input and audio frequency input of conference terminal 4, meeting terminal 3 is looked audio frequency be outputted to conference terminal 4 and look in the audio frequency output.Above-mentioned conference terminal 1,2,3,4 can be understood that the conference terminal 3011,3012,3013,3014 among Fig. 4 respectively.

Embodiment three

In the present embodiment, make certain improvements at line subsystem.In existing remote presentation conference system, each conference terminal is connected with external network respectively, and any line fault all can cause the system failure, and reliability is low.If directly every circuit is backed up, then can cause spare line very many.Therefore, in the present embodiment, between conference terminal and external network, increase network exchange unit, be connected to external network by at least two circuits, be used to carry out the transfer of data between external network and the conference terminal, these two circuits are relation in parallel, constitute reliability subsystem in parallel, promptly wherein during a line fault, an other circuit still can ensure the transfer of data between external network and the network exchange unit.For the situation that Ethernet inserts, network exchange unit can use Ethernet switch equipment to realize.

Fig. 7 shows the situation that increases network exchange unit 305 and be connected to external network by circuit 1 and circuit 2 in remote presentation conference system shown in Figure 4.

Wherein, circuit 1 can be connected to different external networks with circuit 2, also can be different physical interfaces, such as being connected respectively to Ethernet and SDH (Synchronous Digital Hierarchy, synchronous digital hierarchy) network.

Circuit 1 and circuit 2 wherein one can be used as the main circuit of using, another is as extension wire, in this case, network exchange unit 305 can be used for when described master uses line fault, activate extension wire, make the reliability of line subsystem improve, whether network exchange unit 305 is at detection line during fault, the concrete content that detects can comprise physical layer, link layer, network layer connectedness and error code, packet loss etc., can be such as the network layer connectedness by sending ICMP (Internet Control MessageProtocol to gateway, Internet Control Message Protocol) message detects, and switches to extension wire after the master is with line fault.Detection to error code, packet loss also can directly be added up by conference terminal, the result is fed back to internet exchange system finish the circuit switching.

Line subsystem also can be operated in the load sharing pattern, be that circuit 1 and circuit 2 are worked simultaneously, signal sends at circuit 1 and circuit 2 interfaces by certain strategy (such as be mapped to circuit 1 and circuit 2 according to source MAC), when network exchange unit 305 is used for therein a line fault, the signal that transmits on the circuit that breaks down is switched on the circuit that does not break down.This mode can the better utilization line bandwidth, when circuit 1 and circuit 2 all are Ethernet interface, can adopt ripe switch ports themselves to converge the binding that technology (IEEE 802.3ad) realizes two line ports.

Remote presentation conference system in the present embodiment is owing to increased network exchange unit 305, therefore, each conference terminal can be connected with external network by network exchange unit 305, and network exchange unit 305 is as long as get final product operate as normal having a circuit and external network to communicate, therefore, in the present embodiment, when improving circuit reliability, can not cause the too much situation of circuit.

Embodiment four

Middle control subsystem fault will cause whole system thoroughly unavailable, in the present embodiment, make certain improvements at middle control subsystem.Reliability for control subsystem in improving, can increase the number of control unit, remote presentation conference system as shown in Figure 8 compares with remote presentation conference system shown in Figure 7, the number of control unit has become two, be respectively control unit 3041 and control unit 3042, control unit 3041 and control unit 3042 are except being connected respectively to the audio-visual crosspoint 302 shown in the figure, be also connected to each conference terminal 3011,3012,3013,3014, and optionally be connected to each audio-visual end- equipment 3031,3032,3033 controls to concentrate, this part annexation of not drawing among Fig. 8.

Can be connected (as Ethernet, RS232 etc.) by various communication links between control unit 3041,3042 and the controlled device, be that example describes with the Ethernet in the present embodiment.

In the present embodiment, control unit 3041 and control unit 3042 can be divided into the active and standby control unit of using, for example, control unit 3041 is the main control unit of using, control unit 3042 is standby control unit, active and standbyly all connect by Ethernet switch and each conference terminal equipment with control unit, active and standby using between control unit also by Ethernet interface communication, when the master uses control unit 3041 faults, activate standby control unit 3042, standby control unit 3042 is notified each controlled device after being activated, each controlled device is controlled.

Standby control unit 3042 determines that main method with control unit 3041 faults can comprise following two kinds:

One, mainly detect self whether fault with control unit 3041, and when detecting faults itself, send switching commands to standby control unit 3042, standby control unit 3042 is determined main with control unit 3041 faults when receiving this switching command.

Two, the master regularly sends heartbeat signals (handshake) to standby control unit 3042 with control unit 3041, and standby control unit is not received in 3042 certain hours when the master uses the heartbeat signal of control unit 3041, determines main with control unit 3041 faults.

When specific implementation, can use above-mentioned two kinds of methods of determining main with the control unit fault simultaneously, use at the same time under the situation of above-mentioned two kinds of methods, standby control unit 3042 is all determined main with control unit 3041 faults when receiving this switching command or when not receiving main heartbeat signal with control unit 3041 within a certain period of time.

In the present embodiment, if each controlled device is supported the connection management of a plurality of control units, then two control units can be controlled each controlled device simultaneously, such control unit fault can not influence the another one control unit yet and continue control, like this, control unit 3041 and control unit 3042 have been realized the parallel reliability model of central control system.

Now the reliability of remote presentation conference system shown in Figure 8 is analyzed, suppose that network exchange unit 305 and audio-visual crosspoint 302 are reliable, conference terminal and corresponding software thereof constitute reliability 3/4 voting subsystem respectively, network exchange unit 305 is two circuits in parallel with circuit between the external network, two control units are relation in parallel, the quantity of display, video camera, loud speaker, microphone is 3, and is relation in parallel mutually.Then the reliability of each subsystem is distributed as shown in table 4:

Table 4

Conference terminal subsystem (subsystem 1) and conference terminal software subsystem (subsystem 7) reliability are respectively:

$R_1\left(t\right)=\underset{i=k}{\overset{n}{\mathrm{\Σ}}}{C}_n^i{R}^i\left(t\right){[1-R\left(t\right)]}^{n-i}=4R^3\left(t\right)[1-R\left(t\right)]+R^4\left(t\right)=4R^3\left(t\right)-3R^4\left(t\right)---\left(8\right)$

$=4\×e^{-3\×{10}^{-4}t}-3\×e^{-4\×{10}^{-4}t}$

$R_7\left(t\right)=\underset{i=k}{\overset{n}{\mathrm{\Σ}}}{C}_n^i{R}^i\left(t\right){[1-R\left(t\right)]}^{n-i}=4R^3\left(t\right)[1-R\left(t\right)]+R^4\left(t\right)=4R^3\left(t\right)-3R^4\left(t\right)---\left(9\right)$

$=4\×{\left(0.999\right)}^3-3\×{\left(0.999\right)}^4=0.999994$

The reliability of subsystem 2～6 is:

$R_{2-6}\left(t\right)=\underset{i=2}{\overset{6}{\mathrm{\Π}}}{R}_i\left(t\right)={(e^{-\frac{1}{3}{10}^{-4}t}\×e^{-\frac{1}{3}{10}^{-4}t}\×e^{-\frac{1}{6}{10}^{-4}t}\×e^{-\frac{1}{6}{10}^{-4}t})}^3\×[1-{(1-e^{-\frac{1}{2}{10}^{-4}t})}^2]$

$=2\×e^{-3.5\×{10}^{-4}t}-e^{-4\×{10}^{-4}t}---\left(10\right)$

Subsystem 8 reliabilitys are:

R ₈(t)＝1-[1-R(t)] ²＝1-(1-0.995) ²＝0.999975????????(11)

The whole system reliability is:

$R_s\left(t\right)=\underset{i=1}{\overset{8}{\mathrm{\Π}}}{R}_i\left(t\right)=R_1\left(t\right)R_{2-6}\left(t\right)\×R_7\left(t\right)\×R_8\left(t\right)$

$=(4\×e^{-3\×{10}^{-4}t}-3\×e^{-4\×{10}^{-4}t})\×(2\×e^{-3.5\×{10}^{-4}t}-e^{-4\×{10}^{-4}t})\×0.999994\×0.999975$

$=0.999969\×(8\×e^{-6.5\×{10}^{-4}t}-4\×e^{-7\×{10}^{-4}t}-6\×e^{-7.5\×{10}^{-4}t}+3\×e^{-8\×{10}^{-4}t})---\left(12\right)$

The MTBF that is not difficult to calculate whole system is:

As can be seen, the MTBF (63 days) of the MTBF remote presentation conference of the prior art relatively system of the remote presentation conference system of present embodiment has improved 55%.The contrast of the reliability of the reliability of the remote presentation conference system of present embodiment and remote presentation conference of the prior art system is as shown in table 5:

Table 5

X days	??10	??20	??40	??63	??80	??98	??160
								Prior art is reliable	??0.84	??072	??0.53	??0.37	??028	??0.21	??0.08
The present embodiment reliability	??0.93	??0.85	??0.71	??0.57	??0.48	??0.39	??0.19

As can be seen, remote presentation conference of the prior art system, after 40 days, system dependability is reduced to 53% in continuous operation, and the remote presentation conference system of present embodiment continuous operation after 80 days reliability just be reduced to 48%.

Under the situation that discontinuous start is used, suppose to start shooting every day 4 hours, to start shooting 16 days in every month, the contrast of the reliability of the reliability of the remote presentation conference system of present embodiment and remote presentation conference of the prior art system is as shown in table 6:

Table 6

X the end of month	??1	??4	??8	??12	??16	??20	??24	??28	??32	??36	??40
												The prior art reliability	??0.94	??0.83	??0.70	??0.60	??0.50	??0.43	??0.36	??0.31	??0.26	??0.22	??0.19
The present embodiment reliability	??0.98	??0.92	??0.85	??0.77	??0.70	??0.63	??0.56	??0.51	??0.45	??0.40	??0.36
												Reliability promotes	??4％	??11％	??20％	??29％	??38％	??47％	??56％	??65％	??74％	??83％	??91％

As can be seen, the reliability of the remote presentation conference system of present embodiment is compared with the reliability of remote presentation conference of the prior art system, the end all promotes in every month, and the time is long more, and the lifting amplitude of the reliability of the remote presentation conference system of present embodiment is also big more.And as shown in table 6, the remote presentation conference system of present embodiment reliability after using 28 months just is reduced to 51%, can satisfy general operational requirement.

Fig. 9 is the comparison diagram of the reliability of the reliability of remote presentation conference system of present embodiment and remote presentation conference of the prior art system, wherein, reliability is the reliability of remote presentation conference of the prior art system before optimizing, optimize the reliability that the back reliability is the remote presentation conference system of present embodiment, as can be seen, after 12 months, reliability after the optimization exceeds 0.2 substantially before optimizing, then show very obviously in this advantage of the later stage of life cycle, relatively raising has reached 1 times (as 40 months time improved 91%) basically.

Embodiment five

After the optimization in the foregoing description, the reliability of remote presentation conference system has had large increase, but and traditional setting up is equipped with TV conference system than still having gap, table 7 to show the reliability of each subsystem in the remote presentation conference system shown in Figure 8:

Table 7

X days	??10	??20	??40	??60	??80	??100	??160	??200
									The conference terminal subsystem	??0.996732	??0.98763	??0.955652	??0.91041	??0.85675	??0.79833	??0.618295	??0.50789
Display subsystem	??0.976286	??0.953134	??0.908464	??0.865888	??0.825307	??0.786628	??0.681131	??0.618783
									Camera subsystem	??0.976286	??0.953134	??0.908464	??0.865888	??0.825307	??0.786628	??0.681131	??0.618783
Speaker subsystem	??0.988072	??0.976286	??0.953134	??0.930531	??0.908464	??0.88692	??0.825307	??0.786628
									The microphone subsystem	??0.988072	??0.976286	??0.953134	??0.930531	??0.908464	??0.88692	??0.825307	??0.786628
Middle control subsystem	??0.999858	??0.999438	??0.997804	??0.995174	??0.991621	??0.987213	??0.969482	??0.954472
									The conference terminal software subsystem	??0.999994	??0.999994	??0.999994	??0.999994	??0.999994	??0.999994	??0.999994	??0.999994
Line subsystem	??0.999975	??0.999975	??0.999975	??0.999975	??0.999975	??0.999975	??0.999975	??0.999975
									System's (total)	??0.927329	??0.85467	??0.714915	??0.588176	??0.477565	??0.383608	??0.189415	??0.114851

Contrast table 7 and table 2 are as can be seen, optimization through the front, though conference terminal subsystem reliability has had very big lifting, but still be the lower subsystem of reliability in the system, in addition, be exactly that demonstration and camera subsystem reliability are low, loud speaker and microphone subsystem all have the space of further raising.

In order further to improve the reliability of conference terminal subsystem, when specific implementation, can dispose a plurality of standby conference terminals, for example, the meeting terminal subsystem is further increased redundancy, form k/n (k=3, n=5) voting subsystem, then the terminal subsystem reliability becomes:

$R_1\left(t\right)=\underset{i=k}{\overset{n}{\mathrm{\Σ}}}{C}_n^i{R}^i\left(t\right){[1-R\left(t\right)]}^{n-i}=10R^3\left(t\right)-15R^4\left(t\right)+6R^5\left(t\right)$

$=10\×e^{-3\×{10}^{-4}t}-15\×e^{-4\×{10}^{-4}t}+6\×e^{-5\×{10}^{-4}t}---\left(14\right)$

Calculate relevant terminal subsystem MTBF easily and be about 7833 hours, can satisfy instructions for use better.

Embodiment six

In the present embodiment, make certain improvements at camera subsystem.

In audio-visual end-equipment, comprise at least one video acquisition end-equipment, use the video acquisition end-equipment, also increase the terminal processing unit of video acquisition and at least one alternate video and gather end-equipment as main; The terminal processing unit of video acquisition can be main when breaking down with the video acquisition end-equipment at certain, and control alternate video collection end-equipment and the video acquisition end-equipment that do not break down are to the service position; Control unit can activate alternate video and gather end-equipment, and indicates audio-visual crosspoint 302 that the vision signal that each video acquisition end-equipment collects is switched to corresponding conference terminal according to the position of current each video acquisition end-equipment.

For example, 3 video cameras of horizontal positioned in the original system, for improving reliability, can adopt 4 video cameras, in level 360 degree scopes, evenly arrange, and be connected with rotating mechanism respectively, behind fault of camera wherein, by the rotating mechanism rotation, make trouble-free 3 video cameras rotate to the service position operate as normal.Specifically can be as shown in figure 10,1001～1004 is 4 video cameras, be connected to motor 1005 (containing transmission device) by rotating mechanism, video camera 1001 under the normal condition, 1002,1003 work, it is video camera 1001 under the normal condition, 1002,1003 positions are the service position, when video camera wherein, for example after 1003 faults, thereby the terminal unit controls rotating mechanism rotation control camera subsystem of handling of video acquisition rotates (motor 1005 rotations drive the rotating mechanism rotation), make fault video camera 1003 rotate to the position of former video camera 1004 (abort situation), then former video camera 1001,1002,1003 positions (service position) become fault-free video camera 1001,1002,1004.Control unit is controlled audio-visual crosspoint 302 camera video signal corresponding with the position is switched to corresponding conference terminal simultaneously.

Suppose that switching mechanism is reliable, then above-mentioned camera sub-system constitutes 3/4 voting subsystem, and its reliability is:

$R_3\left(t\right)=\underset{i=k}{\overset{n}{\mathrm{\Σ}}}{C}_n^i{R}^i\left(t\right){[1-R\left(t\right)]}^{n-i}=4R^3\left(t\right)[1-R\left(t\right)]+R^4\left(t\right)=4R^3\left(t\right)-3R^4\left(t\right)$

$=4\×{\left(e^{-\frac{1}{3}\×{10}^{-4}t}\right)}^3-3\×{\left(e^{-\frac{1}{3}\×{10}^{-4}t}\right)}^4=4\×e^{-{10}^{-4}t}-3\×e^{-\frac{4}{3}\×{10}^{-4}t}---\left(15\right)$

Original camera subsystem MTBF is M ₃=3 * 10 ⁴/ 3=10 ⁴(hour), the MTBF that calculates the camera subsystem that makes new advances easily is

Because the MTBF of camera subsystem has improved, so the reliability of remote presentation conference system also improves thereupon, no longer provides the result of calculation of system reliability here.

Embodiment seven

In the present embodiment, make certain improvements, also can form the k/n k-out-of-n system for display at display subsystem.Comprise at least one video output end-equipment in the audio-visual end-equipment in the present embodiment, export end-equipment with video, comprise that also video is exported terminal processing unit and at least one alternate video is exported end-equipment as main; Video is exported terminal processing unit can be when having the master to break down with video output end-equipment, the position of control alternate video output end-equipment, the video output end-equipment that its replacement is broken down; Control unit can activate alternate video output end-equipment, and the vision signal of the video output end-equipment of indicating audio-visual crosspoint 302 to export to break down is exported to alternate video output end-equipment.

To adopt projection pattern is that example describes, as shown in figure 11, and projecting apparatus 1101,1102,1103 horizontal positioned.Figure 12 is for realizing the schematic diagram to the replacement of projecting apparatus 1102.As shown in figure 12, after projecting apparatus 1102 faults, projecting apparatus 1104 and minute surface 1105 rotate to the top (around axle 1106 rotations) of projecting apparatus 1102, form position as shown in figure 12, at this moment, 1105 pairs of projecting apparatus of minute surface 1102 form and block, and the light that projecting apparatus 1104 sends projects on the projection screen of projection 1102 correspondences after reflecting through minute surface 1105, and the position also is equivalent to the position of projecting apparatus 1102 just.Similar, when projecting apparatus 1101 or 1103 faults, only need rotate to corresponding position, just can substitute 1101 or 1103, the rotating mechanism of rotating mechanism and video camera is similar.See backup projecting apparatus 1104 for fear of the user, preferably projecting apparatus 1104 is designed to the rear-projection mode.

The reliability of display subsystem improves and camera subsystem similar (all being 3/4 voting subsystem), the corresponding raising of system dependability.

Camera subsystem also can design according to the mechanism of projection subsystem, only projecting apparatus need be replaced with video camera and get final product.Certainly display subsystem also can be with reference to the camera subsystem mechanism design of front, and just because display subsystem system relative volume is bigger, integral body moves inconvenience.

Embodiment eight

In the present embodiment, make certain improvements at microphone subsystem and speaker subsystem.

For further improving reliability, a plurality of microphones can be replaced with array microphone, and to array microphone arrangement redundancy, the MTBF that supposes single array microphone like this is 40,000 hours, and then the microphone subsystem reliability of 2 groups of parallel connected array microphone formations becomes:

$R_6\left(t\right)=1-{[1-R\left(t\right)]}^2=1-{(1-e^{-\frac{1}{4}\×{10}^{-4}t})}^2=2e^{-\frac{1}{4}\×{10}^{-4}t}-e^{-\frac{1}{2}\×{10}^{-4}t}---\left(16\right)$

Microphone subsystem MTBF is M in the prior art ₆=6 * 10 ⁴/ 3=2 * 10 ⁴(hour), and the MTBF of the microphone subsystem in the present embodiment is M ' ₆=(2 * 4-2) * 10 ⁴=6 * 10 ⁴(hour).Because the reliability of microphone subsystem has improved, therefore, the reliability of whole system also improves thereupon, provides the result of calculation of system reliability here no longer separately.

Equally, a plurality of loud speakers are replaced with array speaker apparatus, and array speaker is carried out redundancy, can improve the reliability of speaker subsystem, and then improve system dependability.

More than all can adopt active and standby mode to the redundancy of microphone and loud speaker with load sharing, active and standby with the load sharing mode under, in fact strengthened pickup or replaying effect.

Optimization by the foregoing description one to eight, the contrast of the reliability of the remote presentation conference system in the embodiment of the invention and the reliability of traditional unit/terminal conference system as shown in figure 13, as can be seen from Figure 13, if dropping to 50% with reliability is lower limit, telepresence system of the prior art can only continuous firing about 40 days, can continue to work until 80 days through the telepresence system after embodiment one to four optimization, can continue to work until more than 200 day through the system after embodiment one to eight optimization, and traditional TV conference system also can only be worked about 160 days, and the reliability of the remote presentation conference system in the embodiment of the invention has surpassed the reliability of traditional unit/terminal conference system.System after embodiment one to eight optimizes also has an advantage, at its reliability height in early stage, it is slower to decay, and the later stage reliability is low, and we are desirable just for this, with traditional TV conference system ratio, after general continuous firing is about 360 days, (according to start in every month 16 days, starts shooting every day and calculated in 4 hours, worked) above 11 years, just be lower than traditional TV conference system through its reliability of system after embodiment one to eight optimization, at this moment equipment is substantially discarded.

When specific implementation, audio-visual crosspoint 302, network exchange unit 305 can be built in the conference terminal, and audio-visual crosspoint 302, network exchange unit 305 also can be merged into an equipment.Line subsystem and conference terminal subsystem, middle control subsystem switch in specific implementation the time also can be undertaken by Artificial Control.And, the technical scheme among the embodiment one to embodiment eight can be separately or combination in any realize.

Embodiment nine

The control device of the remote presentation conference in the present embodiment is applied to comprise that this control device can be corresponding with embodiment one in the remote presentation conference system of a plurality of conference terminals as shown in figure 14, comprises audio-visual crosspoint 302 and control unit 304, wherein,

Described audio-visual crosspoint 302, the audio frequency and/or the vision signal that are used for described this locality is collected are exported to described conference terminal, and the signal that receives the output of described conference terminal sends to audio-visual end-equipment, and carries out the switching of audio frequency and/or vision signal according to the indication of described control unit 304;

Described control unit 304 is used to indicate described audio-visual crosspoint 302 signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down.

Further, this device can be corresponding with embodiment two, comprise standby conference terminal in these a plurality of conference terminals, described control unit 304 is when defining the conference terminal fault, activate described standby conference terminal, and indicate described audio-visual crosspoint 302 that the audio frequency and/or the vision signal of the conference terminal that breaks down are switched to described standby conference terminal.

Above-mentioned control unit 304 can also be used for when defining the conference terminal fault, utilizes the configuration information of the conference terminal that breaks down that described standby conference terminal is configured.

Further, this device can be corresponding with embodiment four, at least comprise two control units in this device, wherein at least one control unit is the main control unit of using, at least one control unit is standby control unit, when described master detects faults itself with control unit, activate described standby control unit;

Perhaps, when described standby control unit does not receive the heartbeat signal of described main usefulness control unit in setting-up time, activate described standby control unit.

Embodiment ten

The control method of the remote presentation conference in the present embodiment is applied to comprise in the remote presentation conference system of a plurality of conference terminals, as shown in figure 15, may further comprise the steps:

Step S1501 detects whether fault of conference terminal, and when definite conference terminal fault, carries out step S1502, continues detection otherwise return step S1501;

Step S1502 switches to the signal on the conference terminal that breaks down the conference terminal that does not break down.

Further, this method can be corresponding with embodiment two, if comprise standby conference terminal in this a plurality of conference terminals, then when determining described conference terminal fault, also comprises the described standby conference terminal of activation; Describedly signal on the conference terminal that breaks down is switched to the signal that the conference terminal that does not break down is specially on the conference terminal that will break down switch on the described standby conference terminal.

In the method, before the signal on the conference terminal that will break down switches on the described standby conference terminal, also utilize the configuration information of the conference terminal that breaks down that described standby conference terminal is configured.

Detect in the control method of remote presentation conference in the present embodiment conference terminal whether fault method can for:

Receive the heartbeat signal that described conference terminal sends,, then determine described conference terminal fault if in setting duration, do not receive described heartbeat signal;

And/or

When receiving the handoff request of described conference terminal transmission, determine that described conference terminal fault, described handoff request are that described conference terminal sends when detecting faults itself.

In sum, because the remote presentation conference system in the embodiment of the invention has increased audio-visual crosspoint 302, this audio-visual crosspoint 302 can be controlled the interconnection of any video/audio signal, therefore, when control unit is determined certain conference terminal fault, can indicate audio-visual crosspoint 302 that the signal on the conference terminal that breaks down is switched to the conference terminal that does not break down, thereby ensure the operate as normal of whole remote presentation conference system.As can be seen, the remote presentation conference system in the present embodiment compares with remote presentation conference of the prior art system, has better reliability.Further, by each subsystem in the remote presentation conference system all is optimized, makes the reliability of each subsystem all be improved, thereby make whole remote presentation conference system have better reliability, can increase customer satisfaction degree, reduce maintenance cost.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (21)

1, a kind of remote presentation conference system is characterized in that, comprises audio-visual end-equipment, audio-visual crosspoint, a plurality of conference terminal, at least one control unit, wherein:

Described audio-visual end-equipment, be used to carry out local at least one group of audio frequency and/or collection of video signal, and audio frequency and/or vision signal that this locality collects exported to described audio-visual crosspoint, and play audio frequency and/or the vision signal that receives from described audio-visual crosspoint;

Described conference terminal, the external audio and/or the video data that are used for obtaining from external network are exported to described audio-visual crosspoint, and will export to described external network from audio frequency and/or vision signal that described audio-visual crosspoint obtains;

Described audio-visual crosspoint, the audio frequency and/or the vision signal that are used for described this locality is collected are exported to described conference terminal, and the signal that receives the output of described conference terminal sends to described audio-visual end-equipment, and carries out the switching of audio frequency and/or vision signal according to the indication of described control unit;

Described control unit is used to indicate described audio-visual crosspoint the signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down.

2, system according to claim 1, it is characterized in that, comprise at least one standby conference terminal in described a plurality of conference terminal, described control unit is further used for when the conference terminal fault is arranged, activate described standby conference terminal, and indicate described audio-visual crosspoint that the audio frequency and/or the vision signal of the conference terminal that breaks down are switched to described standby conference terminal.

3, system according to claim 2 is characterized in that, described control unit also is used for when the conference terminal fault is arranged, and utilizes the configuration information of the conference terminal that breaks down that described standby conference terminal is configured.

4, system according to claim 1 is characterized in that, described control unit and described conference terminal merge setting.

5, system according to claim 1, it is characterized in that, at least comprise two control units in the described system, wherein at least one control unit is the main control unit of using, at least one control unit is standby control unit, when described master uses the control unit fault, activate described standby control unit.

6, system according to claim 1 is characterized in that, also comprises network exchange unit, is connected to described external network by at least two circuits, is used to carry out the transfer of data between described external network and the described conference terminal.

7, system according to claim 6 is characterized in that, described at least two circuits comprise that at least one is main with circuit and at least one extension wire;

Described network exchange unit is used for activating described extension wire when described master uses line fault.

8, system according to claim 6 is characterized in that, described at least two circuits are worked simultaneously;

When described network exchange unit is used for therein a line fault, the signal that transmits on the circuit that breaks down is switched on the circuit that does not break down.

9, system according to claim 1 is characterized in that, described audio-visual end-equipment comprises one of following end-equipment or combination in any:

The video acquisition end-equipment is used to gather vision signal;

The audio collection end-equipment is used to gather audio signal;

Video output end-equipment is used to play the vision signal that receives;

Audio frequency output end-equipment is used to play the audio signal that receives.

10, system according to claim 9, it is characterized in that, comprise at least one video acquisition end-equipment in the described audio-visual end-equipment, as the main video acquisition end-equipment of using, also comprise the terminal processing unit of video acquisition and at least one alternate video collection end-equipment, wherein:

The terminal processing unit of described video acquisition, be used for have main when breaking down with the video acquisition end-equipment, control described alternate video collection end-equipment and the video acquisition end-equipment that do not break down to the service position;

Described control unit also is used to activate described alternate video and gathers end-equipment, and indicates described audio-visual crosspoint that the vision signal that each video acquisition end-equipment collects is switched to corresponding conference terminal according to the position of current each video acquisition end-equipment.

11, system according to claim 10 is characterized in that, described primary and backup video acquisition end-equipment level evenly distributes, and is connected with rotating mechanism respectively;

The terminal processing unit of described video acquisition specifically is used for when described video acquisition end-equipment breaks down, control described rotating mechanism rotation, make described alternate video collection end-equipment and the video acquisition end-equipment that does not break down rotate to the service position.

12, system according to claim 9, it is characterized in that, comprise at least one video output end-equipment in the described audio-visual end-equipment, export end-equipment with video as main, comprise that also video is exported terminal processing unit and at least one alternate video is exported end-equipment, wherein:

Described video is exported terminal processing unit, is used for controlling the video output end-equipment that the replacement of described alternate video output end-equipment is broken down when having the master to break down with video output end-equipment;

Described control unit also is used to activate described alternate video output end-equipment, and the vision signal of the video output end-equipment of indicating described audio-visual crosspoint to export to break down is exported to described alternate video output end-equipment.

13, a kind of control device of remote presentation conference is applied to comprise in the remote presentation conference system of a plurality of conference terminals, it is characterized in that, comprises audio-visual crosspoint and control unit, wherein,

Described audio-visual crosspoint, the audio frequency and/or the vision signal that are used for described this locality is collected are exported to described conference terminal, and the signal that receives the output of described conference terminal sends to audio-visual end-equipment, and carries out the switching of audio frequency and/or vision signal according to the indication of described control unit;

Described control unit is used to indicate described audio-visual crosspoint the signal on the conference terminal that breaks down to be switched to the conference terminal that does not break down.

14, device according to claim 13, it is characterized in that, comprise standby conference terminal in described a plurality of conference terminal, described control unit is further used for when defining the conference terminal fault, activate described standby conference terminal, and indicate described audio-visual crosspoint that the audio frequency and/or the vision signal of the conference terminal that breaks down are switched to described standby conference terminal.

15, device according to claim 14 is characterized in that, described control unit also is used for when defining the conference terminal fault, utilizes the configuration information of the conference terminal that breaks down that described standby conference terminal is configured.

16, device according to claim 13 is characterized in that, comprises two control units in the described device at least, and wherein at least one control unit is that main to use control unit, at least one control unit be standby control unit,

When described master detects faults itself with control unit, activate described standby control unit;

Perhaps, when described standby control unit does not receive the heartbeat signal of described main usefulness control unit in setting-up time, activate described standby control unit.

17, a kind of control method of remote presentation conference, be applied to comprise in the remote presentation conference system of a plurality of conference terminals, it is characterized in that, may further comprise the steps: detect whether fault of described conference terminal, and when determining described conference terminal fault, the signal on the conference terminal that breaks down is switched to the conference terminal that does not break down.

18, method according to claim 17 is characterized in that, comprises standby conference terminal in described a plurality of conference terminals, then when determining described conference terminal fault, also comprises and activates described standby conference terminal; Describedly signal on the conference terminal that breaks down is switched to the signal that the conference terminal that does not break down is specially on the conference terminal that will break down switch on the described standby conference terminal.

19, method according to claim 18, it is characterized in that, before the signal on the conference terminal that will break down switches on the described standby conference terminal, also utilize the configuration information of the conference terminal that breaks down that described standby conference terminal is configured.

20, according to claim 17,18 or 19 described methods, it is characterized in that, the described conference terminal of the described detection whether method of fault is: receive the heartbeat signal that described conference terminal sends, if do not receive described heartbeat signal in setting duration, then determine described conference terminal fault.

21, according to claim 17,18 or 19 described methods, it is characterized in that, the described conference terminal of the described detection whether method of fault is: determine that described conference terminal fault, described handoff request are that described conference terminal sends when receiving the handoff request that described conference terminal sends when detecting faults itself.

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