Urgent for course design: a company's video conference system!

System design requirements

According to the requirements of hotel conference room rental intelligent system, this design scheme consists of digital conference system and large screen projection system. At the same time, the scheme also provides the reservation of multilingual simultaneous translation system. When the system is expanded, it is only necessary to install the corresponding infrared transmitter, infrared reflector, interpreter and infrared receiver, and the portable earphone can complete the simultaneous interpretation function.

system requirements

1, video conference feedback function. It can realize two-way transmission function and ensure the live broadcast of the conference.

2. Conference lighting and volume have centralized control function.

3. The sound system should give consideration to both meetings and performances.

4.MD digital recording function

5. Digital video image output function.

6. There are wired and wireless audio transmission functions.

Digital conference system

The conference center and hotel leadership meeting room rented by the hotel are equipped with digital conference network system for large meetings and small meetings. The system is an advanced system of the same kind, which adopts all-digital technology without distortion, attenuation and noise, and its sound quality is clear and stable. Its modular design makes the system structure very convenient and flexible.

1) Basic equipment:

Comprises a central controller, a chairman computer, a representative computer and a voter. Each device has a variety of models to choose from to meet different functional and appearance requirements.

The system is equipped with a standard central controller, which can realize basic microphone management functions, including application, ultra vires, sound pressure control and other management modes, and can allow 1, 2 and 4 microphones to be enabled at the same time, as well as the application of four voting functions: present, yes, no and abstention. A more advanced central controller can use computers to realize more functions, such as multi-choice voting, intentional voting, global microphone management, TV screen display and so on.

The central controller has standard audio input and output interfaces, which can be conveniently connected with the sound system or output for sound reinforcement, recording or inputting background music.

Representative machine is the most basic voice equipment. In addition to the basic speech function, the chairman's machine also has the function of giving priority to the chairman, and can interrupt the representative's speech at any time.

In order to control the meeting progress and maintain the meeting order. The voter has the application of four voting functions of "present", "yes", "no" and "abstention", or the voting function is expanded according to the computer of the central controller.

All representative machines and chairman machines can have voting function.

2) Configuration of terminal equipment in each meeting room:

According to the functional requirements, two sets of DCN digital conference systems are configured to meet the needs of two main conference rooms. Considering the use of the site, pedestal equipment is adopted. All the sound generating devices are connected in series to the central controller.

3) Implementation scheme

According to the functional orientation of the hotel, the conference center is mainly suitable for large-scale conferences and multi-functional purposes. Adopt 1 set of digital conference system and 30 sets of infrared listening system, with simultaneous interpretation function, suitable for conferences in three languages. The conference room of the hotel leadership committee is equipped with 1 set of digital conference system with voting function, which is suitable for leadership decision-making meetings.

(1) conference center

Conference center, 1 central controller, 1 chairman's computer (with voting function), 8 representative computers (with voting function) and 30 audience seats. To realize the chairman's speech and the representative's speech, the chairman can control the representative. It has a three-channel simultaneous interpretation system, which is suitable for trilingual conferences.

The system design is as follows:

The main control of DCN digital conference network system consists of 1 DCN enhanced central controller (LBB3500/00), which can provide control for 240 voice devices and power supply for 90 voice devices. The main purpose of using LBB3500/00 is to expand users' demand for various voting methods in the future. Under the current configuration, the voting results can be sent to the LCD screen of the chairman's machine.

The system uses 1 billiard hall camera to monitor the meeting place and record the speaker, so as to monitor the whole meeting place and record the speaker to save the meeting records.

Considering the use of the conference room and the demand for future expansion, the simultaneous interpretation function is reserved, all cables are laid in place, and the equipment is not configured for the time being, so it can be shared with other conference room equipment or expanded in the future.

(2) Hotel leadership meeting room

The hotel leadership meeting room is a round-table meeting room in terms of area and function, with about 16 seats, 1 chairman (with voting function) and 15 delegates (with voting function). It is necessary to realize the chairman's speech, the representative's speech, the chairman's control over the representative, and the voting of all the representatives and the audience. Voting functions include consent, veto and abstention.

The system design is as follows:

The main control of DCN digital conference network system is realized by 1 DCN standard central controller (LBB3500/00), which provides control of 240 voice devices and power supply of 90 voice devices.

The discussion machine adopts 1 chairman machine with voting function (LBB3554/00) and 15 representative machine with voting function (lbb355100/00). The system can output the voting results to the LCD screen of the host computer. The monitoring of the whole meeting place and the video recording of the speaker are completed by a spherical camera installed above the meeting room. Considering the use of the conference room and the demand for future expansion, the simultaneous interpretation function is reserved, all cables are laid in place, and the equipment is not configured for the time being, so it can be shared with other conference room equipment or expanded in the future.

2. 10.5 large screen projection system

1) overall design

According to the demand, a set of large-screen system is configured in the conference center of the hotel office building and the hotel leadership meeting room respectively.

The system includes the following subsystems and functions:

Display system: There are 65,438+0 projectors, which are used to display the video signals of computers, video playback equipment, conference TV and physical display platforms.

Audio-visual system: It consists of microphone, audio signal amplification and video signal. The microphone amplification part is used to amplify microphone signals during meetings or teaching and training. The audio amplification part is used to amplify audio signals such as video tapes and DVDs. Microphone and audio signal amplification should have good sound field effect. Video signal switching should be convenient.

Control system: The main equipment and facilities of the control system make the operation of the system convenient, flexible and reliable.

2) Design of display system

The display system mainly undertakes the display of various video signals, and the system is served by 1 projector. The system consists of 1 projector, 1 screen, multimedia computer and computer signal switcher.

Selection of projector:

-Require the projection effect to be clear at the brightness where you can take notes. Therefore, the brightness index cannot be lower than 4000ANSI lumens.

-Because the resolution of computers used now is mostly 1024*768, the resolution of workstations is

1280* 1024, so the resolution of the projector should be 1024*768, which can support1280 *1024; meanwhile

With computer DVD and video input interface, supporting multiple formats.

-Considering the convenience of installation, maintenance and control, avoiding the trapezoidal appearance and thermal protection when the projector is put into operation for a long time, and being suitable for front projection and rear projection, we choose a projector with double trapezoidal correction and low power consumption and heat dissipation, and adopt a cold light NSH energy-saving lamp.

-According to the wall size and the whole room space size, the conference center on the first floor is equipped with a 150 "projection screen, which is often used on the fifth floor.

The Committee meeting room is equipped with 120 "projection screen.

3) Audio-visual system design (example)

Audio-visual system is divided into microphone, audio amplification and video signal.

The sound system adopts 1 set of sound art 8-way mixer with power amplifier, and 1 set of British CELSTION KR8 sound. Its input signals include: cable TV, CD, magnetic tape, VCD, video recording, switcher, FM tuner, etc.

Microphone sound reinforcement system requires uniform sound field distribution. Try to avoid self-motivation and shouting. Audio signals of tape recorders, video recorders, DVD players and other equipment should be connected to the system, and the audio signals should have a good speaker effect. Video signals include video recorders, DVD players, etc. The video signal image should be clear. Switching is timely and convenient.

4) Design of control system

In order to make the operation of the system reach the modern high-tech level, the control system adopts the American advanced Crestron centralized control system, which is convenient, flexible and reliable to operate.

Points that can be controlled by the centralized control system include:

-Electric curtains, lamps, electric screens.

-Individual control and configuration control of the projector.

-computers, video recorders, DVDs, DVD players, card stands, etc.

The control system mainly provides real-time switching for environmental facilities such as sound and image equipment, lighting and curtains. Device control (recording and playback, fast forward, fast backward, etc.). ) This paper focuses on infrared remote control and screen lifting control to save time and improve meeting quality and efficiency.

2. 10.6 video conference system

1) system overview

Video conference system can realize point-to-point or point-to-multipoint modern image communication office and conference system through TV video images. The system can be installed in all levels of leadership offices and departments in the building, as well as important conference rooms. In this way, leaders can hold video teleconferences or video conferences without leaving the office. Save time and improve office efficiency. The system includes: desktop video conference terminal, professional video conference system terminal, multipoint video conference controller and video conference auxiliary software and hardware equipment.

It is the key to embody a smart hotel to establish visual information interaction between the office, conference room and remote conference point of the hotel. The whole video conference network must be a star network structure model based on multipoint server (MCS), and each branch can support not only point-to-point communication, but also multipoint communication. More importantly, due to the need to transmit all kinds of data and image information between venues, information exchange and cooperation are very close. Therefore, the whole network not only needs two-way real-time video and audio, but also has strong data cooperation and information sharing capabilities, including whiteboard graphics, clipboard sharing, file transfer and personal computer applications. In order to enjoy this information and facilitate communication, each conference room system must use flexible and easy-to-use peripheral equipment and adapt to the use of the whole conference participants. In addition, the whole network must conform to the international standard T. 120, so as to be suitable for point-to-point and point-to-multipoint data processing and image exchange. And can be connected to other video conferencing systems on the WAN to meet the requirements of external communication. Specifically, the following functions should be realized:

-Local conference: Video conference can be held between offices through DDN network and local area network.

-teleconference: each office or meeting room holds a video conference with the remote end through the public DDN network.

-Multicast: It can support multiple video conferences, mix audio signals of various venues, and select videos.

And transmits the desired mixed data to an appropriate conference terminal. If you can use these conference terminals.

Audio excitation, director control or chairman control and other different methods to select video sources.

-Simultaneous interpretation function

2) System design scheme

This scheme is a combination of video conference system based on LAN and video conference system based on DDN. The video conference system based on LAN is suitable for the near meeting place, and the video conference system based on DDN is suitable for the far meeting place, such as meeting places in different buildings, cities and even countries.

In view of the compatibility problem of terminal equipment produced by various manufacturers, it is better to choose the products of a single manufacturer at present. After comparison, this system adopts the products of Picture Tel, a professional manufacturer with the highest market share in the world (statistics 1995).

Referring to the video conference system scheme of the Ministry of Public Security, Picture Tel Concorde 4500 conference system is selected for the central conference room, and SwitSite 760 portable conference system is installed in the hotel leadership conference room. Connecting to the public security private network through DDN, H.320 Prism MCU can be selected as needed to realize remote multipoint video conference. In the local area network, the office chooses Live LAN desktop conference terminal, and realizes multipoint video conference in the local area network by using Concorde 4500 conference system through LiveManager bandwidth control and conference management software, NC 330 network conference multipoint service software and PT2 10 gateway. Multi-channel video broadcasting is realized by StarCast broadcasting software. Specific instructions are as follows:

-Concorde 4500 conference room terminal and SwitSite 760 portable conference system can be connected with DDN network switch through DDN dedicated line, and can communicate with LiveLAN point-to-point, with the highest transmission rate of 384K, and can also conduct point-to-point video conference with remote meeting place through public DDN network.

-According to the specific needs of the hotel office building, several sets of desktop video conferencing systems (LiveLAN) can be installed on the terminal of the conference room or the leading office. Point-to-point video conference or multipoint video conference between meeting rooms/offices can be conducted through local area network. The transmission rate can reach 768K, and the image transmission rate can reach 30FPS. In this scheme, only two standard desktop video conferencing systems are configured temporarily.

-Install a LiveManager for network flow control and call management on the LAN of conference TV system. Because the H323 standard adopted by local area network is different from the H320 standard adopted by DDN network, LiveGateway is installed on local area network to realize the conversion of two different standards, so as to realize point-to-point network video conference between main conference room and sub-conference room/office.

-As there is only one professional conference terminal, an H.323 multipoint conference server NetConference, which can support 24-point simultaneous conference at present, can be economically established on the local area network of the whole building at the same time, and the server can support multipoint conference through DDN or Internet.

-Install a set of StarCast software to realize multi-channel video playback.

3) System function

-Video transmission adopts duplex mode, and the transmission rate is above 384K;

-Multicast communication is possible;

-Interactive control capability;

-Voice control function with multiple modes;

-Chairman mode: under the control of the chairman, one party speaks and other venues listen;

-Call-back mode: the chairman designates two meeting places to talk, and the other meeting places can only call back without interruption;

-discussion mode: the chairman turns on all the voices in the meeting place so that everyone in the meeting place can speak;

-Dual mode image conversion function;

-Image playing mode: playing images of any venue to other venues;

-Chairman's image selection mode: the chairman chooses to view the images of any venue.

PC workstation with real-time LAN hardware and corresponding software and network server with real-time gateway software constitute a video conference system based on LAN. Workstations in a local area network can hold multiple point-to-point video conferences. Through Live Gateway and NC330, workstations in local area network can hold video conference with external video conference system terminal equipment.

The whole video conference system mainly consists of seven parts:

-Concorde 4500 conference room TV system

-SwiftSite 760 Portable Video Conference System

-Livelan desktop video conferencing terminal

-Site Manager, Conference TV Manager

-live gateway, conference TV gateway

-pt 330 network conference multipoint service software

-Starcast video multicast

Work efficiency and service level can be improved without investing too much resources. Users can also easily communicate and edit various documents, such as spreadsheets, slides and contract texts, through Picture Tel's Live Share Plus technology. Live Share Plus technology is an international award-winning data sharing and collaboration technology based on T. 120 standard, and it is also the core technology of Microsoft NetMeeting products. Through TCP/IP protocol, LiveLAN can make the data of conference TV run in the existing LAN/Intranet structure, and can control the allocation of network bandwidth under the management of LiveManager.

Features:

-Provide a complete and easy-to-use video conference solution based on H.323 standard. Comprises a video conference interface card, a camera, a speaker and a microphone, and integrates T. 120 multipoint collaborative computing software. -Multi-point data * * * enables users to exchange information and opinions in real time without leaving their desks, thus making better and faster decisions. This function includes application sharing, file transfer, whiteboard and remote control. -Enables users running Windows 95PC to collaborate on projects through video conferencing, thus speeding up the decision-making process. -Transmission independence-It can be transmitted on any network supporting TCP/IP protocol, such as Ethernet, Fast Ethernet, Optical Fiber Network (FDDI), Token Ring, Frame Relay and Asynchronous Transfer Network (ATM).

-Allow users to control the bandwidth allocation of conference TV through conference management, so that users can use conference TV more effectively.

-Products specially designed for LAN/Intranet. Nowadays, it is possible to conduct video conference on enterprise LAN/Intranet. It is realized by using video phone products based on H.323 standard.

4) System product introduction

-Concorde 4500 conference room TV system

Concord series adopts Picture Tel patented technology, providing high frame rate, super action processing and reducing low-frequency broadband audio delay; Its advanced audio performance can produce the clearest and most natural sound in the industry, thus providing the most comprehensive, high-quality and flexible video conference scheme to meet the most complex and demanding meetings. Concorde system not only includes the wireless keyboard that can control the system at will and Picture Tel's unique "LAMB" technology, so that any sender can focus on the sender after pressing this button, so that the other party can clearly observe the speaker.

* support SG4 patented algorithm and H.320 international standard.

Picture Tel fully supports the H.320 international video conference standard protocol, thus ensuring full compatibility with other manufacturers' video conference terminal equipment. Picture Tel provides SG4 patented algorithm for demanding comprehensive conference, which has the best direct dial video conference effect, and uses motion coding to improve the video conference quality. SG4 data is multiplexed according to the H.22 1 protocol, which allows most features based on H.320 to be supported, and the best video conference quality can be achieved in 128-256Kbps broadband. The realization of 30 frames per second at 256Kbps can directly dial the broadband of 256Kbps or higher, and can provide 30 frames per second on the screen, which is a real and natural movement effect. Thanks to Picture Tel Concorde's superb sound technology and specially optimized Bose active speakers, the best sound effect is excellent.

* "Look here" button

In order to keep the video conference natural and smooth and promote the positive multilateral effect, this product provides the following standard functions: multiple input ports, wireless keyboard and gundam 10 "Look here!" Look at my button.

* A variety of network interfaces dual V.35/RS366 dial dual RS449/RS366 dial V.35/RS449 dedicated line mode.

* Various transmission rate standards: 64Kbps-768Kbps.

* Support up to five image input devices.

* main camera; The main camera has remote control function, and users can control the main camera conveniently through the infrared keyboard.

* Two auxiliary cameras; Two auxiliary cameras can help users capture venue information in a fixed or dynamic way. These two auxiliary cameras can be connected to various cameras, such as hand-held cameras, pocket-sized cameras or fixed high-end cameras.

Teletext camera; Teletext cameras can capture text information, so participants can watch the speaker's speech from the video conference system.

* a video recorder that can play images; The large-screen TV can output dual-output video conference images, and can be connected to a video recorder to record the whole process of the conference.

* PT80 with excellent performance

The main camera recommended by Tel is PT80, which can rotate left and right 100 degrees, tilt up and down -30 degrees to+15 degrees, auto focus, auto exposure, auto white balance, zoom range 12 times, and the maximum horizontal field of view is 66 degrees. It can be completely controlled by infrared keyboard. Users can control the main camera in all directions.

* equipped with the widest pickup PowerMIC.

* Operating environment: NetConference330 aims to meet the collaborative work and network operating environment of a wide range of users. Typical application modes include virtual workgroup application and enterprise application.

5) LiveLAN desktop conference terminal

LiveLAN is a video conference solution based on TCP/IP protocol. LiveLAN can bring full dynamic and high resolution video conference effect on LAN/Intranet. By installing cameras, video and audio decoders, microphones and microphones, users get the best choice for communication on LAN/Intranet. LiveLAN ensures that users get the best performance on the network through embedded intelligent mechanism. Advanced decoding technology enables LiveLAN to adapt to the periodic congestion on the network and make the conference TV run in a balanced way. Because LiveLAN uses hardware technology, the overhead of CPU is very low, so when running other applications on the network, users will not obviously feel the decline of frame rate and image quality like some video conferencing products using software technology. At the same time, during the video conference, you can also enjoy applications and data through T. 120 collaboration software.

Through the call routing function of LiveManager, users of LiveLAN can call users of H.323 or H.320 without knowing where the users are and what network they are connected to. Usually, the user only needs to select the corresponding user name in the phone book, and the call can be automatically connected, and the details of the connection are completely transparent to the user.

6) LiveManager Video Conference Manager

LiveManager is a set of management software based on H.323 standard, which can determine the use of video and audio according to the network configuration and capacity. By combining the intelligent design of LiveManager and LiveLAN, users can easily conduct conference TV on LAN.

LiveManager can control the network bandwidth allocation of conference TV through a mechanism. So as to ensure the smooth and continuous operation of the network. You can also automatically establish the call of LiveLAN through a simple name or phone number, and users can also monitor the call between LiveLAN and LiveGateway through their own networks.

LiveManager consists of two softwares: one is called "Live Manager" console, which is installed on a PC above Windows95NT, and the other is installed on an NT4.0 server, which does not need a special server and only takes up part of the space on the existing server. Network administrators can monitor the usage of LiveLAN on the network from the console.

By optimizing the LiveLAN performance of the network, LiveManager can improve the working efficiency of the working group, department and even the whole organization, and each enterprise network only needs one LiveManager.

7) PT2 10 LiveGateway Video Conference Gateway

PT2 10 LiveGateway is a standard gateway of H.323 and a value-added tool installed on Windows NT workstation or server. It can provide communication between LiveLAN and other H.323 clients and H.320 standard systems, as well as communication between other LiveLANs connected through ISDN WAN. LiveGateway includes cards and application software installed on the server. The LiveGateway console is integrated in LiveManager and managed by LiveManager through SNMP. Through the control platform, LAN administrators can test, diagnose and configure ISDN networks connected to LiveGateway.

LiveGateway enables LiveLAN users to accept or call H.320 desktop or group systems, such as Picture Tel's Live200 desktop system, SwiftSite, Venue2000, Concorde4500 group system and other manufacturers' H.320 compatible systems. Through LiveGateway, LiveLAN users can also call H.320 MCU, such as montage and prism of Picture Tel, to participate in H.320 multi-screen multipoint conference.

Through ISA/EISA adapter, LiveGateway can be installed on any Windows NT 4.0 TCP/IP workstation or server. Up to 4 network checkpoints can be installed on each platform. After installing LiveGateway and connecting with DDN, LiveLAN users and other H.323 users can directly dial the DDN video number of any H.320 system using the LiveLAN dial. On the contrary, H.320 users outside the local area network can dial with DTMF or call LiveLAN users through the operation terminal. LiveGateway also provides LiveLAN users in different locations with the ability to call each other through DDN. This is very useful when routing connections between different locations are crowded and slow.

8) picture Tel 330 network conference multipoint service software

Photo Tel 330 multipoint software for network conference brings the advantages of multipoint video conference to more organizations, which is an economical and flexible IP-based conference and * * * sharing scheme.

Through Picture Tel 330, organizations can create virtual meeting rooms on intranets, extranets and the Internet. Users based on H.323 conference clients, such as LiveLAN, can call and participate in multipoint conferences in these virtual conference rooms when they cannot have face-to-face meetings due to time and distance. Picture Tel 330 also provides an easy-to-use Web-based meeting arrangement and meeting management tool, which enables users to book and manage virtual meeting rooms conveniently.

By providing users with the ability to realize multipoint conference TV on their intranet, Picture Tel 330 combines the conference costs and requirements of users into a network, which can provide high connection rate, comprehensive directory service, global transmission connection and standard client/server applications and protocols.

9) Multipoint server prism (optional)

The 320 multipoint conference network consists of H.320 conference terminal, H.320 multipoint conference controller and transmission network, among which the multipoint conference controller is the key of the conference network, which will provide multipoint capability and the integration of various networks.

H.320 multipoint server series is an open system, built on the industrial standard platform using Intel x86 control processor. This method avoids the disadvantage that the traditional multipoint control unit (MCU) can no longer be used in business expansion. All system hardware and software departments are modular and interchangeable, which means fewer spare parts need to be stored and maintained.

Each server includes a basic system rack for inserting module cards and software. The type of rack determines the model of the system. Each rack contains system software, peripherals, motherboard and power supply. All slots (except one slot in the Prim reserved for internal use of the server) can be used for inserting module cards. You can place modules in any order in the available slots.

The backbone of multipoint conference network will adopt ISDN network, and at the same time, it will be connected with private conference network and future ATM network through multipoint conference server, and provide multipoint service for H.323 conference terminal through the gateway between ISDN and LAN.

Prism can support multiple video conferences, and each conference contains multiple users. Prism mixes audio signals from various meeting places, selects video sources, and transmits the required mixed data to appropriate meeting terminals. These conference terminals can use different methods such as voice excitation, director control or chairman control to select video sources.

Prism is combined with PictureTel's group conference TV products or desktop conference TV products, so users can display multiple participants at the same time.

Prism has three image switching modes:

-Chairman's control:

Any meeting point can apply for the chairman control function.

Optional broadcasting company

You can delete a meeting point.

You can browse the assembly point at will.

You can end the meeting.

You can give up the control function of the chairman.

-Voice control:

In the multipoint conference TV system, MCU automatically switches the picture from a venue to a venue with a loud voice, and plays it according to the volume of the participants' speeches.

-Director control:

The status of each participant (including images, sounds and data) is vividly displayed on the monitor of the workstation connected to MCU2. Managers can directly select the participants they want to view through mouse operation and management software.

* Comprehensive diagnosis

MCU can judge the possible problems in the controller and network, such as power-on diagnosis, online diagnosis, various inspection, alarm and event recording.

:: Central control

You can choose the multipoint management system of MCU center to manage multiple MCUs from one place.

* adjustable voice rate

MCU can change the transmission bandwidth allocated to voice (from 16 kbps to 64 kbps), which is especially important for conference TV with transmission channel capacity of 128kbps or lower, so as to obtain satisfactory image quality.

Prism supports various connections to public or private networks. Interfaces are: E 1, ISDN interface has main group rate and basic rate, V.35/RS-449/RS-422. These interface boards are optional when ordering Prism. The basic rate interface board can provide four BRI line connections; The V.35/RS-449/RS-422/X.2 1 module can be used with channel service unit/data service unit (CSU/DSU) or connected with special data communication equipment, such as E 1 multiplexer and inverse multiplexer. The V.35/RS-449/RS-422/X.2 1 interface can also directly connect the video conference codec and the Prism server. Prism can be used with an inverse multiplexer to support data rates up to 768kbps.