Section 1 System Overview
With the rapid development of modern information processing technology, various enterprises and institutions have higher and higher requirements for office modernization. Therefore, the conference room has gradually evolved from a purely listening and hearing-based communication place to a multi-functional communication venue. A place for information resource interaction with comprehensive functions. Modern multimedia conference rooms include paperless conferences, conference sound reinforcement, conference speeches and discussions, multimedia display, signal processing, network communications, conference lighting and other systems. Then through the central integrated control system, the above various devices are organically combined with the entire conference environment into a whole, so that the conference manager can easily manipulate the entire conference process with a single touch. The configuration of the conference system is becoming more and more professional, and the functions are becoming more and more powerful. Therefore, the design of the multimedia conference room has also undergone very big changes. How to physically, logically and functionally connect subsystems with different functions to achieve information integration and resource sharing. The system can fully meet the various functions required by users, and meet the indicators of relevant industry standards, and the entire system has advanced, forward-looking, expandable and high performance-price ratio.

When determining the demand plan, it is not only necessary to clarify what "functions" the conference room actually needs, how many "systems" should be included, and what specifications and standards each system implements, and what indicators it achieves. Moreover, in the plan, from equipment configuration to system layout, full consideration should be given to systems that are not currently configured due to various reasons but must be configured for future upgrades. Necessary pipelines and reserved expansion interfaces should be embedded to facilitate future upgrades. "Break through" or "update all", thus reflecting the standardization, advancement, forward-looking and expandability of the program.



Section 2 Design Ideas
Overall design requirements

The system must have advanced awareness, advanced design ideas, and technically adopt international and domestic advanced technical means to ensure that the system reaches the domestic advanced level. The required technical design solutions and selected products have the following characteristics: practicality, standardization, openness, advancement, high scalability, safety, economy, system integration and manageability.

In addition to system design and equipment selection to meet existing requirements, equipment configuration should meet the needs of future system expansion.

In addition to meeting functional requirements, the system should also follow relevant international and national norms and standards.

Practicality and advancement

Adopt advanced and mature technology to meet the requirements for holding various types of meetings and activities, so that the system maintains technological advancement for a considerable period of time and can adapt to the needs of future development. Give full play to the function and role of each system equipment. To meet the requirements of actual work to the greatest extent, consider satisfying the user's business management as the first element, and adopt the mode of centralized management and control. Design the corresponding system according to actual needs, simplify the design as much as possible on the basis of meeting the functional requirements and technical index requirements, and insist on practicality.

Safety and reliability

In order to ensure the safe and stable operation of the system, each subsystem should adopt advanced, used and mature and reliable products. The technical indicators of all equipment have undergone rigorous testing and aging tests, and all system indicators have undergone scientific calculations and technical demonstrations. Based on the use of hardware backup, redundancy and other reliability technologies, the relevant central control system technology is adopted to provide strong management mechanisms, control methods, fault monitoring and other technical measures to improve the safety and reliability of the entire system.

Interconnectivity

It has the characteristics of interconnection and intercommunication with a variety of audio-visual, control, conference systems and computer systems to ensure that the system can be fully utilized.

Manageability

It adopts intelligent and manageable equipment and advanced central control system management software to realize advanced distributed management. It can monitor and detect the operation of the entire system, quickly determine system faults, improve system performance and reliability, simplify system maintenance, and provide necessary guarantees for system use and management.

Serviceability and convenience

In order to meet the various functional needs of the conference room, the adopted system should be able to fully reflect the safety, advancement, reliability, convenience and efficiency of all aspects of conference room managers and users.

Economy

Under the premise of ensuring the system's advanced, reliable and high-performance price ratio, the most economical goal is achieved through optimized design.

Scalability and maintainability

It is necessary to reserve space for future upgrades of the system. System maintenance accounts for the largest proportion in the entire system life cycle. It is necessary to fully consider the reasonable structure design and standard maintenance of the system can be completed in a very short time. After completion, it should have a good overall audio-visual effect, appropriate style and style. All products should be produced by regular domestic and foreign manufacturers, and the product qualification certificate should be attached.

Section 3 System Architecture
The multimedia conference room is a multi-purpose venue mainly for conferences, speeches, academic experience exchanges, internal commendation meetings, news and product launches. Therefore, the following systems and functions are required:

Paperless conference system;

Conference discussion system;

central control system;

Signal management system;

Conference sound reinforcement system;

display system.

We conduct a detailed plan analysis for the above-mentioned subsystems.

3.1 Paperless conference system

Boao's paperless system is a collection of conference manuscript release, manuscript review, original handwriting annotation, modification, signing, simultaneous viewing of speeches, same-screen interaction, conference service application, participant exchanges and interaction, conference voting, conference control and other functions As an integrated multimedia conference platform. Through the use of mobile tablet terminals or integrated business terminals for business lifting, the conference organizers can save paper and human resources, and truly realize an environmentally friendly, energy-saving, paperless, efficient, and interactive intelligent electronic conference mode.

Through this set of professional conference products, on the one hand, it is possible to "liberate" the vast number of conference organizers within the unit; on the other hand, the application of mobile information technology greatly improves the efficiency of the organization and helps conference organizers greatly reduce work pressure. Easily carry out on-site management and control of the meeting, continue to reduce costs and save time, bring the upgrade of internal management level, and also provide more detailed meeting information for the majority of participants, so that users can obtain comprehensive, efficient, real-time and safe Meeting services, get ubiquitous meeting information experience. At the same time, it saves a lot of printing costs and projection equipment for office units, which is fully in line with the national low-carbon and environmental protection concept.

3.2 Conference Discussion System

The system realizes unified management of the conference speech process through the conference system host, and all microphones in the system are connected in series with single-wire connection technology, and finally to the conference host, as if holding hands. During the exchanges of medium and large group meetings, there are many speakers at the meeting, and the single-line connection technology can ensure that everyone speaks conveniently and at the same time facilitates meeting management. Digital conferences are installed in embedded and desktop formats.

The hand-in-hand conference discussion system can realize functions such as chairperson priority and speech control. The control and management mode of the conference system can be set to automatic or manual. When it is set to manual mode, the delegates of the conference need to apply in advance on the delegate machine when they speak. Participants can continue after their speeches, or the chairperson is authorized to speak, and as the conference chairperson, they can achieve priority functions and cut off the speeches of other representatives.

3.3 Central control system design

With the continuous advancement of science and technology, multimedia conference rooms have more and more demand for audio and video system equipment. Various advanced audio and video equipment and electronic equipment are adopted by customers in order to achieve the desired effect. However, as the number of devices increases, there will be more and more remote controls and more and more control methods, making people confused. At the same time, the control of the environment is difficult to change in time as needed to achieve the desired effect. Therefore, we configure a central control system in the design of the multimedia conference room. This set of fully automatic intelligent equipment central integrated control system can control almost all electrical equipment through touch-type wireless, wired LCD screen or equipped with a tablet computer. Including projectors, paperless conference system official terminal lifting, audio-visual equipment, signal switching, volume adjustment, lighting, curtains, etc. The system mainly uses infrared, RS-232, RS-485, relay, I/O, AXLINK and other connection methods to connect all controlled equipment with the central control system to form a complete system that is reliable and convenient to operate, and provides users with extreme convenience Way of expansion.

3.4 Design of signal processing system

There are a large number of signals in the venue, including video signals such as multi-channel camera monitoring, DVD, VHS, and cable TV, and computer signals such as podium, delegate seats, speaking seats, control room, etc. All the above signals need to be in accordance with the needs of different meetings. Through the projection display to the screen and the monitoring and switching preview of the control room, the signal connection switching requires a complete set of signal processing systems to support the realization of the above functions. The control of the system is also due to the variety of signals, complex operations, and easy to make mistakes. All equipment requirements in the signal system can be controlled through the RS-232 control protocol and programmed to realize the unified control of the intelligent centralized control system. The display device relies on the matrix switcher to uniformly allocate and group the input video signals. Specifically, the video signals of DVD, camcorders, laptops and other video projection devices are sent to the matrix switcher input port. Each video signal is output to local display devices such as large screens, monitors, etc. through the grouping of the switcher. The number of channels of the switching matrix is configured according to the configured video source device and display device.

3.5. Design of sound reinforcement system

In view of the importance of the conference room system engineering design and the need for the audio sound reinforcement system to adapt to different types of meeting formats, in order to make our design more rigorous and accurate, for the sound reinforcement system design method, we use the acoustic simulation software EASE4.1 The method of on-site acoustic simulation design can better improve the design of on-site sound reinforcement. EASE4.1 Acoustics Computer Aided Design Software can perform sound field simulation design (including live podium, listening area model establishment, material pasting, speaker suspension and sound field simulation, etc.).

When designing with EASE4.1 software, we can carry out computer-aided design according to CAD architectural drawings: for the acoustic characteristics of the audience sound reinforcement system, according to the design method and calculation requirements of Article 22.3 of the "Civil Building Electrical Design Code", we adopt At present, the world's most advanced and latest acoustic computer-aided design (CAD) design software "EASE4.1" has been designed and calculated. The design calculation results are given in the form of a color display diagram of the sound field distribution.

According to the drawings and design research of the conference hall, it requires high clarity and language intelligibility for speech sound reinforcement. Therefore, the main speaker adopts a long-stroke active digital speaker array with a controllable full-frequency beam for sound field design. The sound system can radiate powerful direct sound to the listening area and avoid spreading to other sound reflection areas outside the listening area to meet the needs of high-quality listening. Therefore, in order to meet the high-standard construction needs of this conference hall, under the existing conditions, we use the left and right channels to configure the optimization of conference full-range speakers.

Section 4 System case diagram and topology diagram