Compared with the deployment of desktop systems, conference rooms have more stringent requirements in terms of equipment configuration, system debugging, and environmental requirements. Through the good cooperation between equipment, systems, and environments, high-quality sound can be brought to users. Enjoy video exchange.

From the aspects of system deployment and device configuration, the conference room deployment details include environment design, video input and output, audio input and output and other parts.

Environmental design

In the conference room design, in order to achieve a good effect of the video conference, the environmental design of the conference room is a very important part. In addition to providing a comfortable meeting environment for the conference participants, the conference room must also realistically reflect the people and scenes on the scene. Etc., so that participants have an immersive experience, so in terms of environmental settings, the following factors should be considered:

●Structural layout: The net height of the conference room is preferably more than 3 meters, and the length and width ratio is controlled to 3:2.

● Temperature and humidity: The temperature and humidity in the conference room should be appropriate. Usually, it should be set to 18 to 25 degrees Celsius, 60% to 80% humidity, and ensure that the indoor air is fresh.

● Noise control and acoustic processing: For acoustic processing, the following factors should be considered: frequency characteristic control, echo control, and noise control. Frequency and echo control, through the control room's mixer, with the addition of high-quality power amplifiers, control high, medium and low-pitched; and can be placed around the venue through the speaker, so that participants have an immersive feeling. Noise control is mainly the control of sound insulation and sound absorption. Sound insulation mainly refers to the use of double-layer windows to isolate external noise. The main components of some electrical equipment are installed in the control room to avoid the noise of inductive electrical equipment. The sound absorption refers to indoor carpeting and hanging. The ceiling, the walls around the conference room should not be too smooth, it is best to have soundproofing materials and soft cloth to ensure that the indoor noise is less than 40 decibels. The microphone and speaker should be kept at an appropriate distance and direction to reduce the echo of the conference room to form a good meeting environment.

● Hue and color: The color of the scene around the venue, the color of the table and chair, etc., generally should not use the "white" and "black" colors, these two colors will have the adverse effect of "reflective" and "absorbed". Therefore, the walls, tables, chairs, etc. should be light shades. It is not appropriate to hang landscapes such as landscape paintings on the background of the camera (the wall behind the person being photographed), otherwise the information volume and network traffic of the camera object will be increased, which is not conducive to the improvement of image quality.

● Light source and illumination: The light source and illumination of the conference room are the basic requirements for the conference room. The general camera has an automatic color equalization circuit that can provide true natural color. The high light incident from the window will produce a video image with blue projection and red shaded area; on the other hand, the conference holding time is random. In the morning and afternoon, the natural light source illumination and color temperature are different. Therefore, the conference room should avoid the use of natural light sources, but artificial light sources should be used, and all windows should be covered with curtains. When using an artificial light source, a cold light source should be selected, such as the "three primary color lights" (R, G, B).

Video equipment

●Video input device

Commonly used video input devices mainly include digital cameras and analog cameras, and digital cameras are generally recommended for desktop-level applications. Digital cameras are relatively inexpensive and easy to carry, but they are very weak in terms of focus adjustment, wide-angle, light compensation, pan/tilt rotation, remote control and remote control, so they are not suitable for use in conference room level. A combination of analog camera + capture card is recommended for this application.

There are many types of analog cameras, ranging from a few hundred yuan surveillance cameras to tens of thousands of professional cameras. In these products with various types and different prices, pay attention to the selection of products with better cost performance.

●Video output device

As a conference room-level application, video output devices usually use high-definition television, rear projection or projectors to provide users with a clear, realistic and comfortable visual experience. When the user uses the TV set and the rear projection as the output device, the graphics card of the conference room terminal PC device must have a video output or S terminal/DVI output, and is connected to the television through a video cable or an S terminal cable.

 Audio equipment

One of the problems often encountered in conference room applications is the negative impact on the performance of the conference due to inadequate handling of sound problems, such as howling, self-excitation, echo, noise, etc., and these problems may involve more Links, including the environment, sound card, audio input and output devices.

● Sound card selection and setting

The application of the video conferencing system has higher requirements on the full-duplex performance of the client's sound card. However, the sound card of the currently widely used PC is generally a motherboard integrated sound card, which sometimes causes problems due to its own design or manufacturing process. Line crosstalk (that is, when there are input and output signals at the same time, there will be interference between each other), this crosstalk will bring noise, howling, echo, etc., which seriously affects the normal progress of the conference (this phenomenon is usually in peacetime) It is difficult to find out when listening to music or recording with this sound card, because these operations are more of a simplex process. Therefore, for conference room-level equipment, it is recommended to replace it with an independent sound card to ensure sound quality and sound effects.

●Selection of audio equipment

Audio equipment includes sounding equipment, sound reproduction equipment and mixing consoles, feedback suppressors and other processing equipment.

The possible effects of the sound production system mainly include howling interference and system echo interference formed by the microphone and the speaker. The howling interference is mainly caused by the whistling sound of the speaker's noise absorbed by the microphone, which can be adjusted by adjusting the microphone direction or the speaker volume. The system echo interference is caused by the repeated recovery of the system sound. Assuming that there are three points A, B, and C participating in the video conference, all of them are in the speaking state, and all of them are played through the speaker, there may be the following situation: A speaking At the same time, B and C are played through the speaker, because the sound absorption effect of the venue is not good, so the sound of the A played by the speaker is absorbed by the microphone of B and C, so that A may hear from B and C. The sound returned by the far end is a system echo, and the sound effect of the whole system will become extremely poor. It can be seen that the defects of the sound system will have a serious impact on the sound of the entire video conference system.

For the sound system of the conference room, on the one hand, the voice of the speaker of the venue needs to be played out, and the remote sound in the conference system needs to be played out. Therefore, the influence of the sound system on the conference sound is mainly caused by the unclearness or the large disturbance caused by the quality problem of the venue mixer. It is recommended to choose a better wire and tuning equipment to ensure the quality of the system sound.

● Handling of conference room echo

Hardware processing method

The feedback suppressor is a common device for solving the echo problem in the conference room level application. It has many varieties, ranging from several hundred yuan to several tens of thousands of dollars. The solution effect and product performance, professional debugging experience and complex echo generation. The degree is very relevant. If the conference room is equipped with a more professional mixer, equalizer, etc., the effect is better.

Depending on the user's application environment, different hardware devices can be selected. In general applications, the equalizer with echo suppression function can also achieve the effect of echo suppression, and can be equipped with a separate feedback suppression device.

Meeting room deployment recommendations

According to the size of the conference room, it can be divided into two typical conference rooms: medium and large conference rooms and small conference rooms.

The medium and large conference rooms are about 150-250 square meters, generally in the classroom layout, that is, the main personnel and leaders are seated on the podium, and the participants sit under the stage. The layout and equipment placement of the situation is shown in the figure. .

According to the needs of users, large conference rooms will also be arranged in the form of round tables in some cases. The small meeting room area is about 40 to 80 square meters, and the conference room is a round table layout.