Basic requirements of conference audio decoration
The fullness of the voice
Plumpness refers to the enhancement and contrast of direct sound due to the reflected sound of each interface when listening to music in the hall. A hall with acoustic design should give people a feeling of massiness, roundness, warmth, elasticity and intimacy. Therefore, we strive to make the electronic sound reinforcement system of this multi-function hall have enough loudness and brightness, moderate mid-high frequency sound, bright without stabbing, sufficient mid-low frequency energy and good transient response when working in full field.
Brightness and clarity of voice
The brightness and clarity of sound mainly means that there are many high-frequency components, slow attenuation and rich higher harmonics in the sound. This is of great help to the expression of language and the level of music, giving the audience a clear and bright feeling, just like a pool of clear water, looking at the end at a glance.
Uniform distribution of acoustic energy
The sound energy distribution at all points in the whole hall is uniform, that is, the sound field distribution is uniform, which can ensure that the loudness heard by the audience in each area is basically the same. In a hall with uniform sound field, the difference between maximum sound pressure level and minimum sound pressure level is less than 6dB, and the difference between maximum sound pressure level (or minimum sound pressure level) and average sound pressure level is less than 3dB. In the sound quality design, the following measures can fully diffuse the sound and make the sound energy distribution more uniform.
Appropriate reverberation time
The sound quality of the hall has a great relationship with reverberation time. Appropriate reverberation time can improve language clarity and timbre fullness. Near-reflected sound helps to strengthen the direct sound, especially the reflected sound of the inner wall of the hall, and plays an important role in the sense of space and loudness of the sound. In a large hall, the near-reflected sound can be used to make the sound field uniform.
Noise and feedback control
In the design of hall sound reinforcement system, the most headache is the background noise and microphone feedback of the system. As far as sound structure is concerned, because the target part is an irregular cuboid, it is easy to form normal standing waves. Therefore, we suggest that the owner should fully consider the design of building materials and use surface decoration with appropriate sound absorption coefficient in the hall decoration, so as to obtain moderate early reflected sound, avoid harmful reflected sound and reduce the sound field conditions of sound feedback.
Design requirements of conference lighting system
Lighting design of conference room is the key factor to obtain satisfactory visual effect. A well-designed meeting room can not only provide a comfortable meeting environment for the participants, but also achieve a better sense of presence and improve the effect of the meeting. At the same time, the illuminance of lighting is the basic necessary condition of the conference room. Due to the uncertainty of meeting time and the special requirements of each system for light, natural light should be avoided as much as possible and artificial light sources should be used. The doors and windows of the conference room should be covered with dark curtains. If people are sitting in the bright light of the conference room, there will be little or no light on their faces, and bright light will also cause obvious shadows on their faces. Therefore, the lighting layout must be reasonable, the light source should have no bad influence on people's vision (no dazzling feeling), and the light distribution on the face should be uniform.
Lighting requirements of multimedia conference lights
The light source in the conference room should have no bad influence on people's vision. Therefore, it is more appropriate to choose three-color lights. At the same time, the lighting requirements of the meeting room are as follows:
A) In order to ensure the correct image tone and the camera's self-balance, it is stipulated that the light shining on the participants' faces is uniform, and the illuminance is not less than 500lux. The illuminance near the monitor and projection TV is 50-80lux, so direct light should be avoided.
B) The direction of light is more important than the intensity of light. Installing a diffusion lens for the light can fully diffuse the light and make the participants' faces evenly illuminated.
Installation and layout requirements of multimedia conference lighting
Tri-color lights are generally installed on the ceiling of conference rooms. An L-shaped frame should be installed on the ceiling, and the lamp should be installed at the corner of the L-shaped frame, so that the light does not directly illuminate the objects and participants, but illuminates the conference room through the reflection and scattering of the light from the ceiling. Avoid direct sunlight on objects, backgrounds and lenses. Auxiliary lighting is recommended when the light is weak, but direct light should be avoided. Auxiliary lighting, using daylight lighting. Avoid direct light from the top or the side of the window, which will directly produce shadows. Indirect light sources or softer light reflected from flat walls are recommended.
In order to prevent color from stealing light and reflecting light, the background wall should be designed separately, and it is best to use a uniform light color, usually beige or gray, instead of using a frame. It is forbidden to use chaotic colors with strong contrast to facilitate the setting of camera lens aperture.
The other three walls, floor and ceiling of the room should match the color of the background wall, and saturated colors of black or bright colors should be avoided, generally light blue and light gray. It is not suitable for each wall to use complex patterns or hang complex frames, so as to avoid image blurring when the camera moves or zooms, and at the same time increase coding overhead. It is best to seal the windows or install brown glass, or hang thick cloth curtains to prevent direct sunlight.
Meet the requirements of system decoration
The layout of the meeting room/classroom should be generous and concise, which can realistically reflect the people and meeting environment at the scene, so that the participants have a sense of presence and unity, and achieve good visual and verbal communication.
The images transmitted in the meeting room/classroom include people, landscapes, charts, words, etc. , should be able to clearly identify. The meeting room/classroom should maintain proper temperature, humidity and air circulation to make the participants feel comfortable and natural. In order to ensure the viewing effect of the image and prevent the color from causing "striking" or "reflecting" effects on people's photography, the background wall should adopt a single and uniform light color. Other walls, tablecloths, carpets, ceilings, etc. The meeting room should match the background wall, and the background wall should not use frames. It is suggested that tables, chairs and walls should be light camel or light cyan. The chair should not be sofa-shaped or high-backed, so as not to block the participants behind.
One of the main factors affecting the picture quality is the scenery and colors around the site, as well as the colors of tables and chairs. Generally do not use colors such as "white" and "black". These two colors will have adverse effects on human body, such as "reflecting light" and "stealing light". Therefore, it is more appropriate to use light colors around walls, tables and chairs, such as beige around walls, light green and light brown around tables and chairs. The south should use cool colors and the north should use warm colors. Landscape painting and other scenery should not be hung on the camera background (the wall behind the subject), otherwise it will increase the information of the camera object, which is not conducive to improving the image quality.