The construction of a standard recording and recording classroom for recording and broadcasting classrooms is equivalent to a simple TV studio, but it is not exactly equivalent to a TV studio. The common point is that it needs to meet the professional technical requirements of sound construction and lighting that are basically consistent with the TV studio. The difference is that the recording and broadcasting classroom needs to maintain the normalization of the classroom as much as possible in terms of appearance and environment layout. In order to ensure the overall recording and broadcasting effect, the entire recording and broadcasting classroom should meet the following construction standards in terms of environment, sound construction and electrical.
1. Environmental requirements The temperature and humidity in the recording classroom should be appropriate. The room temperature is 18-22 °C, and the humidity is 60%-80%. Maintaining the proper temperature and humidity in the room is the basic condition for ensuring the reliable and stable operation of the recording and broadcasting equipment and the normal teaching order in the classroom during the recording process. A low-noise air conditioning system must be installed in the recording and broadcasting classroom to achieve the functions of heating, humidifying, cooling, dehumidifying and ventilating. The classroom requires fresh air, and the amount of air per person per hour is not less than 18 cubic meters.
2. Jiansheng Environment The entire recording and broadcasting system uses a ceiling-mounted professional gun-type microphone to collect sound. Although the professional gun-type microphone has strong directivity and strong isolation function for peripheral noise, the recording distance is relatively long, so the recording classroom is required to have good sound insulation effect and have as little reverberation time as possible. In addition, to ensure clear sound, reduce the noise inside the classroom equipment. For example, if the noise of the air conditioner is too large, the performance of the audio system will be greatly affected. It is difficult to hear the voice of the teacher and the student in the recorded file, which affects the recording effect.
At the same time, in order to avoid the influence of system equipment running noise on the pickup, the recording and broadcasting classroom needs to have an independent equipment control room, and ensure that the control room can effectively soundproof. To build sound, we must meet the following standards: 1 Sound insulation. Try to make the classroom and the external sound wall: It is recommended to adopt a professional acoustic decoration scheme. The color is recommended to be warm yellowish, mainly in the first row of the third or fourth row. Floor: It is recommended to use 4.5mm thick sports mute pad. The mat is very quiet, and it is durable and easy to clean. It is the most widely used floor material in the studio. Color requirements see the effect map ground blue. Windows: It is recommended to install a double-layer aluminum alloy form to isolate the incoming sound. Curtains: It is recommended to install sound-proof thick material curtains, see the effect picture, the color can be matched with the appropriate color according to the color of the classroom decoration. Door: It is recommended to install a professional anti-theft soundproof door to control the incoming sound of the outside world and reduce indoor environmental noise.
3. Lighting and lighting system plays an important auxiliary role in the automatic recording and broadcasting system. It is one of the important factors for recording high-quality picture effect files. For this: Teacher lighting and platform lighting use professional three The basic color electric flip-type surface light 2~4 group, the student lighting uses the ordinary grid light, in order to make the filming style of the teacher and the student uniform, it is recommended that all the light sources adopt the three-color color tube (5600k) with the same color temperature. In addition, the window is equipped with curtains and a light-shielding layer is installed to avoid mixing of light sources of different color temperatures. The minimum illumination in the studio needs to reach 500LX or more.
4. The power supply system recording and broadcasting classroom equipment can work under 220V/50Hz AC power, and the voltage allowable range is 220V±10%. In order to extend the service life of the equipment, it is recommended to configure UPS uninterruptible power supply of 3000W or more for each system. In order to ensure the safety and reliability of the power supply system in the classroom, in order to reduce the electrical crosstalk caused by the power supply path, three sets of power supply systems should be used. A power supply system is used as classroom lighting power supply; the second power supply system serves as the entire multimedia teaching equipment, controls the equipment in the cabinet, and uses an uninterruptible power supply system (UPS); the third power supply system is used for power supply of air conditioners and the like. The power supply system is designed according to the three-phase five-wire system, that is, the neutral line of the AC power supply of the system is not shared with the protection ground of the AC power supply and should be strictly separated.
5. Classroom location recording and broadcasting classrooms are required for normalized teaching, so they are picked up by a pickup microphone. Therefore, the following requirements should be met in the selection of recording and recording classrooms in order to obtain good image shooting effects and reverberation effects. 1 The area is not more than 90 square meters. 2 The surrounding environment of the classroom is quiet, and the doors and windows have good sound insulation. 3 The classroom is rectangular in design, and the classroom is contoured before and after. It is not a stepped classroom. 4 After the ceiling of the classroom, the height of the ceiling is not less than 2.8M.
6, classroom decoration color 1 classroom wall color is uniform, can not be installed reflective materials. The 2 color system is light in color. Such as light gray, light yellow. 3 The curtains are made of non-reflective materials and are effective in isolating natural light.
The New Wande 8600 recording and broadcasting machine integrates recording, recording and broadcasting into one. It is suitable for comprehensive application of campus TV stations. It can be broadcasted, recorded and broadcasted, and used in one machine. It is easy to operate and cost-effective. New Wande series automatic recording and broadcasting system, integrated high-definition camera, pan-tilt control automatic shooting, high-sensitivity tracking and positioning, video and audio full interface cutting and other functions, can be applied to modern teaching real-time recording. The Jianchang Institute of Technology in Huludao City, Liaoning Province, the second Zhongguancun in Beijing, and the Fengtai Experimental Primary School in Beijing have all adopted the recording and broadcasting system of Cree.
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