One of the conditions to hear a purely excellent sound is to have an environment that does not interfere with noise, which requires a reduction in the noise of the listening room. At present, in order to reduce various noises in the audio-visual room, in addition to laying sound-absorbing materials to stop sound absorption, it is also possible to adopt sound insulation and vibration isolation measures. Separate the sound absorption from the sound insulation.
Generally speaking, the noise of the listening room is mainly external noise. The external noise mainly includes urban noise (traffic and vocal), noise in other rooms in the building, and noise generated by the air conditioning system. In order to reduce these noises, the listening room should be chosen in a quiet environment, and the interference between the rooms should be minimized.
There are two main ways in which noise can be transmitted into the room. One is the noise that the incident wave of sound is transmitted into the room through the wall, and then transmitted to the room through the air medium, and the noise that is transmitted through the air holes such as the door slit, the window gap, and the air-conditioning duct; the other is the vibration noise, which is Other buildings with solid connections on the building are vibrated by impact and propagated into the room along the solid interface.
The sound insulation measures must be targeted. The engineering that stops the isolation of the sound transmission path is often called the “sound insulation” project. The engineering that stops the isolation of the “vibration sound” is often called the “isolation vibration” project sound.
Generally, the heavier the sound insulation data (higher density), the thicker the better, the design is double-layer door, double-wall and other effects are better, the detailed sound insulation measures often used are as follows:
1. Wall: The wall should be thick and heavy in order to improve the ability to isolate the sound of the air. If possible, double wall can be set. When the sound absorbing panel is placed on the inner side of the wall, it should be spaced from the wall, and it is essentially a double wall.
2. Ceiling and carpeting: If the listening room is located in the middle of a high-rise building, noise from upstairs and downstairs can be transmitted to the listening room through the ceiling and floor. In order to reduce the vibration sound that is transmitted into the room through these channels, a ceiling can be provided to isolate the noise from the sky, and the floor can be laid to isolate the noise from the air.
3. Door and window joints and pipes: It is able to stick sealing strips on door joints and window joints. This is the easiest way to dispose of sound insulation.
4. Doors and windows: Setting the sound insulation door and window is the key to noise reduction. The transmission loss of a door depends on its weight, hardness and density. The sound insulation of ordinary wooden doors is 18dB, which increases the weight and thickness of the door and improves the sound insulation. If a double-layered door is installed and the sound-absorbing material is filled in the middle, the sound absorption effect can be significantly improved.
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