The standing wave is caused by the reflection of the wall and is reflected back when the sound is transmitted to the wall through the air. The sound of the reflected sound of some frequencies is exactly the same as the source sound, then the sound of this frequency will be strengthened, so the sound of this frequency will become larger, and the sound of some frequencies will be exactly the same as the source sound. It is the opposite direction of vibration, so the sound at this frequency is weakened.
Almost any room has standing waves, but the degree is light and heavy. The walls are parallel to each other, the ceiling and floor are parallel to each other, and there are no large obstacle rooms in the room. Usually there are serious standing waves. In different locations in the room, there are different standing waves. Let's take a picture of a measured picture. In a small, empty, long-shaped room, use a speaker to play a sweeping signal, at the position of the sound engineer. The measurement microphone is recorded in the corner of the back of the room to measure the standing wave of the same.
The size of the house is different, and the situation of standing waves is different. In theory, the standing wave phenomenon in a large room is flatter than in a small room, as it is in practice. The figure below shows the standing wave condition (roughly schematic) caused by the sound reflection of two different sized rooms. The above is the sound wave interference caused by the big room, the following is caused by the small room. Relatively speaking, the sound interference of a large room is much smoother. This is one of the reasons why the acoustics of a large studio is better than a small studio. China Home Theater Network WeChat: cnhifi.
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