Sound evil can be roughly divided into external evil and internal evil.
1, external noise refers to noise problems from the external environment, such as the sound of shopping malls, school broadcasts, the noise of factory machinery operation or the sound of rain and thunder.
2. Endogenous evil generally refers to the sound that interferes with life caused by building structure or equipment.
The way to solve the sound evil is generally to use sound insulation and feng shui array to solve it.