由于声波在遇到障碍物时会发生反射现象，故在声源和接收者之间插入密实的屏障会降低噪声。
Due to the reflection of sound waves when they encounter obstacles, inserting a dense barrier between the sound source and the receiver will reduce the noise.
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由于声源具有波动特性，所以总有一部分声波从声屏障的顶端绕射过去，这使得声屏障的衰减受到了一定的限制。
Due to the fluctuation characteristics of the sound source, a part of the sound wave diffracts from the top of the sound barrier, which limits the attenuation of the sound barrier.