When sound waves encounter a sound barrier in the process of propagation, three phenomena will occur: reflection, transmission and diffraction. Usually, the barrier can prevent the propagation of direct sound, so that the transmitted sound can be fully attenuated, and the influence of the transmitted sound can be ignored. Therefore, the sound insulation effect of the sound barrier can generally be expressed by noise reduction, which embodies the above two sound insulation capabilities of the sound barrier. Insert a sound barrier between the sound source and the receiving point, and set the sound barrier to infinity. Sound waves can only be diffracted from above the barrier, and then form a shadow area, just as light is blocked by an object to form a shadow. In this sound shadow area, people can feel that the noise is obviously weakened, which is the noise reduction effect of the sound barrier.
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