Reflection is a phenomenon in which an acoustic wave encounters an obstacle or a medium different from the original medium when it propagates. When the size of a reflector is larger than one wavelength, a virtual image of the sound source is formed. When a concave surface is reflected, an acoustic focusing phenomenon occurs. The local volume in the space on the same side of the source is enhanced; when the convex surface is reflected, the sound is divergent; when the diffuse reflection occurs, the sound reflection is disorderly, and a variety of acoustic defects can be eliminated.
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