The wedge absorber is a kind of sound absorber. Because its sound absorption area at the end is small, its acoustic impedance gradually increases from the characteristic impedance close to the air to the impedance close to the porous material, and the impedance gradually increases from small to relatively small. The change is not significant. Therefore, when the sound wave is incident from the end, due to the gradual transition of the sound absorbing layer, the acoustic impedance of the material can be well matched with the acoustic impedance of the air, so that most of the incident sound waves enter the material and are efficiently absorb.
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