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  1. The distortion of a wavefront caused by the presence of an obstacle in the sound field.
  2. Process that produces a diffracted wave. Source: Glossary of Terms in Noise Control Engineering
  3. A change in the direction of propagation of sound energy in the neighborhood of a boundary discontinuity, such as the edge of a reflective or absorptive surface. Source: http://www.owenscorning.com/around/sound/glossary.asp

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