Abstract
Chapter 7 illustrates the three fundamental sound/object interations: reflection, absorption, and transmission. Beginning with a discussion of the interaction of sound with perfectly reflecting infinite surfaces, the chapter segues into a treatment of reflections from finite objects and from there moves to absorption mechanisms including porous absorbers, nonporous absorbers, and resonant absorbers. The behavior of reflections as a function of angle in free and reverberant fields is treated along with reflections from curved surfaces. Impedance tube measurements and the testing of absorption coefficients for various materials are examined and lists of coefficients are given.
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