Abstract
In order to reject ambient noise, surface microphones were developed by placing absorbent enclosures around nondirectional microphones. The advantages and errors of this method are discussed. A sound diffusing box is used to calibrate these microphone enclosures. The correction factors are qualitatively analyzed for a cylindrical enclosure. The sound diffusing box was used to measure the transmission loss of some materials. A directional (cardioid) microphone placed inside the sound diffusing box was used to measure directly the reflected sound energy of small samples of materials. A method for converting these measurements to absorption coefficients is described.
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