When someone speaks in a large empty room, speech intelligibility is rather poor, because the sound which is just emitted is mixed with the reverberating sound that was emitted a few tenths of a seconds (or even seconds) earlier. When someone strikes a bell or a similar lightly-damped mechanical system, a sound can be heard for many seconds because it takes rather a long time until the vibratory energy in the system is transferred into heat or radiated.
KeywordsPorosity Foam Autocorrelation Convolution Perforation
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