These curves relate to the efficiency of the felt in its effecton general reverberation. Its efficiency in the reduction of a dis-crete echo is dependent to an even greater degree on its locationthan on pitch. MUSICAL PITCH 215 The above are the coefficients of absorption for most materialsusually… … Pig. 5. Double dependence of absorbing power on pitchand on location, showing one of the sources of errorwhich must be guarded against in the determination ofcoefficients of absorption and in the use of absorbingmaterials. 216 BUILDING MATERIAL It is necessary for such experiments that rooms…
Architectural acoustics
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