Absorption coefficient obtained using impedance gun method shows that the absorption coefficient of felt is higher than the absorption coefficient of carpet for mid and higher frequencies. The noise reduction coefficient is the arithmetic average rounded to the nearest multiple of 0 05 of the absorption coefficients for a specific material and mounting condition determined at the octave band center frequencies of 250 500 1000 and 2000 hz. Floor materials 125 hz 250 hz 500 hz 1 khz 2 khz 4 khz.
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