降噪系数是在250、500、1000、2000Hz测得的赛宾吸声系数的平均值。
结果表明材料的平均吸声系数和降噪系数分别达0。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to 0.
低密度和高度多孔的基底是高度吸音的，从而显示出大于或等于约0.80的降噪系数，NRC值。
The low density and highly porous substrate is highly absorbing, exhibiting noise reduction coefficients, NRC values of about 0.80 or greater.
结果表明材料的平均吸声系数和降噪系数分别达0。58和0。60，且材料的中低频吸声性能优良。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.
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