ASTM E413隔音等级的分类
日期:2012-02-08 11:00
ASTM E413 Classification for Rating Sound Insulation
ASTM E413隔音等级的分类
These single-number ratings correlate in a general way with subjective impressions of sound transmission for speech, radio, television, and similar sources of noise in offices and buildings. This classification method is not appropriate for sound sources with spectra significantly different from those sources listed above. Such sources include machinery, industrial processes, bowling allies, power transformers, musical
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