DS DS/EN ISO 1683
DS DSEN SO 1683 2008-SEP-04 Acoustcs - Preferred reference values for acoustcal and vbratory levels
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This International Standard specifies reference values used in acoustics, in order to establish a uniform basis for the expression of acoustical and vibratory levels. The reference values are mandatory for use in acoustics for airborne and structure-borne sound, but may also be used in other applications.