BS EN 12354-4:2000

Foreword
1 Scope
2 Normative references
3 Relevant quantities
      3.1 Quantities to express building performance
             3.1.1 Sound power level Lw
             3.1.2 Directivity correction Dc
      3.2 Quantities to express element performance
             3.2.1 Sound reduction index R
             3.2.2 Element normalized level difference
                      Dn,e
             3.2.3 Insertion loss D (of an element)
             3.2.4 Other relevant data
      3.3 Other terms and quantities
             3.3.1 Sound pressure level Lp
             3.3.2 Total attenuation due to propagation
                      Atot
             3.3.3 Diffusivity term Cd
             3.3.4 Inside sound pressure level Lp,in
             3.3.5 Substitute point source
4 Calculation model
      4.1 General principles
      4.2 Determination of substitute point sound sources
      4.3 Determination of the sound power level for a
             substitute point source
      4.4 Determination of the directivity correction for
             a substitute point source
      4.5 Limitations
5 Accuracy
Annex A (normative) List of symbols
Annex B (informative) Interior sound field
Annex C (informative) Sound reduction index
Annex D (informative) Directivity of sound radiation
      D.1 - Plane radiator
      D.2 - Openings
Annex E (informative) Simplified model to predict exterior
                      sound pressure levels
Annex F (informative) Application of the model to single
                      number ratings
      F.1 - General
      F.2 - Input data
      F.3 - Model for single number ratings
      F.4 - Limitations
Annex G (informative) Calculation example
      G.1 - Situation
      G.2 - Results complete model
            G.2.1 - Substitute point sources
      G.3 - Results from simplified model

Describes a calculation model for the sound power level radiated by the envelope of a building due to airborne sound inside, primarily by means of measured sound pressure levels inside the building and measured data characterizing the sound transmission by relevant elements and openings in the building envelope. Does not cover outdoor sound propagation.

This European Standard describes a calculation model for the sound power level radiated by the envelope of a building due to airborne sound inside that building, primarily by means of measured sound pressure levels inside the building and measured data which characterize the sound transmission by the relevant elements and openings in the building envelope, form the basis for the calculation of the sound pressure level at a chosen distance from a building as a measure for the acoustic performance of buildings.