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