Foreword
1 Scope
2 Normative references
3 Relevant quantities
   3.1 Quantities to express building performance
        3.1.1 Sound power level L[w]
        3.1.2 Directivity correction D[c]
   3.2 Quantities to express element performance
        3.2.1 Sound reduction index R
        3.2.2 Element normalized level difference
                 D[n,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 L[p]
        3.3.2 Total attenuation due to propagation
                 A[tot]
        3.3.3 Diffusivity term C[d]
        3.3.4 Inside sound pressure level L[p,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