EN 12354-3:2000

Foreword
1 Scope
2 Normative references
3 Relevant quantities
    3.1 Quantities to express building performance
          3.1.1 Apparent sound reduction index
                  R'[45 degrees]
          3.1.2 Apparent sound reduction index
                  R'[tr,s]
          3.1.3 Standardized level difference
                  D[2m,nT]
          3.1.4 Normalized level difference
                  D[2m,n]
          3.1.5 Relations between quantities
    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 Other relevant data
    3.3 Other terms and quantities
4 Calculation models
    4.1 General principles
    4.2 Determination of direct transmission from
          acoustic data on elements
          4.2.1 Small elements
          4.2.2 Other elements
    4.3 Determination of flanking transmission
    4.4 Interpretations
    4.5 Limitations
5 Accuracy
Annex A (normative) List of symbols
Annex B (informative) Determination of transmission
        by elements from composing parts
Annex C (informative) Influence of facade shape
Annex D (informative) Sound reduction index of elements
Annex E (informative) Estimation of indoor sound levels
Annex F (informative) Calculation examples
Bibliography

This document describes calculation models designed to estimate the reduction of outdoor sound by facades of buildings, primarily on the basis of measured data which characterizes the sound reduction index of the relevant elements. The models given are applicable both to calculations in frequency bands and to calculations with single number ratings of the products.