NEN EN ISO 14257 : 2001

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sound distribution in a room
  4.1 General
  4.2 Spatial sound distribution curves
5 Measurement of the spatial sound distribution curve
  5.1 Specifications regarding the sound source used
      for the test
  5.2 Measurement instrumentation
  5.3 Measurement path and points
  5.4 Measurement procedure
  5.5 Representation of the measured data
6 Parametric description of the measured spatial sound
  distribution curve in view of evaluation of the acoustical
  performance of workrooms
  6.1 General
  6.2 Distance ranges
  6.3 Determination of the rate of spatial decay of sound
      pressure levels per distance doubling, DL[2]
  6.4 Determination of the excess of sound pressure level
      with respect to a reference sound distribution curve,
      DL[f]
  6.5 Evaluation of measured data
7 Information to be recorded and reported
Annexes
A (normative) Performance requirements for the sound source
  to be used for the test
B (normative) Correction of measured sound distribution curves
  to account for differences in ground reflections and
  source directivity
C (informative) Example of use of this International Standard
Bibliography

Gives a method for measuring the spatial sound distribution curve(s) of a given workroom. Applies to workrooms of any shape and any dimensions provided that the number of microphone positions allows the regression calculation to be performed.