1 Scope
2 Normative references
3 Terms and definitions
4 Sound distribution in a room
4.1 General
4.2 Spatial sound distribution curves
4.2.1 Reference spatial sound distribution
curves
4.2.2 Spatial sound distribution curves in
frequency bands and for a given
frequency spectrum
4.2.3 Frequency-normalized spatial sound
distribution curve C
5 Measurement of the spatial sound distribution curve
5.1 Specifications regarding the sound source used
for the test
5.1.1 Performance requirements to be met by the
source
5.1.2 Calibration and verification of the sound
output of the source
5.1.3 Location of the source
5.1.4 Sound output versus background noise
5.1.5 Verification of a spatial sound
distribution curve
5.2 Measurement instrumentation
5.3 Measurement path and points
5.3.1 Measurement path
5.3.2 Measurement points
5.4 Measurement procedure
5.5 Representation of the measured data
5.6 Factors influencing the measurement results
6 Modelling of the measured spatial sound distribution
curve in view of the evaluation of the acoustical
performance of workrooms
6.1 Distance ranges
6.2 Determination of the rate of spatial decay of
sound pressure levels per distance doubling.DL2
6.3 Determination of the excess of sound pressure level
with respect to a reference sound distribution
curve, DLf
6.3.1 Value of the excess of sound pressure
level over a distance range [rn,rm]
and in a given octave band
6.3.2 Value of DLf'r of DLf at a specified
distance r and for a given octave band
6.4 Evaluation of the measured data
7 Information to be recorded and reported
Annex A (normative) Performance requirements for the
sound source to be used for the test
Annex B (informative) Example of use of this International
Standard
Bibliography