EN ISO 354:2003

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Frequency range
6 Test arrangement
  6.1 Reverberation room and diffusion of sound field
  6.2 Test specimens
  6.3 Temperature and relative humidity
7 Measurement of reverberation time
  7.1 General
  7.2 Interrupted noise method
  7.3 Integrated impulse response method
  7.4 Evaluation of reverberation times based on decay
      curves
8 Expression of results
  8.1 Method of calculation
  8.2 Precision
  8.3 Presentation of results
9 Test report
Annex A (normative) - Diffusivity of the sound field in the
                       reverberation room
Annex B (normative) - Test specimen mountings for sound
                       absorption tests
Bibliography
Annex ZA (normative) - Normative references to international
                       publications with their relevant European
                       publications

ISO 354:2003 specifies a method of measuring the sound absorption coefficient of acoustical materials used as wall or ceiling treatments, or the equivalent sound absorption area of objects, such as furniture, persons or space absorbers, in a reverberation room. It is not intended to be used for measuring the absorption characteristics of weakly damped resonators.The results obtained can be used for comparison purposes and for design calculation with respect to room acoustics and noise control.