ISO 14257:2001 PDF

Scope: This International Standard specifies a method for measuring the spatial sound distribution curve(s) of a given workroom. A method is given for determining, from the measured data, two descriptors of the acoustical performance of a workroom regarding noise control: i.e. the excess of sound pressure level with respect to a free field, and the sound pressure level decay per distance doubling. This International Standard does not deal with assessment of the acoustical quality with respect to speech communication or other psychological factors. This International Standard is applicable to workrooms of any shape and any dimensions provided that the number of microphone positions allows the regression calculation to be performed.

ISO 14257:2001 Referenced Document

IEC 60651 Sound Level Meters (Edition 1.2; Edition 1:1979 Consolidated with Amendments 1:1993 and 2:2000; Replaced by IEC 61672-1:2002 and IEC 61672-2: 2003)
IEC 60804 Integrating-averaging sound level meters
IEC 61260 Amendment 1 - Electroacoustics - Octave-band and fractional-octave-band filters
ISO 3741 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms*， 2010-10-01 Update
ISO 3744:1994 Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essentially free field over a reflecting plane
ISO 3745 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for anechoic rooms and hemi-anechoic rooms — Amendment 1*， 2017-04-04 Update
ISO 6926 Acoustics — Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels — Amendment 1*， 2020-11-23 Update

2001 ISO 14257:2001 Acoustics - Measurement and parametric description of spatial sound distribution curves in workrooms for evaluation of their acoustical performance