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IS0
1 N TER NAT1 O N AL O R GAN I ZATl O N
F O R STAN DAR D I ZATl O N
I SO RE COM M EN DATI ON
R 357
EXPRESSION OF THE POWER AND INTENSITY LEVELS
OF SOUND OR NOISE
This IS0 Recommendation is supplementary to
IS0 Recommendation R 131 -
Expression of the Pysical and Subjective Magnitudes of Sound or Noise
1st EDITION
December 1963
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 357, Expression of the Power and Intensity Levels of Sound or
Noise, was drawn up by Technical Committee ISO/TC 43, Acoustics, the Secretariat of which is
held by the British Standards Institution (B.S.I.).
Work on this question by the Technical Committee began in 1960 and led, in 1961, to the
adoption of a Draft IS0 Recommendation.
In March 1962, this Draft IS0 Recommendation (No. 504) was circulated to all the IS0
Member Bodies for enquiry. It was approved by the following Member Bodies:
Australia Denmark New Zealand
Austria Finland Poland
Belgium France Portugal
Brazil Germany Switzerland
Burma Hungary Swe
...