3
Law and
technical standards
nIn Italy the law which rules the occupational noise
control is D.L. n° 277 (1991)
nThis law specifies to make measurement far from the body
of the worker,
for avoiding modification of the sound field, but in the same position where the ears of the worker
happen to be during the normal exposure.
nThis of course is completely unapplicable to the case of
sound produced
by external or in-the-ear headphones
nThis topic is covered by two preliminary standards:
ISO/DIS 11904-1 (2000).
“Acoustics - Determination of sound immissions from sound sources placed
close to the ears - Part 1: Technique using microphones in real ears
(MIRE-technique)”
ISO/DIS 11904-2 (2000).
“Acoustics - Determination of sound immissions from sound sources placed
close to the ears - Part 2: Technique using a manikin
(manikin-technique)”