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2. Auditory effects of noise
2.1 Discomfort
The loudness scales that characterize the subjective intensity of perceived sounds can be obtained either by comparing a pure tone of any frequency with a 1,000 Hz tone giving the same level sensation (phone scale), or by pairwise comparison of sounds of the same frequency, one of which gives a level sensation twice that of the other (sones scale). Both forms of analysis reveal non-linearities in intensity perception in relation to the physical level of the stimulus.
So a 60 dB sound at 2,000 Hz will be judged twice as intense as a 50 Hz sound at the same level.
It is precisely to take account of this auditory filtering effect that weighting curves have been introduced. Their role...
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Auditory effects of noise
Non-auditory effects of noise
Bibliography
Economic data
It's impossible to put a global figure on the cost of noise. All we can do is provide a few benchmarks for estimating the possible economic impact.
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Health
Estimates dating from 1978-1980 put the cost of noise-related problems at over 30 billion francs (around 4.5 billion euros):
11% of workplace accidents...
Regulations
Arrêté du 12 août 1975 Méthode de mesure des niveaux sonores en milieu de travail en vue de la protection de l'audition (JORF of October 12, 1975, page 10560)
Decree no. 63-405 of April 10, 1963 amending decree no. 46-2959 of December 31, 1946 (JORF of April 20, 1963, page 3693)
Decree no. 81-507 of May 4, 1981 revising and supplementing the tables of occupational diseases...
Standardization
- Évaluation de l'exposition au bruit en milieu professionnel et estimation du déficit auditif, induit par le bruit, de populations exposées (indice de classement : 31-013). - NF S31-013 - 04-85
- Acoustics – Determination of occupational noise exposure and estimation of noise-induced hearing damage. - ISO 1999:1990 - 01-90
- Acoustics – Environmental noise characterization and measurement – Application of standard...
Organizations
Center d'information et de documentation sur le bruit (CIDB) : http://www.bruit.fr
Service de Documentation de l'Institut national de recherche et de sécurité INRS : http://www.inrs.fr
International Occupational Safety and Health Information Centre...
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