ILO Home
Go to the home page
Site map | Contact us Français | Español

CISDOC database

Document ID (ISN)102688
CIS number 03-1877
Year 2004
Convention or series no. NTP 638
Author(s) Luna Mendaza P., Guasch Farrás J.
Title Estimation of the effective attenuation of hearing protectors
Original title Estimación de la atenuación efectiva de los protectores auditivos [in Spanish]
Bibliographic information Instituto Nacional de Seguridad e Higiene en el Trabajo, Ediciones y Publicaciones, c/Torrelaguna 73, 28027 Madrid, Spain, 2004. 5p. Illus. 2 ref.
Internet access [in Spanish]
Abstract Hearing protectors need to comply with certain requirements concerning noise attenuation. Noise attenuation is constant for each octave band, but the overall attenuation differs according to the noise frequency spectra. This information note describes the methods used for calculating the various noise attenuation indices that allow the determination of the effective residual noise load at the ear. Contents: definition of the various noise level attenuation parameters; octave band method; H, M and L method; SNR (Single Number Rating) method; example simulating the exposure of a worker as a function of time and use of hearing protectors.
Descriptors (primary) hearing protection; sound attenuation; Spain
Descriptors (secondary) data sheet; noise level
Document type F - Information notes, codes of practice, standards
Country / State or ProvinceSpain
Subject(s) Noise, hearing and vibration
Broad subject area(s) Physical hazards
Browse category(ies) Noise
Hearing protection