NF EN ISO 11904-1

NF EN ISO 11904-1

August 2003
Standard Current

Acoustics - Determination of sound immission from sound sources placed closed to the ear - Part 1 : technique using a microphone in a real ear (MIRE technique)

ISO 11904-1:2002 specifies basic framework measurement methods for sound immissions from sound sources placed close to the ear. These measurements are carried out with miniature or probe microphones inserted in the ear canals of human subjects. The measured values are subsequently converted into corresponding free-field or diffuse-field levels. The results can be given as free-field related or diffuse-field related equivalent continuous A-weighted sound pressure levels. The technique is denoted the microphone-in-real-ear technique (MIRE technique). ISO 11904-1:2002 is applicable to exposure from sources close to the ear, for example during equipment tests or at the workplace by earphones or hearing protectors with audio communication facilities. ISO 11904-1:2002 is applicable in the frequency range from 20 Hz to 16 000 Hz.

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Main informations

Collections

National standards and national normative documents

Publication date

August 2003

Number of pages

31 p.

Reference

NF EN ISO 11904-1

ICS Codes

17.140.01   Acoustic measurements and noise abatement in general

Classification index

S31-066-1

Print number

1 - 06/11/2003

International kinship

ISO 11904-1:2002

European kinship

EN ISO 11904-1:2002
Sumary
Acoustics - Determination of sound immission from sound sources placed closed to the ear - Part 1 : technique using a microphone in a real ear (MIRE technique)

ISO 11904-1:2002 specifies basic framework measurement methods for sound immissions from sound sources placed close to the ear. These measurements are carried out with miniature or probe microphones inserted in the ear canals of human subjects. The measured values are subsequently converted into corresponding free-field or diffuse-field levels. The results can be given as free-field related or diffuse-field related equivalent continuous A-weighted sound pressure levels. The technique is denoted the microphone-in-real-ear technique (MIRE technique).

ISO 11904-1:2002 is applicable to exposure from sources close to the ear, for example during equipment tests or at the workplace by earphones or hearing protectors with audio communication facilities.

ISO 11904-1:2002 is applicable in the frequency range from 20 Hz to 16 000 Hz.

Table of contents
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  • Avant-propos
    iv
  • Introduction
    v
  • Domaine d'application
  • 2
    Références normatives
  • 3
    Termes et définitions 2
  • 4
    Principe de mesurage 3
  • 5
    Appareillage 4
  • 5.1
    Microphone de conduit auditif 4
  • 5.2
    Microphone de référence 4
  • 5.3
    Vérification de l'étalonnage 4
  • 5.4 Filtres 4
  • 6
    Sujets 4
  • 7
    Utilisation du microphone de conduit auditif 4
  • 7.1
    Choix du point de mesure du conduit auditif 4
  • 7.2
    Fixation du microphone 5
  • 7.3
    Sécurité 5
  • 8
    Détermination du niveau de pression acoustique continu équivalent pondéré A relatif au champ libre ou au champ diffus 7
  • 8.1
    Mesurage du niveau de pression acoustique dans le conduit auditif 7
  • 8.2
    Conversion en niveau de pression acoustique relatif au champ libre ou au champ diffus 7
  • 8.3
    Pondération A et sommation 7
  • 9
    Réponses en fréquence en champ libre et en champ diffus pour les points de mesure du conduit auditif sélectionnés 8
  • 10
    Détermination des réponses en fréquence en champ libre ou en champ diffus 8
  • 10.1 Généralités 8
  • 10.2 Principe de mesurage
    8
  • 10.3 Établissement d'un champ acoustique de référence libre
    8
  • 10.4 Établissement d'un champ acoustique de référence quasi libre
    8
  • 10.5 Établissement d'un champ acoustique de référence diffus
    8
  • 10.6 Mesurage du champ acoustique de référence
    9
  • 10.7 Mesurage du niveau de pression acoustique dans le conduit auditif dans le champ acoustique de référence
    10
  • 10.8 Détermination de la réponse en fréquence du champ libre ou du champ diffus
    10
  • 10.9 Simplifications dans des cas particuliers
    10
  • 10.10 Vérification facultative du dispositif de mesure
    10
  • Rapport d'essai
    11
  • Annexe A (informative) Exemple de sources d'incertitude de mesure
    12
  • Annexe B (informative) Exemple d'analyse de l'incertitude 18
  • Bibliographie
    20
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