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BS EN ISO 11904-1:2002

BS EN ISO 11904-1:2002

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Acoustics. Determination of sound immission from sound sources placed close to the ear. Technique using a microphone in a real ear (MIRE technique)

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

12-06-2002

Publisher

British Standards Institution

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement principle
5 Instrumentation
   5.1 Ear canal microphone
   5.2 Reference field microphone
   5.3 Check of calibration
   5.4 Filters
6 Subjects
7 Use of ear canal microphone
   7.1 Choice of ear canal measurement position
   7.2 Mounting of microphones
   7.3 Safety
8 Determination of free-field or diffuse-field
   related equivalent continuous A-weighted sound
   pressure level
   8.1 Measurement of ear canal sound pressure level
   8.2 Conversion to free-field or diffuse-field related
         sound pressure level
   8.3 A-weighting and summation
9 Free-field and diffuse-field frequency responses for
   selected ear canal measurement positions
10 Determination of free-field or diffuse-field frequency
   responses
   10.1 General
   10.2 Measurement principle
   10.3 Establishment of a free reference sound field
   10.4 Establishment of a quasi-free reference sound
         field
   10.5 Establishment of a diffuse reference sound field
   10.6 Measurement of the reference sound field
   10.7 Measurement of ear canal sound pressure level in
         reference sound field
   10.8 Determination of free-field or diffuse-field
         frequency response
   10.9 Simplifications in specific cases
   10.10 Optional check of the measurement arrangement
11 Test report
Annex A (informative) Example of sources of measurement
        uncertainty
Annex B (informative) Example of an uncertainty analysis
Bibliography

Gives basic framework measurement methods for sound immission 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.

This part of ISO 11904 specifies basic framework measurement methods for sound immission 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 are 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).

This part of ISO 11904 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.

This part of ISO 11904 is applicable in the frequency range from 20 Hz to 16 000 Hz.

Committee
EH/1/1
DevelopmentNote
Supersedes 00/561593 DC (11/2002)
DocumentType
Standard
Pages
32
PublisherName
British Standards Institution
Status
Current
Supersedes

BS 8469:2007 Personal protective equipment for firefighters. Assessment of ergonomic performance and compatibility. Requirements and test methods
PD 6545:2005 Intended use of human head and ear simulators-guide

IEC 60601-1:2005+AMD1:2012 CSV Medical electrical equipment - Part 1: General requirements for basic safety and essential performance
IEC 60942:2003 Electroacoustics - Sound calibrators
IEC 61094-1:2000 Measurement microphones - Part 1: Specifications for laboratory standard microphones
ISO 11904-2:2004 Acoustics Determination of sound immission from sound sources placed close to the ear Part 2: Technique using a manikin
IEC 60268-7:2010 Sound system equipment - Part 7: Headphones and earphones
EN 50332-1:2013 Sound system equipment: Headphones and earphones associated with personal music players - Maximum sound pressure level measurement methodology - Part 1: General method for "one package equipment"
IEC 60268-1:1985 Sound system equipment. Part 1: General
IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
ISO 8253-2:2009 Acoustics Audiometric test methods Part 2: Sound field audiometry with pure-tone and narrow-band test signals

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