ISO 11904-2:2021 Acoustics — Determination of sound immission from sound sources placed close to the ear —Part 2: Technique using a manikin

标准简介

Acoustics — Determination of sound immission from sound sources placed close to the ear —Part 2: Technique using a manikin由ISO于2021-03发布，适用于全球。

标准截图

 

标准文档说明

标准文档类型为Acoustics — Determination of sound immission from sound sources placed close to the ear —Part 2: Technique using a manikin高清PDF版本（文字版），标准文档内可进行搜索，可以复制原文，可粘贴。

标准部分原文

Acoustics — Determination of sound immission from sound sources placed close to the ear —

Part 2: Technique using a manikin

1 Scope

This document specifies basic framework measurement methods for sound immission from sound sources placed close to the ear. These measurements are carried out with a manikin, equipped with ear simulators including microphones. 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 manikin technique.

This document is applicable to exposure to sound from sources close to the ear, for example during equipment tests or at the workplace to sound from earphones or hearing protectors with audio communication facilities.

This document is applicable in the frequency range from 20 Hz to 10 kHz. For frequencies above 10 kHz, ISO 11904-1 can be used.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters

IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications

ITU-T P.58:2013, Head and torso simulator for telephonometry

3 Terms a nd definiti ons

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso. org/ obp

— IEC Electropedia: available at http:// www .electropedia .org/ 3.1

manikin sound pressure level

L

M,exp,f

equivalent continuous sound pressure level in one-third-octave frequency bands with nominal midband frequency f, measured with the microphone of an ear simulator integrated in a manikin when the manikin is exposed to the sound under test

3.2

f r e e -f ield f r e quenc y r e s p on s e f or u s e w it h m a n i k i n s

ΔL

FF,M,f

average human free-field frequency response for use with manikins, corrected for the difference between the sound transmission inside the average human ear canal and the corresponding transmission of the manikin ear simulator

Note 1 to entry: For applicability with manikins, the eardrum reference is replaced by the output of the manikin ear simulator in tabulated values of ΔL .

FF,M,f

Note 2 to entry: The free-field frequency response for use with manikins is identical to the amplitude of the head-

related transfer function (HRTF) for frontal sound incidence.

Note 3 to entry: The human free-field frequency response is defined in ISO 11904-1.

3.3

d i f f u s e -f ield f r e quenc y r e s p on s e f or u s e w it h m a n i k i n s

ΔL

DF,M,f

average human diffuse-field frequency response for use with manikins, corrected for the difference between the sound transmission inside the average human ear canal and the corresponding transmission of the manikin ear simulator

Note 1 to entry: For applicability with manikins, the eardrum reference is replaced by the output of the manikin ear simulator in tabulated values of ΔL .

DF,M,f

Note 2 to entry: The human diffuse-field frequency response is defined in ISO 11904-1.

3.4

f r e e -f ield r el at e d s ou nd pr e s s u r e level de t er m i ne d w it h a m a n i k i n

L

FF,M

free-field sound pressure level determined with the method using a manikin

Note 1 to entry: The definition may be applied to specific frequencies or frequency bands, weighted or unweighted levels, specific time weightings, etc., for instance “free-field related equivalent continuous A-weighted sound pressure level" (free-field related L , also denoted L ).

M,Aeq FF,M,Aeq

Note 2 to entry: The method is aimed at the mean free-field related sound pressure level that would be obtained with a large human population.

Note 3 to entry: The free-field related sound pressure level for a human subject is defined in ISO 11904-1.

3.5

d i f f u s e -f ield r el at e d s ou nd pr e s s u r e level de t er m i ne d w it h a m a n i k i n

L

DF,M

diffuse-field sound pressure level determined with the method using a manikin

Note 1 to entry: The definition may be applied to specific frequencies or frequency bands, weighted or unweighted levels, specific time weightings, etc., for instance “diffuse-field related equivalent continuous A-weighted sound pressure level" (diffuse-field related L , also denoted L ).

M,Aeq DF,M,Aeq

Note 2 to entry: The method is aimed at the mean diffuse-field related sound pressure level that would be obtained with a large human population.

Note 3 to entry: The diffuse-field related sound pressure level for a human subject is defined in ISO 11904-1.

4 Measurement principle

A manikin (head and torso simulator) is exposed to the sound source(s) in question and, for each of the ear simulators integrated in the manikin, the sound pressure level is measured in one-third-octave frequency bands, L .

M,exp,f

网盘链接

百度网盘：https://pan.baidu.com/s/1YIDGFz6ZEmZoFiQIChuMXg
提取码：7j8g