DD IEC/TS 60318-7:2011
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Electroacoustics. Simulators of human head and ear Head and torso simulator for the measurement of hearing aids
Hardcopy , PDF
31-12-2017
English
31-05-2011
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FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Construction
5 Calibration
6 Maximum permitted expanded uncertainty of measurements
Annex A (informative) - Ear canal sound pressure ratio
Bibliography
Specifies a head and torso simulator (manikin) intended for the measurement of air-conduction hearing aids in the frequency range from 100 Hz to 10000 Hz.
| Committee |
EPL/29
|
| DocumentType |
Standard
|
| Pages |
40
|
| PublisherName |
British Standards Institution
|
| RevisionOf | |
| Status |
Superseded
|
| SupersededBy |
This part of IEC 60318 describes a head and torso simulator (manikin) intended for the measurement of air-conduction hearing aids in the frequency range from 100 Hz to 10 000 Hz. The device consists of a head mounted on a torso that extends to the waist. The head is equipped with simulated pinnae and with cylindrical cavities having acoustic impedance terminations and microphones located at positions corresponding to those of the eardrums in a median human adult. It has been designed to provide acoustic diffraction similar to that encountered around the median human head and torso.
The device with its present pinna simulator, however, is not suitable for the measurement of all types of hearing aids. For example, most in-the-ear (ITE) and completely-in-the-canal (CIC) hearing aids cannot be measured correctly.
The manikin is specified in terms of both, its geometrical dimensions and its acoustical properties.
NOTE 1 Measurement results obtained with a manikin may differ substantially from similar results obtained on an individual person, due to anatomical variations.
NOTE 2 The median values of the human head and torso were drawn from the population samples described in [5]1.
NOTE 3 It is acknowledged that devices conforming to this part of IEC 60318 are also used as the basis for applications extending beyond this Scope. In such cases it is recommended that any design variations that are necessary are documented, and that a statistical analysis of the measurement data be carried out to determine the level of repeatability that can be achieved. It will also be necessary to consider the relevance of the measurements made with the head and torso simulator to the application in question.
| Standards | Relationship |
| IEC TS 60318-7:2017 | Identical |
| IEC 60318-4:2010 | Electroacoustics - Simulators of human head and ear - Part 4: Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts |
| 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 |
| IEC 60118-8:2005 | Electroacoustics - Hearing aids - Part 8: Methods of measurement of performance characteristics of hearing aids under simulated [<i>in situ</i>] working conditions |
| ISO/IEC Guide 98-3:2008 | Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) |
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