BSI PD IEC/TS 60318-7:2017
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Electroacoustics. Simulators of human head and ear – Head and torso simulator for the measurement of air-conduction hearing aids
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 36 |
IEC TS 60318-7:2017(E) describes a head and torso simulator, or manikin, intended for the measurement of air-conduction hearing aids in the frequency range from 100 Hz to 16 000 Hz. The manikin described in this document is intended for airborne acoustic measurements only. It is not suitable for measurements which depend upon vibration transmission paths such as bone conduction, or for measurements requiring the simulation of bone or tissue. This document specifies the manikin in terms of both its geometrical dimensions and its acoustical properties. Only manikins compliant with both sets of specifications are in conformance with this document. This edition includes the following significant technical changes with respect to the previous edition: a) the document is based on the designs of three different commonly used types of manikins; b) the cross sections of the head and torso and pinna simulators of the previous edition are replaced by maximum and minimum values of their geometric dimensions; c) the diffuse field frequency response of the manikin is added; d) the usable frequency range is extended to 100 Hz to 16 000 Hz; e) in addition to the cylindrical ear canal extension a tapered ear canal extension is added; f) design examples of one anatomically shaped manikin and of two different geometrically shaped manikins are given in the annexes; g) the relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement are given in an annex; h) 3D representations of three different types of pinna simulators are given in an annex.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions |
| 12 | Figures Figure 1 – Manikin geometrical references |
| 13 | 4 Construction 4.1 General Figure 2 – Coordinate scheme for azimuth and elevation angles |
| 14 | 4.2 Geometrical dimensions of the manikin 4.2.1 Head and torso Figure 3 – Illustration of manikin head and torso dimensions |
| 15 | 4.2.2 Pinna simulators for hearing aid measurements Tables Table 1 – Manikin head and torso dimensions |
| 16 | 4.2.3 Ear canal extension |
| 17 | Figure 4 – Illustration of manikin pinna simulator dimensions |
| 18 | 4.2.4 Ear simulator Table 2 – Dimensions of the pinna simulator and the cylindrical ear canal extension of the manikin Table 3 – Dimensions of the pinna simulator and the tapered ear canal extension of the manikin |
| 19 | 4.2.5 Materials 4.3 Acoustical characteristics of the manikin 4.3.1 Free-field frequency response |
| 20 | Table 4 – Free-field frequency response of the manikin for an azimuth angle of 0° (right ear) |
| 21 | 4.3.2 Diffuse-field frequency response Table 5 – Free-field frequency responses of the manikin for azimuth angles of 90°, 180° and 270° (right ear) |
| 22 | 4.3.3 Acceptance intervals 4.3.4 Openings Table 6 – Diffuse-field frequency response of the manikin (right ear) |
| 23 | 5 Calibration 5.1 Reference environmental conditions 5.2 Calibration method 5.2.1 General 5.2.2 Test signal, test space and measurement equipment |
| 24 | 5.2.3 Measurement of sound pressure level |
| 25 | 5.2.4 Alignment of manikin azimuth and elevation 5.2.5 Test for sound leakage 6 Marking and instruction manual 6.1 Markings of the manikin 6.2 Instruction manual |
| 26 | 7 Maximum permitted uncertainty of measurements |
| 27 | Table 7 – Maximum permitted uncertainty Umax for type approval measurements |
| 28 | Annex A (informative)Design example of an anatomically shaped manikin Figure A.1 – Example of an anatomically shaped manikin |
| 29 | Annex B (informative)Design examples of a geometrically shaped manikin Figure B.1 – Example 1 of a geometrically shaped manikin |
| 30 | Figure B.2 – Example 2 of a geometrically shaped manikin |
| 31 | Annex C (informative)Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement Figure C.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement |
| 32 | Annex D (informative)3D representation of example pinna simulators D.1 Background D.2 Scanning technique D.3 Examples of pinna simulator shape |
| 33 | D.4 Verification of conformance Figure D.1 – (Embedded 3D PDFs) – Examples of a pinna simulator |
| 34 | Bibliography |
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