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BS EN IEC 60118-16:2022

BS EN IEC 60118-16:2022

$167.15

Electroacoustics. Hearing aids – Definition and verification of hearing aid features

Published By Publication Date Number of Pages
BSI 2022 36
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This part of IEC 60118 gives definitions for common hearing aid features such as noise reduction or feedback reduction, etc. Only acoustical inputs are considered. Binaural features are currently not covered in this document. In addition, measurement procedures are described to verify hearing aid features. The objective is not to evaluate the performance of features but to verify their existence and functionality. Furthermore, definitions and procedures are kept as general as possible so that this document can be applied to various types of hearing aids, e.g. air conduction hearing aids or bone conduction hearing aids. To this end, the general definition for hearing aid of IEC 60118-0:2015 is adopted, and this document does not refer to any specific ear simulator or acoustic coupler but uses a general definition of a coupler. However, if a general view is not applicable or leads to unclear or complex wording, the situation for an air conduction hearing aid is considered, only. Nevertheless, in Clause 4, an explanation is given on how this document can be applied to hearing aids which do not use air conduction.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 1 Scope
2 Normative references
3 Terms and definitions
15 4 Application to non-air-conduction hearing aids
5 Test equipment
5.1 Acoustical requirements
16 5.2 Examples of test signals for common listening situations
6 Verification of noise reduction
6.1 Noise reduction for speech enhancement
Tables
Table 1 ā€“ Examples of test signals for different listening situations
17 6.2 Gain reduction for noise
18 7 Strategies of hearing aid programs and their verification
7.1 General
7.2 User-selected hearing aid programs
7.2.1 Description
7.2.2 Verification
Figures
Figure 1 ā€“ Visualization of user selected HAPs
19 7.3 Automatically-selected hearing aid programs depending on listening situation
7.3.1 Description
Figure 2 ā€“ Visualization of automatically-selected HAPsdepending on listening situation
20 7.3.2 Verification by setting a marker
7.3.3 Verification using a linear gain configuration
21 8 Verification of feedback reduction
8.1 General
8.2 Coupling of the hearing aid
8.3 Measurement procedure
22 8.4 Post processing
Table 2 ā€“ Symbols used for the evaluation and resultsof the feedback reduction measurement
23 9 Verification of the number of hearing aid channels
9.1 Visualization of the effect of multichannel signal processing
Figure 3 ā€“ Example of the plot of the results of the feedback reduction measurement
24 9.2 Evaluation of the number of independent channels
Table 3 ā€“ Example results of the procedure for the verificationof multichannel signal processing
25 10 Verification of an output limiter
26 Annex A (informative)Coupling of the hearing aid to the measurement couplerin order to provoke feedback
A.1 Simplified coupling of air-conduction hearing aids to the 2 cm3 acoustic coupler
Figure A.1 ā€“ Simplified coupling of air-conduction hearing aids with one microphone to the 2 cm3 acoustic coupler to provoke feedback
27 A.2 Head and torso simulator with vented ear canal extension
Figure A.2 ā€“ Simplified coupling of air-conduction hearing aids with two microphones to the 2 cm3 acoustic coupler to provoke feedback
Figure A.3 ā€“ Head and torso simulator for the measurement of air-conduction hearing aids according to IEC/TS 60318-7 together with an ear simulator according to IEC 60318-4 and a vented ear canal extension
28 Figure A.4 ā€“ Example for a vented ear canal extension withmedium flow (left) and high flow (right)
29 Annex B (informative)Particular guidance
B.1 Verification of user selected hearing aid programs
Figure B.1 ā€“ Visualization of the verification of user-selected hearing aid programs
Table B.1 ā€“ Example results for the verification of user selected hearing aid programs
30 B.2 Automatically-selected hearing aid programs depending on listening situation
B.2.1 Verification by setting a marker
Figure B.2 ā€“ Visualization of the measurement of the reference data for the verification of automatically-selected hearing aid programs by setting a marker
31 Figure B.3 ā€“ Visualization of the measurement for the verification of automaticallyselected hearing aid programs by setting a markerwhere a marker is set to the hearing aid program 1
32 B.2.2 Verification by using a linear gain configuration
Table B.2 ā€“ Example results for the verification of automatically-selectedhearing aid programs by setting a marker
Table B.3 ā€“ Example for the evaluation of the results for the verification of automatically-selected hearing aid programs by setting a marker
33 Figure B.4 ā€“ Visualization of the measurement for the verification of automaticallyselected hearing aid programs by using a linear gain configuration
34 Bibliography

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BS EN IEC 60118-16:2022
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