BS EN 61669:2016
$167.15
Electroacoustics. Measurement of real-ear acoustical performance characteristics of hearing aids
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 42 |
IEC 61669:2015 gives recommendations and requirements for the measurement and estimation of the real-ear acoustical performance characteristics of air-conduction hearing aids and for the measurement of certain acoustic properties of the ear related to the application of hearing aids. Measurements of real-ear acoustical characteristics of hearing aids which apply non-linear or analytical processing techniques are valid only for the test signals used and conditions employed. The purpose of this standard is to ensure that measurements of real-ear acoustical performance characteristics of a given hearing aid on a given human ear can be replicated in other locations with other test equipment. This second edition cancels and replaces the first edition of IEC 61669:2001 and the first edition of ISO 12124:2001. This edition constitutes a technical revision.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | European foreword Endorsement notice |
| 6 | English CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references |
| 12 | 3 Terms and definitions |
| 17 | 4 Test setup diagrams |
| 18 | Figures Figure 1 – Test set-up |
| 19 | 5 Limitations Figure 2 – Real-ear measurement arrangement |
| 20 | 6 Test equipment 6.1 Safety requirements 6.2 Ambient conditions 6.3 Test signal |
| 21 | 6.4 Sound field source 6.5 Coupled sound source 6.6 Test signal range 6.7 Test signal level indication 6.8 Equalization 6.9 Frequency 6.10 Harmonic distortion 6.11 Probe microphone measurement 6.12 Noise floor of probe microphone measurement |
| 22 | 6.13 Attenuation of probe microphone to external signals 6.14 Analysis characteristics 6.15 Output indication 6.16 Graphical printout |
| 23 | 7 Test conditions 7.1 Ambient conditions in the test space 7.2 Background noise 7.3 Acoustical properties 7.4 Sound field characteristics 7.5 Calibration 7.6 Equalization 7.6.1 General 7.6.2 Substitution method |
| 24 | 7.6.3 Modified pressure method – Stored equalization 7.6.4 Modified pressure method – Concurrent equalization 7.7 Test signal level 7.8 Location of the subject 7.9 Location of the tester 7.10 Location of the field reference point |
| 25 | 7.11 Location of the measurement point 7.12 Instructions to the subject 7.13 Location and coupling of the hearing aid 7.14 Operating conditions for the hearing aid 8 Measurements 8.1 General 8.2 Real-ear unaided response (REUR) curve |
| 26 | 8.3 Real-ear unaided gain (REUG) curve 8.4 Real-ear occluded response (REOR) curve 8.5 Real-ear occluded gain (REOG) curve 8.6 Real-ear aided response (REAR) curve |
| 27 | 8.7 Real-ear aided gain (REAG) curve 8.8 Real-ear insertion gain (REIG) curve 8.9 Real-ear to coupler difference (RECD) curve 8.10 Real-ear to dial difference (REDD) curve |
| 28 | 9 Measurement uncertainty for the performance requirements of Clause 6 Tables Table 1 – Tolerance limits, acceptance limits and Umax for basic measurements |
| 29 | Annex A (informative) Positioning the probe microphone sound inlet at the measurement point A.1 General A.2 Visual positioning A.3 Acoustically-assisted positioning |
| 30 | A.4 Acoustic positioning – Method 1 A.5 Acoustic positioning – Method 2 A.6 Geometrical positioning |
| 31 | Annex B (informative) Issues in RECD measurement and application B.1 General B.2 Influence of the coupled sound source |
| 33 | Figure B.1 – Computer-simulated ECLD for an average adult ear Figure B.2 – Computer-simulated ECLD for an average 3-month old child’s ear |
| 34 | B.3 Estimating ear canal SPL produced by a hearing aid |
| 35 | Figure B.3 – Computer-simulated error in estimating SPL in an average adult ear Figure B.4 – Computer-simulated error in estimating SPL in an average 3-month old child’s ear |
| 36 | B.4 Correcting an HL audiogram obtained with an insert earphone and a standard eartip B.5 Correcting an HL audiogram obtained with an insert earphone and a custom earmould |
| 37 | Figure B.5 – Computer-simulated HL correction for an average 3 month old child’s ear |
| 38 | 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 |
| 39 | Bibliography |
