Table of Contents

FOREWORD<br>INTRODUCTION<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Limitations<br>5 Test equipment<br>&nbsp;&nbsp;5.1 Acoustical requirements for the test space<br>&nbsp;&nbsp;5.2 Sound source<br>&nbsp;&nbsp;5.3 Manikin<br>&nbsp;&nbsp;5.4 Ear simulator<br>&nbsp;&nbsp;5.5 Ear insert simulator<br>&nbsp;&nbsp;5.6 Equipment for the measurement of occluded-ear <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;simulator sound pressure level<br>&nbsp;&nbsp;5.7 Equipment for automatic sweep frequency recording<br>&nbsp;&nbsp;5.8 Equipment for calibration of free field sound <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pressure level<br>6 Test conditions<br>&nbsp;&nbsp;6.1 Choice of test point<br>&nbsp;&nbsp;6.2 Ambient conditions<br>&nbsp;&nbsp;6.3 Manikin<br>&nbsp;&nbsp;6.4 Location of the hearing aid<br>&nbsp;&nbsp;6.5 Normal operating conditions for the hearing aid<br>7 Measurements<br>&nbsp;&nbsp;7.1 General<br>&nbsp;&nbsp;7.2 Adjustment of the reference input sound pressure <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;level <br>&nbsp;&nbsp;7.3 Manikin frequency response (MFR)<br>&nbsp;&nbsp;7.4 Full-on simulated insertion gain measured by the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;constant reference input SPL method<br>&nbsp;&nbsp;7.5 Full-on simulated insertion gain measured by the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;constant ear simulator SPL method<br>&nbsp;&nbsp;7.6 Directional characteristics<br>&nbsp;&nbsp;7.7 Simulated in situ OSPL90 measurements<br>&nbsp;&nbsp;7.8 Simplified method to measure simulated in situ and <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;insertion gain response<br>8 Frequency response recording charts<br>9 Maximum permitted expanded uncertainty of measurements<br>Annex A (normative) Free-field to hearing-aid-microphone <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;transformation<br>Annex B (normative) Manikin unoccluded-ear gain (open ear <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response)<br>Annex C (informative) General requirements for a manikin<br>Bibliography

Abstract

Specifies the methods for a test which simulates the acoustical effects of a median adult wearer on the performance of a hearing aid.

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Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 29