ISO INTERNATIONAL STANDARD 532-2 First edition 2017-06 Acoustics - Methods for calculating loudness Part 2: Moore-Glasberg method Acoustique - Méthode de calcul d'isosonie - Partie 2: Methode Moore-Glasberg Reference number ISO 532-2:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under itted without license from IHS IS0 532-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Intenationaibr Prganization for Standardization icensee-ZHEJIANG INST.OF STANDARDIZAoISQs.7 -All rights reserved Not for Resale, 2017/9/11 05:56:55 etworking permitted without license from IHS IS0 532-2:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions 4 General. ..5 5 Specifications of signals .5 5.1 General .5 5.2 Complex tone .5 5.3 Noise consisting of bands of pink or white noise of defined width ..5 5.4 Mixture of discrete sinusoidal components and bands of pink or white noise. 5.5 Sound specified in terms of the sound pressure levels in 29 adjacent one-third- octavebands ..6 6 Instrumentation. ..6 7 Description of the method 7.1 Introduction 1 7.2 Determination of sound spectrum at the tympanic membrane ..7 7.2.1 General 7 7.2.2 Free field and diffuse field transfer functions for sound picked up by a .8 single microphone 7.2.3 Earphones. ..8 7.2.4 Signal recorded at eardrum .8 7.2.5 Head and torso simulator .8 7.2.6 Interpolation and extrapolation. ..8 7.3 Determination of sound spectrum at the oval window .9 7.4 Transformation of sound spectrum into excitation pattern .10 7.5 Transformation of excitation pattern into specific loudness ..13 7.5.1 Introduction ..13 7.5.2 Reference excitation at the reference threshold of hearing. .14 7.5.3 Gain ofthe cochlear amplifierforinputs with low soundpressurelevels ..14 7.5.4 Calculation of specific loudness from excitation when ETHRQ/Eo ≤ E/Eo . 15 7.5.5 Calculation of specific loudness from excitation when ETHRQ/Eo > E/Eo. 15 7.5.6 Calculation of specific loudness from excitation when E > 1010. 8 Calculation of loudness and loudness level. .16 8.1 Calculation of monaural and binaural loudness (diotic and dichotic stimuli) .16 8.2 Relationship between loudness level and loudness. ..17 8.3 Calculation of the reference threshold of hearing. ..18 9 Uncertainty of calculated loudness for stationary sounds ..18 10 Data reporting .19 Annex A (informative) Comments regarding binaural loudness ..20 Annex B (informative) Results for specific test signals ..21 Annex C (informative) Software for the calculation of loudness ..26 Bibliography ..27 iii e=ZHEJIANG INST OF STANDARDIZATION C1 5956617