ISO INTERNATIONAL STANDARD 532-1 First edition 2017-06 Acoustics - Methods for calculating loudness Part 1: Zwicker method Acoustique - Méthode de calcul du niveau d'isosonie - Partie 1: Méthode de Zwicker Reference number ISO 532-1:2017(E) os1 International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under Not for Resale, 2017/9/12 02:56:43 itted without license from IHS IS0 532-1:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 [email protected] www.iso.org Intenatinir PrganizationforStandardization ensee-ZHEJIANG INSTOF STANDARDIzARoISQa7 - All rights reserved I by IHS unde Not for Resale, 2017/9/12 02:56:43 etworking permitted without license from IHS IS0 532-1:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions ..1 4 Specification of input signal and instrumentation ..4 5 Method for stationary sounds .5 5.1 General .5 5.2 Description of the method .6 5.3 Calculation of loudness and loudness level .9 6 Method for time-varying sounds .12 6.1 General 12 6.2 Description of the method .13 6.3 Calculation algorithm. .14 6.4 Guidance for determining the loudness of time-varying sounds ..15 7 Reporting data .16 Annex A (normative) Numerical details and program code for the calculation of loudness of stationaryandtime-varyingsounds(testimplementation) 17 AnnexB (normative) Test signals forthe validation of implementation ..45 Annex C (informative) Graphical user interface for the calculation of loudness of stationary and time-varying sounds .48 Annex D (informative) Guidance for determining the loudness when using head and torso simulator microphones... .53 Annex E (informative) Uncertainty considerations. ..54 Bibliography .57 iii thout license from IHS