ISO INTERNATIONAL STANDARD 21727 Secondedition 2016-05-01 Cinematography Method of measurement of perceived loudness of short duration motion-picture audio material Cinématographie-Methode demesure de I'intensité sonore percue pour les films cinématographiques de courte durée Reference number IS0 21727:2016(E) ISO International Organization for Standardization @ IS0 2016 ZHEJIANG INSTOFSTANDARDIZATION C15956617 Not for Resale, 2016/7/20 08:15:04 ed without license from IHS IS0 21727:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, 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 +41 22 749 09 47 [email protected] www.iso.org Internatinair PrganizationforStandardization nsee-ZHEJIANG INSTOF STANDARDIZAoSQ6- All rights reserved etworking permitted without license from IHS IS0 21727:2016(E) Contents Page Foreword ..iv Introduction. .. 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Method of measurement .3 4.1 General .3 4.2 Procedure .3 4.2.1 Input calibration and M-type frequency weighting .3 4.2.2 Scalar channel summation ..3 4.2.3 Loudness-equivalent level. 3 4.2.4 Calculation 4 Annex A (informative) Typical recording and replay levels ..5 Bibliography 6 iii e=ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS under withoutlicense from IHS