ISO INTERNATIONAL STANDARD 3382-2 First edition 2008-06-15 Acoustics Measurement of room acoustic parameters Part 2: Reverberation time in ordinary rooms Acoustique Mesurage des parametres acoustiques des salles Partie 2: Durée de reverbération des salles ordinaires Reference number ISO 3382-2:2008(E) @ISO 2008 ISO 3382-2:2008(E) Contents Page Foreword iv Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Measurement condition 4.1 General, 4.2 Equipment 4.3 Measurement positions 5 Measurement procedures .... 5.1 General. 5.2 Interrupted noise method 5.3 Integrated impulse response method 6 Evaluation of decay curves Measurement uncertainty.. 7.1 Interrupted noise method ... 7.2 Integrated impulse response method.. 7.3 Lower limits for reliable results caused by filter and detector ... 8 Spatial averaging . 6 Statement of results ... 9.1 Tables and curves. 9.2 Test report. AnnexA(informative)Measurementuncertainty 10 Annex B (informative) Evaluation of non-linear decay curves 14 Annex C (informative) Formulas for the least-squares fit method. 16 Bibliography @Is02008-All rights reserved ii ISO 3382-2:2008(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeer non-governmental, in liaison with isO, also take part in the work. iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 3382-2 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics. ISO 3382-2, together with ISO 3382-1 and IsO 3382-3, cancel and replace ISO 3382:1997 ISO 3382 consists of the following parts, under the general title Acoustics — Measurement of room acoustic parameters: Part1:Performancerooms Part 2: Reverberation time in ordinary rooms The following part is in preparation: Part 3: Open plan spaces ISo 2008 - All rights reserved