EN ISO 3382-2:2008
(Main)Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms (ISO 3382-2:2008)
Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms (ISO 3382-2:2008)
ISO 3382-2:2008 specifies methods for the measurement of reverberation time in ordinary rooms. It describes the measurement procedure, the apparatus needed, the required number of measurement positions, and the method for evaluating the data and presenting the test report.
The measurement results can be used for correction of other acoustic measurements, e.g. sound pressure level from sound sources or measurements of sound insulation, and for comparison with requirements for reverberation time in rooms.
Akustik - Messung von Parametern der Raumakustik - Teil 2: Nachhallzeit in gewöhnlichen Räumen (ISO 3382-2:2008)
Dieser Teil von ISO 3382 legt Verfahren zur Messung der Nachhallzeit in Räumen fest. Sie legt das Messverfahren, die benötigten Geräte, die erforderliche Anzahl der Messpunkte und das Verfahren zur Auswertung der Daten und zur Abfassung des Prüfberichts fest.
Die Messergebnisse können für die Korrektur weiterer akustischer Messungen angewendet werden, z. B. die Bestimmung des Schalldruckpegels von Schallquellen oder Messungen der Schalldämmung und für den Vergleich mit den Anforderungen an die Nachhallzeit in Räumen.
Acoustique - Mesurage des paramètres acoustiques des salles - Partie 2: Durée de réverbération des salles ordinaires (ISO 3382-2:2008)
L'ISO 3382-2:2008 spécifie des méthodes de mesurage de la durée de réverbération des salles. Elle décrit le mode opératoire de mesurage, l'équipement nécessaire, le nombre requis de positions de mesurage et la méthode d'évaluation des données et de présentation du rapport d'essai.
Les résultats du mesurage peuvent être utilisés pour corriger d'autres mesurages acoustiques (le niveau de pression acoustique provenant de sources sonores ou les mesurages de l'isolement acoustique, par exemple) et pour la comparaison avec les exigences en matière de durée de réverbération des salles.
Akustika - Merjenje parametrov prostorske akustike - 2. del: Odmevni čas v običajnih prostorih (ISO 3382-2:2008)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Messung von Parametern der Raumakustik - Teil 2: Nachhallzeit in gewöhnlichen Räumen (ISO 3382-2:2008)Acoustique - Mesurage des parametres acoustiques des salles - Partie 2: Durée de réverbération des salles ordinaires (ISO 3382-2:2008)Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms (ISO 3382-2:2008)91.120.20L]RODFLMDAcoustics in building. Sound insulation17.140.01Acoustic measurements and noise abatement in generalICS:Ta slovenski standard je istoveten z:EN ISO 3382-2:2008SIST EN ISO 3382-2:2008en01-november-2008SIST EN ISO 3382-2:2008SLOVENSKI
STANDARDSIST EN ISO 3382:20011DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 3382-2June 2008ICS 91.120.20Supersedes EN ISO 3382:2000
English VersionAcoustics - Measurement of room acoustic parameters - Part 2:Reverberation time in ordinary rooms (ISO 3382-2:2008)Acoustique - Mesurage des paramètres acoustiques dessalles - Partie 2: Durée de réverbération des sallesordinaires (ISO 3382-2:2008)Akustik - Messung von Parametern der Raumakustik - Teil2: Nachhallzeit in gewöhnlichen Räumen (ISO 3382-2:2008)This European Standard was approved by CEN on 22 May 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 3382-2:2008: ESIST EN ISO 3382-2:2008
Reference numberISO 3382-2:2008(E)© ISO 2008
INTERNATIONAL STANDARD ISO3382-2First edition2008-06-15Acoustics — Measurement of room acoustic parameters — Part 2: Reverberation time in ordinary rooms Acoustique — Mesurage des paramètres acoustiques des salles —
Partie 2: Durée de réverbération des salles ordinaires
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ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel.
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ii © ISO 2008 – All rights reserved
ISO 3382-2:2008(E) © ISO 2008 – All rights reserved iiiContents Page Foreword.iv Introduction.v 1 Scope.1 2 Normative references.1 3 Terms and definitions.1 4 Measurement conditions.2 4.1 General.2 4.2 Equipment.3 4.3 Measurement positions.4 5 Measurement procedures.5 5.1 General.5 5.2 Interrupted noise method.5 5.3 Integrated impulse response method.6 6 Evaluation of decay curves.7 7 Measurement uncertainty.7 7.1 Interrupted noise method.7 7.2 Integrated impulse response method.8 7.3 Lower limits for reliable results caused by filter and detector.8 8 Spatial averaging.8 9 Statement of results.9 9.1 Tables and curves.9 9.2 Test report.9 Annex A (informative)
Measurement uncertainty.10 Annex B (informative)
Evaluation of non-linear decay curves.14 Annex C (informative)
Formulas for the least-squares fit method.16 Bibliography.17
ISO 3382-2:2008(E) iv © ISO 2008 – All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and 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/IEC 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: ⎯ Part 1: Performance rooms ⎯ Part 2: Reverberation time in ordinary rooms The following part is in preparation: ⎯ Part 3: Open plan spaces SIST EN ISO 3382-2:2008
ISO 3382-2:2008(E) © ISO 2008 – All rights reserved vIntroduction This part of ISO 3382 specifies three levels of measurement accuracy: survey; engineering; and precision. The main difference concerns the number of measurement positions and thus the time required for the measurements. Annex A contains some additional information about the measurement uncertainty of the reverberation time. The introduction of the option of a survey measurement is intended to promote more frequent measurement of reverberation time in rooms where it is relevant. It is obvious that a very simple measurement is better than no measurement. There are several reasons to measure reverberation time. First, the sound pressure level from noise sources, the intelligibility of speech, and the perception of privacy in a room are strongly dependent on reverberation time. Rooms may include domestic rooms, stairways, workshops, industrial plants, classrooms, offices, restaurants, exhibition centres, sports halls, and railway and airport terminals. Second, reverberation time is measured to determine the correction term for room absorption inherent in many acoustic measurements, such as sound insulation measurements according to ISO 140 (all parts) and sound power measurements according to ISO 3740. In some countries, building codes specify the required reverberation times in classrooms and other categories of room. However, in the vast majority of rooms, it is left to the design team to specify and design for a reverberation time that is reasonable for the purpose of a room. This part of ISO 3382 is intended to contribute to the general understanding and acceptance of reverberation time for room quality and usability. Two different evaluation ranges are defined in this part of ISO 3382, 20 dB and 30 dB. However, a preference has been given to the 20 dB evaluation range for several reasons: a) the subjective evaluation of reverberation is related to the early part of the decay; b) for the estimation of the steady-state sound level in a room from its reverberation time, it is appropriate to use the early part of the decay: and c) the signal-to-noise ratio is often a problem in field measurements, and it is often difficult or impossible to get a evaluation range of more than 20 dB. This requires a signal-to-noise level of at least 35 dB. The traditional measuring technique is based on visual inspection of every single decay curve. With modern measuring equipment, the decay curves are normally not displayed and this may introduce a risk that abnormal decay curves are used for the determination of the reverberation time. For this reason, Annex B introduces two new measures that quantify the degree of non-linearity and the degree of curvature of the decay curve. These measures may be used to give warnings when the decay curve is not linear, and consequently the result should be marked as less reliable and not having a unique reverberation. The use of rotating microphones during the measurement of decay curves has been considered by the working group, and this procedure is found to be without a clear physical meanin
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