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BS ISO 26101-1:2021 – TC

BS ISO 26101-1:2021 – TC

$186.33

Tracked Changes. Acoustics. Test methods for the qualification of the acoustic environment – Qualification of free-field environments

Published By Publication Date Number of Pages
BSI 2021 62
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This document specifies methodology for qualifying acoustic spaces as anechoic and hemi-anechoic spaces meeting the requirements of a free sound field.

This document specifies discrete-frequency and broad-band test methods for quantifying the performance of anechoic and hemi-anechoic spaces, defines the qualification procedure for an omni-directional sound source suitable for free-field qualification, gives details of how to present the results and describes uncertainties of measurement.

This document has been developed for qualifying anechoic and hemi-anechoic spaces for a variety of acoustical measurement purposes. It is expected that, over time, various standards and test codes will refer to this document in order to qualify an anechoic or hemi-anechoic space for a particular measurement. Annex D provides guidelines for the specification of test parameters and qualification criteria for referencing documents.

In the absence of specific requirements or criteria, Annex A provides qualification criteria and measurement requirements to qualify anechoic and hemi-anechoic spaces for general purpose acoustical measurements.

This document describes the divergence loss method for measuring the free sound field performance of an acoustic environment.

PDF Catalog

PDF Pages PDF Title
32 National foreword
36 Foreword
37 Introduction
39 1 Scope
2 Normative references
3 Terms and definitions
40 4 Allowable deviations from inverse square law
41 5 Measurement of free sound field performance
5.1 Divergence loss method
5.1.1 Principle
5.1.2 Instrumentation and measuring equipment
42 5.1.3 Location of test sound sources and microphone traverses
43 5.1.4 Test procedure
44 5.1.5 Expression of results
45 5.1.6 Measurement uncertainty
5.2 Information to be recorded
46 5.3 Information to be reported
47 Annex A (normative) Qualification criteria and measurement requirements
50 Annex B (normative) General procedure for evaluation of test sound source directionality
53 Annex C (informative) Measurement uncertainty
56 Annex D (informative) Guidelines for referring to this test method
58 Bibliography

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BS ISO 26101-1:2021 - TC
$186.33