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BS EN ISO 10534-2:2023 – TC

BS EN ISO 10534-2:2023 – TC

$217.84

Tracked Changes. Acoustics. Determination of acoustic properties in impedance tubes – Two-microphone technique for normal sound absorption coefficient and normal surface impedance

Published By Publication Date Number of Pages
BSI 2023 100
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PDF Catalog

PDF Pages PDF Title
62 undefined
64 European foreword
Endorsement notice
66 Foreword
67 1 Scope
2 Normative references
3 Terms, definitions and symbols
71 4 Principle
5 Test equipment
5.1 Construction of the impedance tube
72 5.2 Working frequency range
73 5.3 Length of the impedance tube
5.4 Microphones
5.5 Positions of the microphones
74 5.6 Acoustic centre of the microphone
5.7 Test sample holder
75 5.8 Signal processing equipment
5.9 Loudspeaker
5.10 Signal generator
5.11 Thermometer, barometer and relative humidity
76 6 Preliminary test and measurements
77 7 Test specimen mounting
78 8 Test procedure
8.1 Specification of the reference plane
8.2 Determination of the sound velocity, wavelength and characteristic impedance
79 8.3 Selection of the signal amplitude
8.4 Selection of the number of averages
8.5 Correction for microphone mismatch
8.5.1 General
8.5.2 Measurement repeated with the channels interchanged
80 8.5.3 Predetermined calibration factor
81 8.6 Determination of the transfer function between the two locations
8.6.1 General
8.6.2 Cross- and autospectra-based estimate
83 8.6.3 Frequency-domain deconvolution
8.6.4 Impulse-response based estimate
84 8.7 Determination of the reflection coefficient
8.8 Determination of the sound absorption coefficient
8.9 Determination of the specific acoustic impedance ratio
8.10 Determination of the specific acoustic admittance ratio
85 9 Precision
10 Test report
88 Annex A (normative) Preliminary measurements
90 Annex B (normative) Procedure for the one-microphone technique
91 Annex C (informative) Theoretical background
93 Annex D (informative) Error sources
95 Annex E (informative) Estimation of diffuse sound absorption coefficient  of locally reacting absorbers from the results of this document
96 Annex F (informative) Estimation of intrinsic properties
98 Bibliography

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BS EN ISO 10534-2:2023 - TC
$217.84