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eLibrary > BS EN ISO 10534-2:2023 - TC Tracked Changes. Acoustics. Determination of acoustic properties in impedance tubes - Two-microphone technique for normal sound absorption coefficient and normal surface impedance >

BS EN ISO 10534-2:2023 - TC Tracked Changes. Acoustics. Determination of acoustic properties in impedance tubes - Two-microphone technique for normal sound absorption coefficient and normal surface impedance, 2023

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BS EN ISO 10534-2:2023 - TC Tracked Changes. Acoustics. Determination of acoustic properties in impedance tubes - Two-microphone technique for normal sound absorption coefficient and normal surface impedance, 2023

A-30427271.pdf [Go to Page]
undefined [Go to Page]
European foreword
Endorsement notice
Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Principle
5 Test equipment [Go to Page]
5.1 Construction of the impedance tube
5.2 Working frequency range
5.3 Length of the impedance tube
5.4 Microphones
5.5 Positions of the microphones
5.6 Acoustic centre of the microphone
5.7 Test sample holder
5.8 Signal processing equipment
5.9 Loudspeaker
5.10 Signal generator
5.11 Thermometer, barometer and relative humidity
6 Preliminary test and measurements
7 Test specimen mounting
8 Test procedure [Go to Page]
8.1 Specification of the reference plane
8.2 Determination of the sound velocity, wavelength and characteristic impedance
8.3 Selection of the signal amplitude
8.4 Selection of the number of averages
8.5 Correction for microphone mismatch [Go to Page]
8.5.1 General
8.5.2 Measurement repeated with the channels interchanged
8.5.3 Predetermined calibration factor
8.6 Determination of the transfer function between the two locations [Go to Page]
8.6.1 General
8.6.2 Cross- and autospectra-based estimate
8.6.3 Frequency-domain deconvolution
8.6.4 Impulse-response based estimate
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
9 Precision
10 Test report
Annex A (normative) Preliminary measurements
Annex B (normative) Procedure for the one-microphone technique
Annex C (informative) Theoretical background
Annex D (informative) Error sources
Annex E (informative) Estimation of diffuse sound absorption coefficient of locally reacting absorbers from the results of this document
Annex F (informative) Estimation of intrinsic properties
Bibliography [Go to Page]

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BS EN ISO 10534-2:2023 - TC Tracked Changes. Acoustics. Determination of acoustic properties in impedance tubes - Two-microphone technique for normal sound absorption coefficient and normal surface impedance, 2023

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