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This research aims to evaluate measurement uncertainties in impact noise levels and reductions through interlaboratory testing.

April 24, 2026Open Access

Determination of measurement uncertainties in building acoustics by interlaboratory tests Part 3: Impact noise levels and impact noise reduction

Key Points

This research aims to evaluate measurement uncertainties in impact noise levels and reductions through interlaboratory testing.
Data collected from interlaboratory tests comprising 1614 one-third octave band spectra.
Analysis performed in one-third octave bands and for single-number quantities.
Comparison of derived standard deviations with standardised values in ISO 12999-1.
Average values and standard deviations for reproducibility and repeatability were derived.
Typical values compared to ISO 12999-1 standard found to be reasonable within existing frameworks.
Proposals for revisions to ISO 12999-1 based on analysis.

Abstract

Following similar contributions on the measurement of airborne sound insulation (part 1) and absorption coefficient in reverberation rooms (part 2) this part 3 introduces a data collection on interlaboratory tests on the measurement of impact noise level and impact noise reduction. The data base comprises 1614 one-third octave band spectra in total. The data is analysed in one-third octave bands and also for single-number quantities. Typical average values are derived for the standard deviation of reproducibility, the in-situ standard deviation and the standard deviation of repeatability. The typical values are compared to the values currently standardised in ISO 12999-1 for airborne sound insulation, impact noise level and impact noise reduction to check whether their values are reasonable within the system of existing typical values. Finally, proposals for a possible revision of ISO 12999-1 are derived.

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