Precision of ISO 3382-2 and ISO 3382-3 – A Round-Robin test in an open-plan office

Comfort Distance—A Single-Number Quantity Describing Spatial Attenuation in Open-Plan Offices

“…If Lp,A,S equals the comfort criterion level, Lp,A,C, the distance rC, where this is achieved, i.e., comfort distance, gets a general form: ISO 3382-3 [6] defines the SPL of normal effort speech to be used in the determination of the abovementioned SNQs. This guarantees that different operators obtain similar measurement results from the same office as shown by the Round Robin test of Hongisto et al [7]. D'Orazio et al [8] reported measurement results from the office where the background noise level, L p,A,B , varied even 13 dB within a single measurement path.…”

“…In such special cases, the uncertainty of r D and r P may be higher than in the Round Robin test of Ref. [7] where the spatial distribution of background noise was smooth.…”

“…This form was recently used by Hongisto et al [7]. They set the comfort criterion level to L p,A,C = 45 dB.…”

Measurement uncertainty and unicity of single number quantities describing the spatial decay of speech level in open-plan offices

“…The measurement uncertainties are represented in Figure 6, and their overall extremums are presented in Table 2 together with the measurement uncertainties put forward by Haapakangas et al [6], Yadav et al [7] and Hongisto et al [8]. Table 2: Magnitude of measurement uncertainties obtained with the simulations (considering the measurement paths in their entirety -N=7 -or only the 4 closest measurement positions -N=4) compared to the literature.…”

“…Based on 36 measurements, the study concluded that the measurement uncertainty of D2S and LpAS4m are 0.6 dB(A) and 1.0 dB(A), respectively. Finally, Hongisto et al [8] conducted a round-robin test, evaluating the reproducibility of the metrics of ISO 3382-3 (2012). The test took part in an office of rather low acoustic quality (D2S, LpAS4m and rc of about 3.8 dB(A), 52.5 dB(A) and 17 m).…”