Comparison of different in situ measurements techniques of intelligibility in an open-plan office

D’Orazio, Dario; Rossi, E.; Garai, Massimo

doi:10.1177/1351010x18776431

Cited by 14 publications

(14 citation statements)

References 9 publications

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“…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. ISO 3382-3 [6] states that the mean of L pA,B values along the measurement positions shall be used in the position-dependent STI determinations.…”

Section: Introductionmentioning

confidence: 62%

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

Hongisto¹,

Keränen²

2021

Applied Sciences

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ISO 3382-3 is globally used to determine the room acoustic conditions of open-plan offices using in situ measurements. The key outcomes of the standard are three single-number quantities: distraction distance, rD, A-weighted sound pressure level of speech, Lp,A,S,4m, and spatial decay rate of speech, D2,S. Quantities Lp,A,S,4m and D2,S describe the attenuation properties of the office due to room and furniture absorption and geometry. Our purpose is to introduce a new single-number quantity, comfort distance rC, which integrates the quantities Lp,A,S,4m and D2,S. It describes the distance from an omnidirectional loudspeaker where the A-weighted sound pressure level of normal speech falls below 45 dB. The study explains why the comfort criterion level is set to 45 dB, explores the comfort distances in 185 offices reported in previous studies. Based on published data, the rC values lie typically within 3 m (strong attenuation) and 30 m (weak attenuation). Based on this data, a classification scheme was proposed. The new quantity could benefit the revised version of ISO 3382-3.

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Section: Introductionmentioning

confidence: 62%

“…The limit values for classes A to D became 5, 7, 9, and 11 m for rC. The ranges for classes A-D are [0-5) m, [5][6][7] m, [7][8][9] m, and [9][10][11] Using the same criteria, the proposed limit values for classes A to D became 11, 9, 7, and 5 dB for D 2,s , 47, 49, 51, and 53 dB for L p,A,S,4m , and 6, 8, 10, and 12 m for r D .…”

Section: Resultsmentioning

confidence: 99%

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

Hongisto¹,

Keränen²

2021

Applied Sciences

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“…The significant role played by speech intelligibility is on the basis of several analysis, measurements, and studies carried out in Spanish, Portoguese, Italian, English, and American churches. 6 The Speech Transmission Index ( STI ), defined by IEC 60268-16:2011, 9 describes the quality of the speech communication that closely depends on the signal-to-noise ratio (SNR), 10 where the signal is the sound pressure level at the receiver position.…”

Section: Acoustic Comfort In Churchesmentioning

confidence: 99%

Acoustic comfort in a worship space made of cross-laminated timber

2019

Self Cite

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The construction of a new worship space in cross-laminated timber provides a good opportunity to include acoustic needs in the whole design development. The surface porosity and the lightweight of wooden elements may be carefully considered in order to improve the intelligibility of priests' voice. In this work, a practical approach for obtaining a global acoustic comfort using sustainable materials is provided, using geometrical acoustic simulations. Material properties and architectural geometries were taken into account in order to evaluate subjective reverberation, speech intelligibility, and spatial perception over the whole audience. Results show how the sound energy distribution in the case study follows the sound field models proposed by scholars and how the ceiling shape-inspired by industrial sheds-contributes to the acoustic comfort of the faithfuls.

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“…In article [8], the DIRAC software application was used to compare the results of STI measurements by direct and indirect methods. Exponential sweep signal was used in indirect STI measurements.…”

Section: Introductionmentioning

confidence: 99%

Multicomponent Signal for Comparing Direct and Indirect Methods of Speech Transmission Index Measurement

Prodeus,

Dvornyk,

Naida

et al. 2023

ECS

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When evaluating the intelligibility of speech distorted by noise and reverberation, direct or indirect methods of measuring the speech transmission index are used. However, it remains insufficiently studied how significantly differ the results of measurements obtained by direct and indirect methods. To find an answer to this question, the use of a multicomponent test signal consisting of four "elementary" signals separated by pauses is proposed in this paper. As "elementary" signals, it is proposed to use a maximum-length sequence, a speech shaped maximum-length sequence, a speech shaped stationary noise, and a speech shaped amplitude-modulated noise. Use of amplitude-modulated noise allows estimating speech transmission index by a direct method. Other "elementary" signals make it possible to estimate speech transmission index by two variants of indirect method. The proposed algorithms and corresponding computer programs were tested on trial signal models, while the consistency of the obtained results with the results of previous studies was revealed. The results of the signal models studies show that both considered variants of the indirect speech transmission index measurement method lead to underestimated results compared to the direct method. For one of the variants of the indirect method, the value of the estimate bias is 0.03–0.04, regardless of the interfering conditions. For another variant of the indirect method, the estimate bias varies from 0.01 to 0.18, depending on the interference conditions.

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Comparison of different in situ measurements techniques of intelligibility in an open-plan office

Cited by 14 publications

References 9 publications

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

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

Acoustic comfort in a worship space made of cross-laminated timber

Multicomponent Signal for Comparing Direct and Indirect Methods of Speech Transmission Index Measurement

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