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A Comparison of NIC′ and ΔdBA Rating Schemes for Determining Speech-Privacy Potential of Open-Plan Office Space

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Data are presented to show that the difference in A-weighted sound pressure level (ΔdBA) between the source and receiving zones in an open-plan office space is significantly influenced, as expected, by the shape of the noise spectrum used to carry out the test. Consequently, so is the degree of agreement between the ΔdBA rating and the Speech Privacy Noise Isolation Class (NIC′) rating. A spectrum is presented that yields a maximum ±1 dB difference between the AdBA and NIC′ ratings for a variety of open-plan space configurations.


Es werden Ergebnisse vorgelegt, die zeigen, daß der Unterschied des A-bewerteten Schalldruckpegels (ΔdB(A)) zwischen Quellen- und Empfangsbereichen in einem Großraumbüro erwartungsgemäß deutlich von der Spektralform des zur Messung benutzten Geräusches beeinflußt wird. Das gleiche gilt demgemäß für die Übereinstimmung zwischen der ΔdB(A)-Beurteilung und derjenigen auf Grund der ,,Speech Privacy Noise Isolation Class (NIC′)“. Es wird ein Spektrum angegeben, welches eine maximale Differenz von ±1 dB zwischen der ΔdB(A)- und der NIC′-Beurteilung für eine Vielfalt von Großraumkonfigurationen ergibt.


On présente des résultats prouvant que la différence (en niveau de pression sonore à pondération A:ΔdBA) entre les zones d'émission et de réception acoustique dans une espace de bureaux ouverts est influencée d'une manière significative, comme on pouvait s'y attendre, par la forme spectrale du bruit utilisé pour effectuer ce test. Il en va de même, par conséquent, du degré de concordance entre le procédé ΔdBA et le procédé NIC′ (Speech Privacy Noise Isolation Class). On présente un spectre de bruit qui limite à ± 1 dB la différence entre les estimations ΔdBA et NIC′ pour toute une catégorie de configurations des espaces de bureaux ouverts.
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Document Type: Research Article

Publication date: October 1, 1978

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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