Akustik i byggnader. Ljudisolering.

Kommittébeteckning: SIS/TK 197 (Byggakustik)
Källa: ISO
Svarsdatum: den 29 aug 2019
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The purpose of the method is to facilitate the comparison of furniture ensembles and enclosures (herein: "product") with respect to their ability to reduce the speech level of the occupant speaking inside the product.

In this method, the sound power level is measured in two scenarios: (1) without the product, and (2) with the product. During scenario (1), the test signal is produced by the sound source in an empty room while the product is absent. During scenario (2), the test signal is produced by the sound source inside the product in the occupant’s position. Level reduction is the difference of the sound power levels measured in the two scenarios in 1/1-octave frequency bands from 125 to 8000 Hz. Speech level reduction is a single-number quantity that expresses the corresponding reduction in A-weighted sound power level of standard speech within the entire frequency range from 125 to 8000 Hz.

A commercial product or a prototype tested according to this standard shall have a predefined size, geometry, and material listing. The position(s) of the occupant(s) shall be clearly identifiable.

This method is not intended for single products used in workstations, such as a screen, a storage unit, a table, a luminaire, a cupboard, a bookshelf, a standard chair, a wall absorber, or a ceiling absorber. The method is intended for entire furniture ensembles or enclosures, which form a unity that serves one or several occupants, and which are also used to provide improved speech privacy. For example, a workstation is tested in such a form that it involves all components that are used in the specific workplace configuration as shown in Figure 1a.

 

Figure 1 — Examples of products that could be tested according to this method: (a) workstation with open ceiling, (b) workstation with closed ceiling, (c) partially closed chair, (d) sofa group for meetings, (e) mobile working booth, and (f) mobile phone booth. The sound source is located to the most probable position of the occupant’s head. The occupant is sitting in examples (a)−(e) and standing in example (f).