Scope
This standard specifies a field method to determine the apparent speech level reduction of furniture ensembles and enclosures in field conditions. Engineering grade of accuracy is possible in semireverberant rooms and survey grade of accuracy is possible in any kind of room . The method is applicable 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. This method is not intended for single components used in workstations, such as a scree n, a storage unit, a table, a luminaire, a cupboard, a bookshelf, a standard chair, a wall absorber, or a ceiling absorber.
Purpose
The existing ISO 23351-1 describes a method to determine the apparent speech level reduction of furniture ensembles and enclosures in laboratory conditions. Due to its limitations, it cannot be applied in all necessary situations. A second part for field method is necessary to fix this shortage.
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