Spektrum‐Anpassungswerte C und Ctr: Vergleich der Einzahlangaben für die Luftschalldämmung in Gebäuden R 'w und D nT,w.

Spectrum adaptation term C and Ctr – Comparison of the single‐number ratings for airborne sound insulation in buildings R'w and DnT,w In order to take into account different sound level spectra of different noise sources, such as those for noise in a building and those for traffic noise outside a building, so‐called spectrum adaptation term can be added to the respective single‐number value of the sound insulation. With the characteristic size R'w, as well as the standard sound level difference DnT,w a new single specification is thus possible, which should better represent the actual sound insulation. A close examination shows that spectrum adaptation terms cannot be applied by simple equation, but that the required spectrum adaptation terms must in principle be determined for the corresponding applicable number specification according to DIN EN ISO 717‐1. For the present study, a measurement data set of 43 quality tests for airborne sound insulation was used and a deviation of ±1 dB between the C‐ and Ctr‐values was found. A simplified conversion of the single‐figure information as shown e.g. in DIN 4109‐2 cannot be transferred to the spectrum adaptation terms. [ABSTRACT FROM AUTHOR]