This part of IS0 717
a)
b)
C)
defines single-number quantities for the impact
sound insulation in buildings and of floors;
gives rules for determining these quantities from
the results of measurements carried out in onethird-
octave bands in accordance with IS0 140-6
and IS0 140-7, and in octave bands in accordance
with that option in IS0 140-7 for field measurements
only; and
defines single-number quantities for the impact
sound reduction of floor coverings and floating
floors from the results of measurements carried
out in accordance with IS0 140-8.
The single-number quantities in accordance with this
part of IS0 717 are intended for rating the impact
sound insulation and for simplifying the formulation of
acoustical requirements in buidling codes. The required
numerical values of the single-number quantities
are specified according to varying needs.
The rating of results from measurements carried out
over an enlarged frequency range is dealt with in annex
A.
A method for obtaining single-number quantities for
bare massive floors according to their performance in
combination with floor coverings is described in annex
B.
An example of the calculation of a single-number
quantity is given in annex C.
Die in den Teilen 1 und 2 der ISO 717 enthaltenen Textstellen zum Runden von Daten sind nicht sehr genau und führen zu unterschiedlichen Auslegungen, insbesondere dann, wenn sie numerisch in der Rechnersoftware verwendet werden. Diese Änderung zur EN ISO 717-2:1996 enthält einige Präzisierungen zu Folgendem: Unterabschnitt 4.3.1: Messungen in Terzbändern; Unterabschnitt 4.3.2: Messungen in Oktavbändern; Anhang A (informativ): Berechnung der Spektrum-Anpassungswerte; Anhang B (informativ); Anhang C (informativ).