ISO 717-1:2020 pdf download – Acoustics — Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation.
3? Terms? and? definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at http:// www .electropedia .org/ 3.1 single-number quantity <for airborne sound insulation rating> value, in decibels, of the reference curve at 500 Hz after shifting it in accordance with the method specified in this document Note 1 to entry: Terms and symbols for the single-number quantity used depend on the type of measurement. Examples are listed in Table 1 for airborne sound insulation properties of building elements and in Table 2 for airborne sound insulation in buildings. In general, new single-number quantities are derived in a similar way. 3.2 spectrum adaptation term value, in decibels, to be added to the single-number rating (e.g. R w ) to take account of the characteristics of particular sound spectra Note 1 to entry: Two sound spectra are defined (in one-third-octave bands and in octave bands) in this document. Note 2 to entry: Annex A gives information on the purpose of introducing these two spectrum adaptation terms C and C tr . 4 Procedure for evaluating single-number quantities 4.1 General The values obtained in accordance with e.g. ISO 10140-2 and ISO 16283-1 are compared with reference values (see 4.2) at the frequencies of measurement within the range 100 Hz to 3 150 Hz for one-third- octave bands and 125 Hz to 2 000 Hz for octave bands. The comparison shall be carried out as specified in 4.4. Furthermore, two spectrum adaptation terms shall be calculated (see 4.5) based on two typical spectra within the frequency range as quoted above. These two terms may optionally be supplemented by additional spectrum adaptation terms covering (if need be and if measured data are available) a wider frequency range between 50 Hz and 5 000 Hz.