Acoustics: Human sound perception – measurement positions for measurement of loudness (NT ACOU 110)

  • Report #: NT ACOU 110
  • Approved: May 2002
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The traditional physical descriptor, the A-weighted sound pressure level, LPA, is often not an adequate objective descriptor for perceived sound. The sounds of different products with the same LPA do not always sound equally intense to the user. So, objective descriptors are needed, which correlate better with subjective perception, as a supplement to the A-weighting based parameters sound pressure and sound power. The scope of this Nordtest Guideline is to supplement existing standards for measurements of sound pressure levels and sound power levels with guidelines for measurements (and calculations) of loudness and other psychoacoustic descriptors for product sound quality.