Acoustics - Methods for calculating loudness - Part 1: Zwicker method
|Publication Date:||1 June 2017|
|ICS Code (Acoustic measurements and noise abatement in general):||17.140.01|
This document specifies two methods for estimating the loudness and loudness level of sounds as perceived by otologically normal persons under specific listening conditions. The first method is intended for stationary sounds and the second method for arbitrary non-stationary (time-varying) sounds, including stationary sounds as a special case.
The methods can be applied to any sound recorded as single-channel measurements using a microphone, or as multi-channel measurements, for example by means of a head and torso simulator (see Annex D). Since most important technical sounds are time-varying, a model of time-varying loudness is preferable.
The methods are based on the Zwicker algorithm. The method for stationary sounds is provided for reasons of continuity and also offers the use of measured one-third-octave-ban
No prior knowledge about the properties of the sound (e.g. broadband or narrowband noise, tonal content) and no user interactions are required for the fully automated application of the method.
The evaluation of the harmful effect of sound events is outside the scope of this document.