ISO 532-1-2017 pdf free.Acoustics -Methods for calculatingloudness — Zwicker method.
This document specifies two methods for estimating the loudness and loudness level of sounds asperceived by otologically normal persons under specific listening conditions. The first method isintended 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 mostimportant technical sounds are time-varying, a model of time-varying loudness is preferable.The methods are based on the Zwicker algorithm.l14]The method for stationary sounds is provided forreasons of continuity and also offers the use of measured one-third-octave-band levels as input. Themore general method for arbitrary sounds calculates the specific loudness pattern based on measuredtime signals by applying a signal processing model that is directly related to physiological andpsychological characteristics of the human hearing system. Loudness is calculated from the specificloudness pattern. It has been shown that this method provides a good match to the results of manyloudness experiments using synthetic and technical sounds.
No prior knowledge about the properties of the sound (e.g.broadband or narrowband noise, tonalcontent) 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.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies.Forundated references, the latest edition of the referenced document (including any amendments) applies.IEC 61260-1:2014，Electroacoustics – Octave-band and fractional-octave-band filters — Part 1:Specifications
IEC 61672-1:2013,Electroacoustics — Sound level meters —Part 1: Specifications
For the purposes of this document, the following terms and definitions apply.ISO 532 pdf download.