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BS ISO 532-2:2017

Current
Current

The latest, up-to-date edition.

Acoustics. Methods for calculating loudness Moore-Glasberg method
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

07-06-2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Specifications of signals
6 Instrumentation
7 Description of the method
8 Calculation of loudness and loudness level
9 Uncertainty of calculated loudness for stationary sounds
10 Data reporting
Annex A (informative) - Comments regarding binaural
        loudness
Annex B (informative) - Results for specific test signals
Annex C (informative) - Software for the calculation
        of loudness
Bibliography

Describes a method for estimating the loudness and loudness level of stationary sounds as perceived by otologically normal adult persons under specific listening conditions.

This document specifies a method for estimating the loudness and loudness level of stationary sounds as perceived by otologically normal adult persons under specific listening conditions. It provides an algorithm for the calculation of monaural or binaural loudness for sounds recorded using a single microphone, using a head and torso simulator, or for sounds presented via earphones. The method is based on the Moore-Glasberg algorithm.

NOTE1 Issues of binaural calculations are discussed in AnnexA.

NOTE2 Users who wish to study the details of the calculation method can review or implement the source code, which is entirely informative and provided with this document for the convenience of the user.

This method can be applied to tones, broadband noises and complex sounds with sharp line spectral components, for example transformer hum or fan noise.

NOTE3 It has been shown (see Reference [15]) that this method provides a good match to the contours of equal loudness level as defined in ISO226:2003 and the reference threshold of hearing as defined in ISO389‑7:2005 .

The evaluation of the harmful effect of sound events is outside the scope of this document.

Committee
EH/1/1
DevelopmentNote
Supersedes 16/30275393 DC. (07/2017)
DocumentType
Standard
Pages
40
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
ISO 532-2:2017 Identical

ISO 11200:2014 Acoustics Noise emitted by machinery and equipment Guidelines for the use of basic standards for the determination of emission sound pressure levels at a work station and at other specified positions
IEC 60050-702:1992 International Electrotechnical Vocabulary (IEV) - Part 702: Oscillations, signals and related devices
ISO 389-7:2005 Acoustics Reference zero for the calibration of audiometric equipment Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions
ISO 3740:2000 Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic standards
ISO 80000-8:2007 Quantities and units Part 8: Acoustics
ISO 532:1975 Acoustics Method for calculating loudness level
ISO 1996-1:2016 Acoustics Description, measurement and assessment of environmental noise Part 1: Basic quantities and assessment procedures
ISO 9612:2009 Acoustics Determination of occupational noise exposure Engineering method
IEC 61260-1:2014 Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
ISO 11904-1:2002 Acoustics — Determination of sound immission from sound sources placed close to the ear — Part 1: Technique using a microphone in a real ear (MIRE technique)
IEC TS 60318-7:2017 Electroacoustics - Simulators of human head and ear - Part 7: Head and torso simulator for the measurement of air-conduction hearing aids
ISO 226:2003 Acoustics — Normal equal-loudness-level contours
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)

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