BS ISO 532-1:2017
Current
The latest, up-to-date edition.
Acoustics. Methods for calculating loudness Zwicker method
Hardcopy , PDF
English
25-09-2018
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Specification of input signal and instrumentation
5 Method for stationary sounds
6 Method for time-varying sounds
7 Reporting data
Annex A (normative) - Numerical details and program
code for the calculation of loudness of stationary
and time-varying sounds (test implementation)
Annex B (normative) - Test signals for the validation
of implementation
Annex C (informative) - Graphical user interface for
the calculation of loudness of stationary and
time-varying sounds
Annex D (informative) - Guidance for determining
the loudness when using head and torso simulator
microphones
Annex E (informative) - Uncertainty considerations
Bibliography
Describes two methods for estimating the loudness and loudness level of sounds as perceived by otologically normal persons under specific listening conditions.
| Committee |
EH/1/1
|
| DevelopmentNote |
Supersedes 16/30275390 DC. (06/2017)
|
| DocumentType |
Standard
|
| ISBN |
9780539019872
|
| Pages |
70
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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 AnnexD). Since most important technical sounds are time-varying, a model of time-varying loudness is preferable.
The methods are based on the Zwicker algorithm.[14] The method for stationary sounds is provided for reasons of continuity and also offers the use of measured one-third-octave-band levels as input. The more general method for arbitrary sounds calculates the specific loudness pattern based on measured time signals by applying a signal processing model that is directly related to physiological and psychological characteristics of the human hearing system. Loudness is calculated from the specific loudness pattern. It has been shown that this method provides a good match to the results of many loudness experiments using synthetic and technical sounds.
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.
| Standards | Relationship |
| ISO 532-1:2017 | 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 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 |
| 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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