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EN ISO 24504:2016

Current
Current

The latest, up-to-date edition.

Ergonomics - Accessible design - Sound pressure levels of spoken announcements for products and public address systems (ISO 24504:2014)
Published date

15-06-2016

European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Range of sound pressure level of spoken
  announcements
Annex A (normative) - Method for measuring the
        sound pressure level of spoken announcements
        and ambient noise
Annex B (informative) - Effects of age-related hearing
        loss on word recognition
Annex C (informative) - Examples of measurement condition
        and result records
Annex D (informative) - STI method to determine minimum
        speech level
Bibliography

ISO 24504:2014 specifies methods to determine an appropriate sound pressure level range for spoken announcements in environments where ambient noise is less than 80 dB. The specified methods follow the concepts of ISO/IEC Guide 71 and includes consideration of older persons with decreased hearing ability to determine sound pressure levels of spoken announcements. The spoken speech levels specified are for products and public-address systems. ISO 24504:2014 is applicable when a loudspeaker producing a spoken announcement is located a short distance from the user in an environment where the sound pressure level with a standard frequency weighting A of ambient noise does not exceed 80 dB. It is applicable to spoken announcements that are audible to persons with normal hearing for their age when presented by a target product under quiet and anechoic conditions, and for both recorded voice and synthetic speech announcements.It is not applicable to products providing private information such as automated teller machines in public spaces, nor to spoken announcements heard through headphones or earphones, or with the ear close to the speech sound source such as ear speakers. It does not specify the sound pressure levels of spoken announcements for systems with automatic sound pressure level control to compensate for fluctuating ambient noise levels, nor those presented in emergency situations such as signals for fire alarms, gas leakage and crime prevention (covered in ISO 7240‑16 and ISO 7240‑19), or in automobiles (covered in ISO 15006). It considers only the audibility of speech and not the process of speech understanding.

Committee
CEN/TC 122
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

ISO 15006:2011 Road vehicles — Ergonomic aspects of transport information and control systems — Specifications for in-vehicle auditory presentation
ISO 9921:2003 Ergonomics Assessment of speech communication
ISO 3382-2:2008 Acoustics Measurement of room acoustic parameters Part 2: Reverberation time in ordinary rooms
ISO 7240-16:2007 Fire detection and alarm systems — Part 16: Sound system control and indicating equipment
IEC 60268-7:2010 Sound system equipment - Part 7: Headphones and earphones
IEC 60050-801:1994 International Electrotechnical Vocabulary (IEV) - Part 801: Acoustics and electroacoustics
ISO 389-1:1998 Acoustics Reference zero for the calibration of audiometric equipment Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
ISO 1996-1:2016 Acoustics Description, measurement and assessment of environmental noise Part 1: Basic quantities and assessment procedures
IEC 60268-16:2011 Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
ISO 8253-1:2010 Acoustics Audiometric test methods Part 1: Pure-tone air and bone conduction audiometry
ISO 18233:2006 Acoustics Application of new measurement methods in building and room acoustics
ISO/IEC Guide 71:2014 Guide for addressing accessibility in standards
ISO 1999:2013 Acoustics Estimation of noise-induced hearing loss
ISO 7240-19:2007 Fire detection and alarm systems — Part 19: Design, installation, commissioning and service of sound systems for emergency purposes
ISO/TR 22411:2008 Ergonomics data and guidelines for the application of ISO/IEC Guide 71 to products and services to address the needs of older persons and persons with disabilities
IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
ISO 7029:2017 Acoustics — Statistical distribution of hearing thresholds related to age and gender

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