ISO 24504:2014 人类工效学 无障碍设计 公告产品和公共地址系统的声压级

标准编号：ISO 24504:2014

中文名称：人类工效学 无障碍设计 公告产品和公共地址系统的声压级

英文名称：Ergonomics — Accessible design — Sound pressure levels of spoken announcements for products and public address systems

发布日期：2014-08

标准范围

This International Standard specifies methods to determine an appropriate sound pressure level rangefor spoken announcements in environments where ambient noise is less than 80 dB. The specifiedmethods follow the concepts of ISO/IEC Guide 71 and includes consideration of older persons withdecreased hearing ability to determine sound pressure levels of spoken announcements. The spokenspeech levels that are specified in this International Standard are for products and public-addresssystems. To improve the accessibility and usability of products, spoken announcements must not onlybe audible but also presented at comfortable speech levels.The target products that present spoken announcements are consumer products such as electronic homeappliances, information and communication technology services, and products providing services forgeneral users in public facilities indoors and outdoors such as train stations, airports, meeting rooms,amusement parks, and fairs.This International Standard is not applicable to products providing private information such asautomated teller machines in public spaces.This International Standard is applicable when a loudspeaker producing a spoken announcement islocated a short distance from the user in an environment where the sound pressure level with a standardfrequency weighting A of ambient noise does not exceed 80 dB. This International Standard is applicableto spoken announcements that are audible to persons with normal hearing for their age when presentedby a target product under quiet and anechoic conditions. This International Standard is applicable forboth recorded voice and synthetic speech announcements.This International Standard does not specify sound pressure levels of spoken announcements forsystems with automatic sound pressure level control to compensate for fluctuating ambient noise levels.This International Standard is not applicable to spoken announcements heard through headphones orearphones, or to spoken announcements heard with the ear close to the speech sound source, such asin ear speakers specified in IEC 60268-7. This International Standard considers only the audibility ofspeech and not the process of speech understanding.This International Standard does not specify the sound pressure levels of spoken announcementspresented in emergency situations such as signals for fire alarms, gas leakage, and crime prevention;those are covered in ISO 7240-16 and ISO 7240-19. This International Standard does not specify thesound pressure levels of spoken announcements in automobiles; those are covered in ISO 15006.NOTE 1 A spoken announcement presented in a repetitive manner from a product such as electronic homeappliance is presumed to be heard as an auditory sign but not as a message and is therefore usable with a lowersound pressure level of the spoken announcement than this International Standard specifies.NOTE 2 It is known that the word recognition performance of native speakers of the language of theannouncement is better than that of non-native speakers.

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