BS EN ISO 24504:2016规定了确定适当声压级范围的方法 用于环境噪声小于80 dB的环境中的语音通知。指定的 方法遵循ISO/IEC指南71的概念，包括考虑老年患者 听力下降，无法确定口头通知的声压级。口语 本国际标准中规定的语音级别适用于产品和公共广播 系统。为了提高产品的可访问性和可用性，口头通知不仅必须 能够听到，但也能以舒适的语言水平呈现。 发布口头声明的目标产品是消费产品，如电子家电、信息和通信技术服务，以及为消费者提供服务的产品 室内外公共设施的一般用户，如火车站、机场、会议室、， 游乐园和集市。本国际标准不适用于提供私人信息的产品，例如 公共场所的自动取款机。本国际标准适用于生产语音广播的扬声器 位于距离用户较近的环境中，该环境的声压级符合标准 环境噪声的频率加权不超过80 dB。本国际标准适用 对于听力正常的同龄人来说，在演讲时可以听到的口头通知 由目标产品在安静和消声条件下进行。本国际标准适用于: 录音和合成语音公告。本国际标准未规定广播语音的声压级 带有自动声压级控制的系统，以补偿环境噪音水平的波动。本国际标准不适用于通过耳机或入耳式耳机听到的口头通知，或耳朵靠近语音声源听到的口头通知，例如: IEC 60268-7中规定的入耳式扬声器。本国际标准仅考虑了声音的可听性 而不是语言理解的过程。本国际标准未规定语音公告的声压级 在火灾报警、气体泄漏和犯罪预防等紧急情况下显示； ISO 7240-16和ISO 7240-19涵盖了这些内容。本国际标准未规定 汽车语音广播的声压级；这些都包含在ISO 15006中。注1:电子家电等产品以重复方式呈现的语音公告被视为听觉信号，而非信息，因此，语音公告的声压级低于本国际标准的规定。 注2:众所周知，以英语为母语的人的单词识别性能 公告比非母语人士的公告要好。交叉引用:ISO 389-1ISO 1996-1ISO 3382-2:2008ISO 8253-1IEC 60050-801IEC 60268-16IEC 61260IEC 61672-1ISO 9921:2003ISO/IEC指南71:2001ISO/TR 22411:2008IEC 60268-7:2010ISO 7240-16:2007ISO 15006:2011ITU-T P.800ISO 7029:2000ISO 1999:2013ISO 18233:2006购买本文件时可提供的所有现行修订版。

BS EN ISO 24504:2016 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 that are specified in this International Standard are for products and public-address systems. To improve the accessibility and usability of products, spoken announcements must not only be audible but also presented at comfortable speech levels.The target products that present spoken announcements are consumer products such as electronic home appliances, information and communication technology services, and products providing services for general 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 as automated teller machines in public spaces.This International Standard 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. This International Standard 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. This International Standard is applicable for both recorded voice and synthetic speech announcements.This International Standard does not specify sound pressure levels of spoken announcements for systems 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 or earphones, or to spoken announcements heard with the ear close to the speech sound source, such as in ear speakers specified in IEC 60268-7. This International Standard considers only the audibility of speech and not the process of speech understanding.This International Standard does not specify the sound pressure levels of spoken announcements presented 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 the sound 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 home appliance is presumed to be heard as an auditory sign but not as a message and is therefore usable with a lower sound 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 the announcement is better than that of non-native speakers.Cross References:ISO 389-1ISO 1996-1ISO 3382-2:2008ISO 8253-1IEC 60050-801IEC 60268-16IEC 61260IEC 61672-1ISO 9921:2003ISO/IEC Guide 71:2001ISO/TR 22411:2008IEC 60268-7:2010ISO 7240-16:2007ISO 7240-19:2007ISO 15006:2011ITU-T P.800ISO 7029:2000ISO 1999:2013ISO 18233:2006All current amendments available at time of purchase are included with the purchase of this document.