GB/T 44808.3-2024 Ergonomics—Accessible design—Part 3:Sound pressure levels of spoken announcements for products and public address systems

Scope

This document specifies the method for determining the sound pressure level of voice announcements when the background noise is less than 80 dB. The method given in this document follows the guidelines of ISO/IEC Guide 71 and takes into account the hearing loss of the elderly to determine the sound pressure level of voice announcements. The sound pressure level of voice announcements specified in this document is applicable to products and public broadcasting systems. To enhance the accessibility and usability of products, voice announcements should not only be audible but also at a comfortable volume. This document applies to consumer products such as home appliances and information and communication technology services with voice announcement functions, as well as products serving ordinary users in indoor and outdoor public places such as train stations, airports, conference rooms, amusement parks, and markets. This document does not apply to products that provide private information, such as ATMs in public places. This document is applicable in the following cases: when the voice announcement speaker is close to the user, and the A-weighted sound pressure level of the background noise in the user's environment does not exceed 80 dB. This document is applicable to products that provide clear and audible voice announcements for users with normal hearing corresponding to their age in quiet and non-reflective acoustic environments. This document applies to recorded and synthesized voices. This document does not apply to products with automatic sound pressure level control systems that can compensate for the effects of time-varying environmental noise. This document does not apply to voice heard through headphones or close to the sound source, such as in-ear headphones specified in IEC 60268-7. This document only considers the audibility of voice, not the process of understanding it. This document does not apply to voice signals used in emergency situat

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