声音系统设备 - 第16部分:通过语音传输指数的语音清晰度的客观评价

[中文适用范围]： IEC 60268-16 第 16 部分定义了 STI 模型、测试信号、测量和预测方法。本文件的目的是为音频、通信和声学领域的所有 STI 模型用户提供全面的指南。本文件不提供传输信道认证的 STI 标准（例如语音报警系统的标准），但附录 G 提供了一些典型应用值。每种测量方法都有其局限性，读者可参考有关局限性（如语音隐私、回声和使用数字语音压缩的 vocoders 系统）的条款。本文件不涵盖背景噪声波动对 STI 的影响，尽管第 7.13 和 8.9.3 节提供了一些处理这一复杂问题的总体评论。 [外文原描述]： IEC 60268-16:2020 defines the STI model, test signals, measurement and prediction methods. The objective of this document is to provide a comprehensive manual for all types of users of the STI model in the fields of audio, communications and acoustics. This document does not provide STI criteria for certification of transmission channels (e.g. criteria for a voice-alarm system), but some typical application values are provided in Annex G. Every measurement method has limitations, and the reader is referred to clauses relating to limitations such as speech privacy, echo and systems using digital voice compression (vocoders). This document does not cover the case of fluctuating noise on the STI, although some general comments on dealing with this complex issue are provided in 7.13 and 8.9.3. IEC 60268-16:2020 cancels and replaces the fourth edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the spectrum of the male speech test signal has been changed, with significant reductions in the 125 Hz and 250 Hz bands being implemented; b) some corrections to formulae have been made; c) additional information has been included on prediction and measurement procedures; d) spectrum and weighting factors for female speech have been removed; e) verification information for STI measurement devices added; f) the relationships between STI and number of other speech intelligibility measures have been updated in Annex E; g) greater information is given in Annex M about adjustments to the measured STI results to simulate effects of alternative ambient noise and speech levels. The content of the corrigendum 1 (2025-07) has been included in this copy.