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IEC 60268-16-ed.5.0
Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
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STANDARD published on 25.9.2020
The information about the standard:
Designation standards: IEC 60268-16-ed.5.0
Publication date standards: 25.9.2020
SKU: NS-1006085
The number of pages: 219
Approximate weight : 688 g (1.52 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 60268-16-ed.5.0 :
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. LIEC 60268-16:2020 definit le modele, les signaux dessai, la mesure et les methodes de prevision STI. Lobjectif du present document est de mettre un manuel complet a la disposition de tous les types dutilisateurs du modele STI dans les domaines de laudio, des communications et de lacoustique. Le present document ne donne pas de criteres STI destines a la certification des canaux de transmission (par exemple, criteres pour un systeme dalarme vocale), mais certaines valeurs dapplication courante sont fournies dans lAnnexe G. Chaque methode de mesure presente ses limites, et le lecteur est prie de se referer aux articles correspondants, par exemple concernant la confidentialite des conversations, lecho et les systemes qui utilisent la compression vocale numerique (vocodeurs). Le present document ne couvre pas les cas du bruit fluctuant sur le STI, bien que certains commentaires generaux qui traitent de cette question complexe soient fournis en 7.13 et 8.9.3. LIEC 60268-16:2020 annule et remplace la quatrieme edition parue en 2011. Cette edition constitue une revision technique. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: a) le spectre du signal dessai de la parole masculine a ete modifie pour appliquer des reductions significatives au niveau des bandes de 125 Hz et 250 Hz; b) certaines formules ont ete corrigees; c) des informations supplementaires relatives aux modes operatoires de prediction et de mesure ont ete incluses; d) le spectre et les facteurs de ponderation pour la parole feminine ont ete supprimes; e) des informations de verification pour les dispositifs de mesure STI ont ete ajoutees; f) les relations entre le STI et plusieurs autres mesures de lintelligibilite de la parole ont ete mises a jour en Annexe E; g) des informations supplementaires sont donnees en Annexe M concernant les ajustements des resultats STI mesures afin de simuler les effets dautres niveaux de bruit ambiant et de parole.
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