IEC 60268-16:2020/COR1:2025 - Corrigendum 1: Sound system equipment -

Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index

Corrigendum 1: Equipements pour systèmes électroacoustiques - Partie 16: Évaluation objective de l'intelligibilité de la parole au moyen de l'indice de transmission de la parole

General Information

Status: Published
Publication Date: 06-Jul-2025

ICS: 33.160.01 - Audio, video and audiovisual systems in general

Technical Committee: TA 20 - Analogue and digital audio
Drafting Committee: MT 60268-16 - TC 100/TA 20/MT 60268-16

Current Stage: PPUB - Publication issued
Start Date: 07-Jul-2025
Completion Date: 21-Aug-2025

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Corrects: IEC 60268-16:2020 - Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
Effective Date: 26-Oct-2025

IEC 60268-16:2020/COR1:2025 - Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
Released:7. 07. 2025 - Page 1 preview

Standard

IEC 60268-16:2020/COR1:2025 - Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index Released:7. 07. 2025

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Frequently Asked Questions

What is IEC 60268-16:2020/COR1:2025?

IEC 60268-16:2020/COR1:2025 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index". This standard covers: Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index

What is the scope of IEC 60268-16:2020/COR1:2025?

Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index

What ICS categories does IEC 60268-16:2020/COR1:2025 belong to?

IEC 60268-16:2020/COR1:2025 is classified under the following ICS (International Classification for Standards) categories: 33.160.01 - Audio, video and audiovisual systems in general. The ICS classification helps identify the subject area and facilitates finding related standards.

What standards are related to IEC 60268-16:2020/COR1:2025?

IEC 60268-16:2020/COR1:2025 has the following relationships with other standards: It is inter standard links to IEC 60268-16:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

How can I purchase IEC 60268-16:2020/COR1:2025?

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Standards Content (Sample)

IEC 60268-16:2020/COR1:2025 - ...

INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 60268-16 IEC 60268-16
Edition 5.0 2020-09 Édition 5.0 2020-09

Sound system equipment - Équipements pour systèmes
Part 16: Objective rating of speech électroacoustiques -
intelligibility by speech transmission index Partie 16: Évaluation objective de
l'intelligibilité de la parole au moyen de l'indice
de transmission de la parole
CO RRI G E NDUM 1
Corrections to the French version appear after the English text.
Les corrections à
...

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Sound system equipment - Part 24: Headphones and earphones - Active acoustic noise cancelling characteristics

IEC 60268-24:2023 is applicable to active acoustic noise-cancelling headphones and earphones which have the function of reducing the noise heard by the user by the output sound from the transducer generated by the environment noise detection microphone and the noise reduction signal processing circuit.
This document specifies the terms and definitions of this type of headphones or earphones, the characteristics to be specified, and the measurement and evaluation methods.
The noise detection microphone or microphones are mounted in the body, on the surface, or on an accessory of the headphones or earphones. Signal processing circuits are analogue and digital electronic circuits.
This document does not deal with equipment intended for hearing protection.
The noise cancelling characteristic measurement methods can be applied to headphones and earphones having no active noise cancelling function.

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IEC 60268-23:2023 specifies acoustical measurement methods that apply to TV sets, monitors with built-in loudspeakers, and other audio devices having similar acoustical properties (e.g. flat-panel loudspeakers). The acoustical measurements are performed under free-field conditions and in-situ.
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Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index

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.

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Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index

IEC 60268-16:2011 specifies objective methods for rating the transmission quality of speech with respect to intelligibility. It provides a comprehensive manual for all types of users of the STI method in the fields of audio, communications and acoustics. Three methods are presented, which are closely related and are referred to as STI, STIPA, and STITEL. The first two methods are intended for rating speech transmission performance with or without sound systems. The STITEL method has more restricted uses. This fourth edition cancels and replaces the third edition, published in 2003, and constitutes a technical revision. It includes the following significant technical changes with respect to the previous edition:
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- the term STIr is discontinued. A new function for the prediction of auditory masking effects is introduced;
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Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index

Corrigendum 1: Equipements pour systèmes électroacoustiques - Partie 16: Évaluation objective de l'intelligibilité de la parole au moyen de l'indice de transmission de la parole

General Information

Relations

IEC 60268-16:2020/COR1:2025 - Corrigendum 1: Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index Released:7. 07. 2025

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