DS/EN 60268-16:2011

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

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This part of IEC 60268 specifies objective methods for rating the transmission quality of speech with respect to intelligibility.
The objective of this standard is to provide a comprehensive manual for all types of users of the STI method in the fields of audio, communications and acoustics.
This standard does not provide STI criteria for certification of transmission channels (e.g. criteria for a voice-alarm system).
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.
NOTE – None of the methods are suitable for the measurement and assessment of speech privacy and speech masking systems, as STI has not been validated for conditions that represent speech privacy applications [1]1.
The following information is included:
• measurement techniques;
• prediction techniques.

Number of pages: 80

Published: 2011-12-17

Date of approval: 2011-10-07

International relationships : EN 60268-16:2011 IDT IEC 60268-16:2011 IDT

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

Item number: M245891



  • CLC/SR 100
  • IEC/TC 100

Danish committee