Standards
STI has gained international acceptance as the quantifier of channel influence on speech intelligibility. The International Electrotechnical Commission Objective rating of speech intelligibility by speech transmission index, as prepared by the TC 100 Technical Committee, defines the international standard.
Further the following standards have, as part of the requirements to be fulfilled, integrated testing the STI and realisation of a minimal speech transmission index:
- International Organization for Standardization (ISO) standard for sound system loudspeakers in Fire detection and fire alarm systems
- National Fire Protection Association Alarm Code
- British Standards Institution Fire detection and alarm systems for buildings
- German Institute for Standardization Sound Systems for Emergency Purposes
Read more about this topic: Speech Transmission Index
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