Articles tagged “modulation transfer function”
2 articles covering modulation transfer function in acoustic engineering and building design.
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PILLAR14 min readFeatured
Speech Transmission Index (STI) — The Complete Technical Reference
The definitive technical reference for STI (Speech Transmission Index) covering MTF theory, the full 98-point calculation method per IEC 60268-16:2020, STIPA and RASTI simplified methods, the CIS intelligibility scale, measurement equipment and methodology, STI targets by room type, and the relationship between RT60, background noise, and speech intelligibility.
March 14, 2026
STI complete guidespeech transmission index
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STANDARDS20 min read
IEC 60268-16 Complete Guide: Speech Transmission Index (STI) Standard
IEC 60268-16:2020 defines the Speech Transmission Index — the definitive metric for speech intelligibility in rooms. Here is every aspect of the standard explained: the STI calculation method, STIPA measurement procedure, quality scale, and how building codes worldwide use it.
March 14, 2026
IEC 60268-16STI