Articles tagged “stipa”
7 articles covering stipa in acoustic engineering and building design.
IEC 60268-16: Measuring Speech Intelligibility (STI/STIPA)
A practical guide to IEC 60268-16 speech intelligibility measurement — STI and STIPA methods explained, equipment requirements, field measurement procedures, and common interpretation errors.
Speech Transmission Index (STI): What It Is and Why Your Building Might Fail
Learn how Speech Transmission Index (STI) is calculated per IEC 60268-16, why buildings fail speech intelligibility tests, and how to fix poor STI scores.
How is STI Measured?
STI (Speech Transmission Index) is measured using modulation transfer functions derived from impulse responses or STIPA test signals. Learn the full-band and STIPA methods per IEC 60268-16.
What is Speech Intelligibility? The Science of Being Understood
Speech intelligibility measures how well listeners understand spoken words in a space. Learn about STI, STIPA, the factors that affect it, and the standards that define acceptable levels.
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.
What Is STI (Speech Transmission Index) — Can People Actually Understand Speech in Your Room?
STI measures how much a room degrades speech from source to listener, on a scale from 0 (unintelligible) to 1 (perfect). An STI below 0.50 means one in four words is lost. Here is how STI works, what scores you need, and why reverberation time alone is not enough.
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.