What is STIPA?

How do you measure speech clarity in a space? STIPA stands for Speech Transmission Index for Public Address systems a reliable way to measure how intelligible speech is in a given environment.

It’s widely used in settings like train stations, airports, classrooms, and public buildings where clear communication is critical. STIPA works by sending a specially modulated test signal through the sound system and analysing how well that signal survives the journey through the room.

It considers factors like background noise, reverberation, and distortion, all of which affect how clearly we hear announcements.

In this video, we cover what STIPA is, how it’s tested, and why it’s a key part of acoustic design in public and safety-critical spaces. Want to understand more about speech intelligibility and acoustic testing? Visit the AcSoft Knowledge Hub for detailed guides, FAQs, and expert resources on all things sound.