ScopeSpeech Transmission Index Measurement
This test method provides an objective measure of speech intelligibility in acoustic environments using the Speech Transmission Index (STI) method. STI quantifies how well speech is transmitted through an acoustic space, accounting for noise, reverberation, and frequency distortion. The measurement is critical for evaluating communication effectiveness in public address systems, conference rooms, classrooms, and other speech-critical environments. Venues with high standards for speech clarity use this method to verify system performance and acoustic suitability. ISO 17025 accreditation ensures reliable assessment of speech intelligibility compliance with design standards.
What it measures
- Speech Transmission Index (STI) value (0-1 scale)
- Modulation transfer function across frequency bands
- Speech intelligibility rating and quality assessment
- Impact of noise and reverberation on speech clarity
- Communication effectiveness and auditory conditions
Showing 1,751–1,775 of 1,868 labs
VWR International
ActiveVectoflow
ActiveVintec Laboratories
ActiveVistec Electron Beam
ActiveWENZEL Metrology
ActiveWIKA Alexander Wiegand SE &
ActiveWIN Messmittel und Service
ActiveWINDTEST Grevenbroich
ActiveWSP UK
ActiveNo matching labs found.