Speech 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 326–350 of 834 labs
Labor Mainz MVZ
ActiveLabor an der Salzbrücke MVZ
ActiveLaborZentrum Weser Franz-Josef Schmitz
SuspendedLaborarztpraxis Osnabrück
ActiveLaborarztpraxis Osnabrück e
ActiveLaborgemeinschaft Köln
ActiveLaborgemeinschaft Odenwald
ActiveLaborärzte Sindelfingen
ActiveLatzke Härteprüfung
ActiveLeadec BV &
ActiveLudwig Schneider Messtechnik
ActiveMBS
ActiveMDI Limbach Berlin
ActiveNo matching labs found.