IEC 60268-16:2011

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
🇩🇪 DIN EN ISO 3382-2 🇬🇧 BS EN ISO 3382-2 🇫🇷 NF EN ISO 3382-2 🇮🇹 UNI EN ISO 3382-2 🇪🇸 UNE EN ISO 3382-2 🇳🇱 NEN EN ISO 3382-2 🇩🇪 DIN EN ISO 1996-2 🇬🇧 BS EN ISO 1996-2 🇫🇷 NF EN ISO 1996-2 🇮🇹 UNI EN ISO 1996-2 🇪🇸 UNE EN ISO 1996-2 🇳🇱 NEN EN ISO 1996-2
1,670 Accredited labs
18 Countries

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DAkkS D-ML-13295-04-00 München, DE
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Lamotrigin AFP HbA1c CA 125 AMH + 3 more
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Kleines Blutbild Differentialblutbild maschinell C-reaktives Protein (CRP) Differentialblutbild manuell Urinstatus + 3 more
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DAkkS D-ML-13295-03-00 München, DE
17-OH-Progesteron ACTH Androstendion Aldosteron Anti-TG Antikörper + 3 more
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DAkkS D-ML-13421-01-00 Ludwigshafen, DE
Liste aller Untersuchungsverfahren Webpräsenz des Medizinischen Laboratoriu CDT Ampicilin Cefepim + 3 more
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Rhythmusstörungen (ABCC9, AKAP9, ANK2,TT MSH2, MSH6, MUTYH, PMS2, PTEN, RAD51C, R Familiärer Brust- und Eierstockkrebs MSH2, MSH6, EPCAM ); SNV, CNV Birt-Hogg-Dubé-Syndrom (FLCN + 3 more
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DAkkS D-ML-13400-01-00 Groß Grönau, DE
AMA M2-3E IgG Anti-CCP (Cyclische Citrullin Antikörper) IgG Anti-dsDNS-NCX IgG Anti- Transglutaminase + 3 more
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DAkkS D-K-17518-01-01 Remscheid, DE
abweichungen Metrosoft CM und Messvolumen Metrosoft QUARTIS, mit einer Software der Fa. WENZEL Raumdiagonale Metromec Chur, CH von ≤ 4666 mm
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DAkkS D-K-15098-01-01 Leonberg, DE
Software von WENZEL einer Raumdiagonalen Messprojektoren einer Raumdiagonalen Koordinatenmessgeräte geräte mit einem Messmikroskope ≤ 600 mm Auswertesoftware Messvolumen mit + 2 more
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DAkkS D-K-15077-01-00 Aschaffenburg, DE
Parallelendmaße 0,5 mm bis DIN EN ISO 3650:1999 Parallelendmaße aus 0,5 mm bis Keramik oder Wolframkarbid nach + 3 more
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DAkkS D-K-22877-01-01 Eschweiler, DE
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UKAS 23015 Mansfield, GB
and Appendix 3 of HSG 227 (2004)) Appendix 5 of HSG 227 (2004))
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DAkkS D-PL-22819-01-00 Lüdenscheid, DE
DIN 40050-9 IEC 60068-2-2 IEC 60068-2-6 DIN EN IEC 60068-2-13 DIN EN 60068-2-14 + 3 more
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UKAS 7736 Chelmsford, GB
(HSG 248) – 2021 (PCM) based on HSG 248 SAS 02 based on HSG 248
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Kovia

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UKAS 9942 Royal William Yard, GB
Appendix 5 of HSG 227 (2004)) HSG 227 (2004) HSG 264 (2012) and Appendix 3 of
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DAkkS D-ML-13173-01-00 Bad Oeynhausen, DE
Thrombozytenfunktion Amiodaron/Desethylamiodaron Cotinin Cyclosporin A Everolimus + 3 more
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DAkkS D-ML-21357-01-00 Heppenheim, DE
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DAkkS D-PL-19181-01-00 Winnenden, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN EN 13487 DIN 45635-46 + 2 more
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DAkkS D-K-15009-01-01 Leipzig, DE
Eindringkörper für 75° Sound system equipment — speech transmis Länge der Schnittlinien * Vergrößerungsnormale Abflachung bis 300 + 3 more
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DAkkS D-K-15082-01-00 Hamburg, DE
Durchfluss von Gasen 17 mL/s transferstandards Strömungswiderstand 5 mL/min 15,0 mL/min Laminar Flow Elemente 17 mL/min + 3 more
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DAkkS D-PL-22893-01-00 Rheine, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN EN 61400-11 ISO 9613-2
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DAkkS D-K-17059-02-01 Dresden, DE
Messschieber für Außen-, 0 mm Innen- und Tiefenmaße > 300 mm Tiefenmessschieber 0 mm Höhenmessschieber 0 mm + 3 more
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LAB (UK)

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UKAS 0671 Basildon, GB
(HSG 248) – 2021 (PCM) based on HSG 248 MAAM 05 based on HSG 248 (HSG 264, 2012)
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LABACUSTIC

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ENAC LE1438 Vall d Uixó, ES
UNE-EN ISO 140-5 UNE-EN ISO 16283-3 UNE-EN ISO 16283-2 UNE-EN ISO 140-7 UNE-EN ISO 16283-1 + 1 more
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ENAC LE285 Alacant, ES
UNE-EN ISO 27888 SM 2540 UNE-EN ISO 8467 UNE-EN ISO 7027-1 UNE-EN ISO 10523 + 3 more
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Industries

Audio and sound system design Public address and emergency systems Telecommunications and broadcasting Educational and institutional facilities Aviation and maritime communication

Related Standards

  • ISO 3382-2 Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms
  • ISO 1996-2 Acoustics - Description, measurement and assessment of environmental noise - Part 2: Determination of sound pressure levels
  • EN 60268-1 Sound system equipment - Part 1: General

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