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

Showing 126–150 of 834 labs

DAkkS D-K-18994-01-00 Pleidelsheim, DE
optische 0 mm Werkzeugeinstell- und / Messgeräte verwendete Abkürzungen:
View Profile
DAkkS D-PL-11061-02-02 Petersberg, DE
DIN 40633-2 DIN 40633-3 DIN 53482 DIN 72551-100 DIN 72551-6 + 3 more
View Profile

ELLAB

Active
DAkkS D-K-20746-01-00 Bockel, DE
Taupunkttemperatur Widerstandssensor –100 °C bis > 140 °C bis > 240 °C bis + 3 more
View Profile
DAkkS D-K-15099-01-01 Königslutter am Elm, DE
- Gleichspannung Messgeräte > 0,004 V > 0,33 V > 33 V > 330 V + 3 more
View Profile

EMCCons RASEK

Active
DAkkS D-K-12067-01-01 Unterleinleiter, DE
- Gleichspannung > 0,12 V Vorverstärker > 1,2 V > 12 V > 120 V + 3 more
View Profile
DAkkS D-K-21444-01-01 Niederstetten, DE
Railway brake — anti-slide device (UIC 5 Railway brake — magnetic track brakes (U Railway brakes — conditions for homologa Railway brakes — disc brake pads (UIC 54 − Durchfluss von Gasen + 3 more
View Profile
DAkkS D-PL-14613-01-03 Dresden, DE
DIN ISO 10381-5 DIN ISO 18400-102 DIN ISO 18400-104 DIN ISO 18400-105 DIN ISO 18400-203 + 3 more
View Profile
DAkkS D-K-18808-01-01 Wendlingen, DE
Sound intensity — scanning method (ISO 9 Härteprüfmaschinen Kraft einrichtungen * Vibration measuring instruments — test m + 3 more
View Profile

ETAS

Active
DAkkS D-K-19158-01-00 Stuttgart, DE
- Gleichspannung Quellen und Messgeräte > 1 mV bis > 10 mV bis > 100 mV bis > 10 V bis + 3 more
View Profile

EXcorLab

Active
DAkkS D-PL-19275-02-01 Obernburg, DE
DIN EN ISO 1135-4 EN ISO 1135-5 DIN EN ISO 10993-1 DIN EN ISO 8637-1 DIN EN ISO 7199 + 2 more
View Profile
DAkkS D-K-15203-01-01 Braunschweig, DE
Aktivität 20 Bq > 20 Bq Spezifische Aktivität radioaktiver Lösungen 20 Bq·g + 3 more
View Profile

Elektro Struß

Withdrawn
DAkkS D-K-15196-01-01 Nordenham, DE
Gleichspannung 30 mV / Messgeräte > 0,33 V > 3,3 V > 33 V + 3 more
View Profile
DAkkS D-K-20306-01-00 Weinstadt, DE
Taupunkttemperatur für Widerstands- ˃ 500 °C - Direktanzeigende Thermometer Thermoelemente ˃ 500 °C Widerstands- -50 °C + 3 more
View Profile
DAkkS D-K-15020-04-01 Norderstedt, DE
/ Messgeräte 0,001 V > 0,22 V > 2,2 V > 22 V + 3 more
View Profile
DAkkS D-K-15180-01-01 Wiesloch, DE
Elektrische Messgrößen Gleichstrom- und Niederfrequenzmessgröße Railway brake — magnetic track brakes (U − Gleichspannung − Gleichstromstärke + 3 more
View Profile

Elster

Active
DAkkS D-K-19495-01-01 Mainz-Kastel, DE
Durchfluss von Gasen 0,5 m³/h Volumendurchfluss > 4 m³/h Railway overhead lines — pantograph head > 10 m³/h + 3 more
View Profile
DAkkS D-PL-18838-02-01 Riedering, DE
DIN EN ISO 14607 DIN EN 13687-2 DIN EN ISO 15912 ASTM E290-22 DIN EN ISO 19023 + 3 more
View Profile
DAkkS D-PL-15172-01-00 Maulburg, DE
IEC 61000-4-2: 2008 IEC 61000-4-3: 2006 IEC 61000-4-4: 2012 IEC 61000-4-5: 2005 IEC 61000-4-6: 2013 + 3 more
View Profile
DAkkS D-PL-11054-01-00 Dresden, DE
CDC73 (NM_000384: c.1-c.82) ID152 EN ISO 11925-2 DIN EN 350 + 3 more
View Profile
DAkkS D-K-21247-01-01 Hemer, DE
Innen- und Tiefenmaße Konventioneller 0,11 G > 2 G > 5 g + 3 more
View Profile

Esenwein

Active
DAkkS D-K-15168-01-00 Hochdorf, DE
/ Messgeräte > 220 mV Quellen > 0,2 V 120 V 200 V + 3 more
View Profile
DAkkS D-ML-17481-01-01 Gelsenkirchen, DE
Thrombozytenfunktion Agomelatin Amisulprid (Psychopharmaka) Amitriptylin (TZA) Aripiprazol (Neuroleptika) + 3 more
View Profile
DAkkS D-ML-17480-01-01 Gelsenkirchen, DE
Thrombozytenfunktion Agomelatin Amisulprid (Psychopharmaka) Amitriptylin (TZA) Aripiprazol (Neuroleptika) + 3 more
View Profile
DAkkS D-PL-19438-01-00 Schwerte, DE
DIN EN 13141-4 DIN EN 13141-6 DIN EN 13141-7 DIN EN 13141-8 DIN EN 13141-11 + 3 more
View Profile
DAkkS D-ML-20007-01-00 Duisburg, DE
Glykohämoglobin A1C (HbA1c) Basophile Granulozyten Eosinophile Granulozyten Erythrozytenverteilungsbreite (RDW) + 3 more
View Profile

No matching labs found.

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

Other Test Methods

0 labs selected
Compare