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 476–500 of 834 labs

Normec Valitech

Active
DAkkS D-K-18539-01-00 Falkensee, DE
Tensile testing of metallic materials (I positiver Überdruck -0,01 bar Absolutdruck p abs Taupunkttemperatur + 3 more
View Profile

Normec uppenkamp

Active
DAkkS D-PL-21203-01-00 Ahaus, DE
DIN EN 13725:2003-07 und Berichtigung DIN EN 16841-1 DIN EN 16841-2 DIN EN 61400-11 DIN EN ISO 11200 + 1 more
View Profile

Norsonic-Tippkemper

Active
DAkkS D-K-15132-01-00 Oelde, DE
Akustik Übertragungsmaß von Messmikrofonen Messmikrofonen mit Dämpfung eines + 3 more
View Profile

ONNEKEN Meß- und Prüftechnik

Active
DAkkS D-K-15218-01-00 Friedrichsdorf (Taunus), DE
Druck 0,03 bar Absolutdruck Pabs > -0,3 bar > 3,0 bar > −0,02 bar + 3 more
View Profile

OPTOLUTION Messtechnik

Active
DAkkS D-K-20427-01-00 Lörrach, DE
− Wärmezähler Durchflusssensoren als Teilgeräte von Wärme- und Kältezählern: + 3 more
View Profile

Ober Berg & Lukowiak

Active
DAkkS D-PL-12032-01-02 Hüllhorst, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847-4-3 IEC 61000-4-4: 2012 + 3 more
View Profile

Olfasense

Active
DAkkS D-PL-17433-01-00 Kiel, DE
DIN EN 13725:2003-07 und Berichtigung DIN ISO 16000-28 DIN EN ISO 16000-9 DIN EN ISO 16000-11 VDA 270
View Profile

Open Grid Europe GmbH Technologiezentrum Gasqualität

Active
DAkkS D-PL-14154-01-01 Essen, DE
ISO 6974-1 ISO 6974-2 ISO 6974-6 ISO 6975 DIN EN 12697-5 + 3 more
View Profile

OMPG

Active
DAkkS D-PL-11118-01-01 Rudolstadt, DE
DIN EN 1264-5 DIN EN 13647 DIN EN 71-10 DIN EN 50642 DIN EN ISO 14184-2 + 3 more
View Profile

PETROLAB GmbH Laboratorium für Mineralöl- und Umweltanalytik

Active
DAkkS D-PL-14361-01-01 Speyer, DE
DIN EN ISO 12185 ASTM D 4052 DIN EN ISO 3405 ASTM D 86 DIN EN 13016-1 + 3 more
View Profile

PHOENIX TESTLAB

Active
DAkkS D-PL-17186-01-01 Blomberg, 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

PMK - GmbH (Prüfen+Messen+Kalibrieren)

Active
DAkkS D-K-17519-01-01 Niestetal, DE
Parallelendmaße aus 0,5 mm Einstellringe aus Stahl * nach DIN EN ISO 3650:1999 Keramik * DIN EN ISO 3650:1999 + 3 more
View Profile

PPT

Active
DAkkS D-K-20121-01-01 Freiburg im Breisgau, DE
Kraft Zug- und Druckkraft 0,4 N·m Längenänderungsmessein Parallelendmaße * 0,5 mm + 3 more
View Profile

PROMESS Gesellschaft für Montage- und Prüfsysteme

Active
DAkkS D-K-21209-02-00 Berlin, DE
Railway brake — magnetic track brakes (U − Kraft (WPM) nur Vor-Ort-Kalibrierungen Kraft (WPM) 0,1 kN Vibration measuring instruments — test m + 3 more
View Profile

PTS - Institut für Fasern & Papier g

Active
DAkkS D-PL-23019-01-01 Heidenau, DE
rs11887534 HABP2-Gen (c.1601G>A) rs7080536 IEC 61924-2 DIN EN ISO 1974 DIN 53121 + 3 more
View Profile

PTW - Freiburg Physikalisch-Technische Werkstätten Pychlau

Active
DAkkS D-K-15059-01-00 Freiburg im Breisgau, DE
Dosimetrie Luftkerma 5 mGy 2 mGy 100 µGy + 3 more
View Profile

PZT

Active
DAkkS D-PL-12127-01-00 Wilhelmshaven, DE
DIN EN ISO 10256 prEN 50365 DIN EN ISO 21420 DIN EN ISO 3741 DIN EN ISO 13688 + 3 more
View Profile

Partnerschaftspraxis für Laboratoriumsmedizin und Mikrobiologie

Active
DAkkS D-ML-13116-01-01 Hameln, DE
Hämoglobin Selen Lithium Zink Eisen, Kupfer + 3 more
View Profile

Perschmann Calibration

Active
DAkkS D-K-15089-01-01 Braunschweig, DE
Parallelendmaße * 0,5 mm DIN EN ISO 3650:1999 > 100 mm Sonderquerschnitt (rund Parallelendmaße * > 100 mm + 3 more
View Profile

PfB GmbH & Co. Prüfzentrum für Bauelemente

Active
DAkkS D-PL-17012-01-00 Stephanskirchen, DE
DIN EN 1932 DIN EN 12179 DIN EN 12211 DIN EN 12444 ASTM E547-00 + 3 more
View Profile

Pharmaserv GmbH Kalibrierlabor

Active
DAkkS D-K-18321-01-00 Marburg, DE
Temperaturmessgrößen Widerstandsnormal thermometer (IPRT) Zeiss Industrielle Temperaturmessgrößen −35 °C + 3 more
View Profile

Phoenix Contact GmbH & Co. KG Laboratory Device Connectors

Active
DAkkS D-PL-12161-01-00 Blomberg, DE
IEC 61984 IEC 60998-1 IEC 60998-2-1 IEC 60998-2-2 IEC 60998-2-3 + 3 more
View Profile

Polytest Ingenieure

Active
DAkkS D-PL-21123-01-02 Fürth, DE
DIN EN ISO 9934-1 DIN ISO 815-1 DIN ISO 815-2 DIN ISO 4593 DIN EN 50178: 1998 + 3 more
View Profile

Power Diagnostix Systems

Active
DAkkS D-K-15068-01-00 Aachen, DE
Impulsladung Anstiegszeit Impulsdauer Wechselspannung 1 V > 1,1 kV + 3 more
View Profile

Praxis für Labormedizin, med. Thomas Müller

Active
DAkkS D-ML-13079-01-00 Aschaffenburg, DE
Differentialblutbild Erythrozyten Hämatokrit Leukozyten Retikulozyten + 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