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
1,868 Accredited labs
20 Countries

Showing 1,226–1,250 of 1,868 labs

North Star Environmental

Active
UKAS 7691 Shotton, GB
(HSG 248) – 2021 NSDOC 47 based on HSG 248 staining based on HSG 248. (PCM) based on HSG 248
View Profile

Not One Iota

Active
UKAS 8998 Portadown, GB
(HSG 248) – 2021 SOP-12, based on HSG 248 staining based on HSG 248 (PCM) based on HSG 248
View Profile

Nuclear Restoration Services

Active
UKAS 0573 Thurso, GB
AIR KERMA RATE AMBIENT DOSE HBs-Antigen (Hepatitis B-Surface RESPONSE: PERSONEL DOSE
View Profile

O.C. Consulting (UK)

Active
UKAS 0282 Harlow, GB
(HSG 264, 2012) Appendix 5 of HSG 227 (2004) (HSG 248) – 2021 (PCM) based on HSG 248
View Profile

OCA INSPECCIÓN, CONTROL Y PREVENCIÓN, S.A. (Unipersonal) (OCA GLOBAL)

Active
ENAC LE2316 Pozuelo de Alarcón, ES
UNE-EN 14385 UNE-EN 15259 UNE-EN 13211 BS ISO 9096:2017 UNE 77216 + 3 more
View Profile

ODOURNET France - SENSENET

Active
COFRAC 1-1964 Cesson-Sevigne, FR
DIN EN 13725:2003-07 und Berichtigung
View Profile

OHEC (uk)

Active
UKAS 0394 Prestwich, GB
(HSG 264, 2012) Appendix 5 of HSG 227 (2004))
View Profile

OHS

Active
UKAS 21882 Manchester, GB
(HSG 264, 2012)
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

ORANO MINING CIME (Centre d'Innovation en Métallurgie Extractive)

Active
COFRAC 1-5873 Bessines-Sur-Gartempe, FR
DIN EN ISO 11731 2019-03 EN 13087-2 NF T 90-043 NF-T 90-101 NF T90-015-1 + 3 more
View Profile

OTECH Environnement

Active
COFRAC 1-5809 Bruay La Buissiere, FR
DIN EN 27888 NF X 31-615 (Uniquement DIN EN ISO 10523
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

Oelze Präzisions-Meßzeugfabrik

Active
DAkkS D-K-15021-01-01 Aschaffenburg, DE
Railway brake — magnetic track brakes (U − Ebenheit − Geradheit − Winkelnormale auch als Vor-Ort-Kalibrierung + 3 more
View Profile

Offshore Renewable Energy Catapult

Active
UKAS 2769 Blyth, GB
IEC 61400-23 ASTM G73 (2012) IEC 60885-3, 2.4.1 IEC 60502-2 IEC 60840 + 3 more
View Profile

Olfasense

Active
RvA L403 Amsterdam, NL
DIN EN ISO 16911-1 ISO 10780 DIN EN 13725:2003-07 und Berichtigung AG2 and IS EN 15259:2007
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

Olfasense UK

Active
UKAS 2430 Bristol, GB
IEC 60519-11 BS EN BS EN ISO 21877:2019 DIN EN ISO 16911-1 Standard and BS EN 15259:2007 DIN EN 13126-19 + 3 more
View Profile

Omgevingsdienst Midden- en West-Brabant

Active
RvA I073 Tilburg, NL
ISO 11819-1 (N 2 O) 0,000008 DIN EN ISO 16911-1 AG2 and IS EN 15259:2007 DIN EN 14790 + 3 more
View Profile

Omgevingsdienst Regio Arnhem (ODRA)

Active
RvA I168 Arnhem, NL
ETSI EN 301 489-1 V2.2.3 2019-11 ASTM D4157-13 BS ISO 11338-1:2003 DIN EN ISO 16911-1 NEN-EN 14791 2 + 3 more
View Profile

One Scientific

Active
UKAS 2048 Avonmouth, GB
ISO 6888-1 ISO 21528-2 BS ISO 4832:2006 ISO 4833-1 ISO 6579-1 + 3 more
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

Optical Test & Calibration

Active
UKAS 0286 Bradford, GB
DC Resistance DC CURRENT DC VOLTAGE DC RESISTANCE (cont’d)
View Profile

Oracle Solutions Asbestos

Active
UKAS 4600 Kettering, GB
(HSG 264, 2012)
View Profile

Ostthüringische Materialprüfgesellschaft für Textil und Kunststoffe mbH Rudolstadt (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

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