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 801–825 of 1,868 labs

Instrument Repairs and Calibration

Active
UKAS 4688 East Kilbride, GB
DC Resistance AC VOLTAGE (continued) AC POWER AC CURRENT Generation (continued) + 3 more
View Profile

Intek

Active
ACCREDIA 00855 Rezzato, IT
DIN EN 60068-2-30 IEC 62080 IEC 61000-6-1 IEC 61000-6-2: 2005 DIN EN 61010-1 + 3 more
View Profile

Intertek Caleb Brett GERMANY

Active
DAkkS D-PL-11307-01-00 Hamburg, DE
DIN EN ISO 12185 ASTM D 4052 DIN EN ISO 3405 ASTM D 86 DIN EN 13016-1 + 3 more
View Profile

Intertek Consumer Goods

Active
DAkkS D-PL-14184-01-02 Fürth, DE
IEC 62321-2 DIN EN 61340-4-4 DIN EN 12472 DIN EN 16711-1 DIN EN 1264-5 + 3 more
View Profile

Intertek Deutschland

Active
DAkkS D-PL-12085-01-01 Kaufbeuren, DE
IEC 61000-3-2: 2014 IEC 61000-3-3 IEC 61000-3-11: 2017 IEC 61000-3-12: 2011 IEC 61000-4-2: 2008 + 3 more
View Profile

Intertek Polychemlab

Active
RvA L377 Geleen, NL
DIN EN ISO 10675-1 DIN EN ISO 19458 DIN EN ISO 179-1 NEN 6953 DIN EN ISO 10675-2 + 3 more
View Profile

Intona

Active
UKAS 10273 Dundee, GB
and Appx. 3 of HSG 227 (2004)) Executive guides HSG 264 (2012) (HSG 264, 2012)
View Profile

Isserstedt Prüfmaschinen

Active
DAkkS D-K-15061-01-00 Nettetal, DE
Härte* 20 HRA Härtevergleichsplatten 20 HRB 20 HRC 40 HRD + 3 more
View Profile

Istituto Giordano SpA

Active
ACCREDIA 00019 Bellaria-Igea Marina, IT
EN 14304:2009+A1:2013 EN 14305:2009+A1:2013 DIN EN ISO 12623 DIN EN 1873 DIN EN 14963 + 3 more
View Profile

J B-Monitor

Active
UKAS 2075 Colwyn Bay, GB
(HSG 248) – 2021 No 1 based on HSG 248 – 2021 (PCM) based on HSG 248 – 2021 No 3 based on HSG 248 – 2021 (PCM) based on HSG 248 + 1 more
View Profile

J.P. ALCARAZ ELECTRONICA

Active
ENAC LC10.259 Cartagena, ES
CEM EL-014 CEM EL CEM EL-001 CEM ME
View Profile

JCS Technology

Active
UKAS 2154 Weston-super-Mare, GB
ISO 178 BS 5350:Part C13 BS 2782 Part 10 Method 1005 BS EN ISO 14125 MIL-STD 810G:2008 Method 501.5 + 3 more
View Profile

JOMA INGENIERÍA Y MONTAJES

Active
ENAC LE1644 Paterna, ES
UNE-EN ISO 16283-1 UNE-EN ISO 16283-3 UNE-EN ISO 16283-2
View Profile

JTSEC BEYOND IT SECURITY, S.L. (Unipersonal)

Active
ENAC LE2505 Granada, ES
UNE 320001 ISO/IEC 18045 ISO/IEC 15408 CEM ISO ISO/IEC 24759 + 2 more
View Profile

Jackson and Keay

Active
UKAS 0027 Colwick, GB
BS EN ISO 11623:2015 BS EN ISO 18119:2018+A1:2021 BS EN ISO 10460:2018 BS EN 20745:2020
View Profile

Janner Waagen GmbH Zweigniederlassung Weiden

Active
DAkkS D-K-21494-01-00 Weiden i. d. OPf., DE
Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO elektronische Waagen Innen- und Tiefenmaße Konventioneller + 2 more
View Profile

Javer Labs

Active
UKAS 31736 Nottingham, GB
MIL-STD-810G, Method 508:7 BS 2011:2.1 Ca:1977 (IEC 60068-2-10:2005+A1:2018, MIL-STD-810H, Method 508:8
View Profile

Johann Fischer Aschaffenburg Präzisionswerk

Active
DAkkS D-K-18423-01-00 Aschaffenburg, DE
Ebenheitsabweichung verkörperungen z.B. platten nach DIN 876:1984 Geradheitsabweichung ebener Flächen, z.B. + 3 more
View Profile

Johnson and Allen

Active
UKAS 4168 Smithfield, GB
DC CURRENT INSPECTION EQUIPMENT AC CURRENT 50 Hz RMS uncertainties may be increased.
View Profile

Johs. Boss

Active
DAkkS D-K-21417-01-00 Albstadt, DE
(ein- und mehrgängige winde mit geradlinigen unsymmetrischem Profil 0,5 mm bis 6 mm) Außengewinde Nenndurchmesser + 3 more
View Profile

Jordan Design and Development Bureau

Active
UKAS 4515 Amman 11190, JO
MIL-PRF-46103E DIN EN ISO 15106-3 DIN EN ISO 1522 DIN EN ISO 1523 ISO 16935:2007 + 3 more
View Profile

Julius-Maximilians-Universität Würzburg Institut für Hygiene und Mikrobiologie

Active
DAkkS D-ML-13135-01-00 Würzburg, DE
Obligat anaerobe Bakterien mikroaerophile Bakterien ESBL-Bildner (multiresistente gramnegative säurefeste Stäbchen + 3 more
View Profile

Julius-Maximilians-Universität Würzburg Institut für Virologie und Immunbiologie

Active
DAkkS D-ML-13135-03-01 Würzburg, DE
CD45 Percp+CD16+56+CD3 CD4 CD45 Percp+CD4+CD8 Adalimumab Anti-Adalimumab Antikörper + 3 more
View Profile

Jurjanz

Active
DAkkS D-K-15085-01-01 Schkeuditz, DE
Parallelendmaße aus 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße aus > 100 mm Messschieber für 1350 mm + 3 more
View Profile

K B Calibration Services

Active
UKAS 4630 East Sussex, GB
LENGTH ended (excluding length bars) Chronic progressive external Dial gauges and dial test Caliper Gauges + 1 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