Scope
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
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DIN EN ISO 3382-2
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BS EN ISO 3382-2
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NF EN ISO 3382-2
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UNI EN ISO 3382-2
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UNE EN ISO 3382-2
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NEN EN ISO 3382-2
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DIN EN ISO 1996-2
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BS EN ISO 1996-2
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NF EN ISO 1996-2
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UNI EN ISO 1996-2
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UNE EN ISO 1996-2
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NEN EN ISO 1996-2
1,670
Accredited labs
18
Countries
Showing 1,351–1,375 of 1,670 labs
UNE-EN ISO 868
ASTM D 2240
ISO 48-9
UNE 7050-3
UNE-EN ISO 10360-2
+ 3 more
UNE-EN 61672-3
UNE-EN 60651
UNE-EN 60804
UNE-EN 61252 (Técnica calibrador acústic
UNE-EN 60942
+ 3 more
TTR INSTITUTE SRL
Active
ASTM E 415 21
DIN EN 15266
ASTM D 1329
UNI EN ISO 22391
DIN EN ISO 10140-1
+ 3 more
TUV ITALIA SrL
Active
ETSI EN 301 489-1: V2.2.3
IEC 62109-1
DIN EN 50178: 1998
IEC 61000-4-16: 2015
IEC 62109-2
+ 3 more
TUV Rheinland Italia
Active
IEC 60335-2-51
DIN EN 60068-2-30
IEC 61000-6-1
IEC 60335-2-54: 2008
DIN EN 50564
+ 3 more
ISO 6529
DIN EN 13744
DIN EN 16523-1
EN 16523-2
ASTM F739-12e1( withdrawn)
+ 3 more
Technische Universität Darmstadt Staatliche Materialprüfungsanstalt Mess- und Kalibriertechnik
Active
Railway braking — thermal analysis (EN 1
Railway — traction effort and braking fo
Railway vehicle dynamics — on-track test
Railway brake disc acoustic emissions (E
Railway wheel squeal and curve noise (EN
+ 3 more
Technische Universität München Institut für Medizinische Mikrobiologie, Immunologie und Hygiene
Active
Staphylokokken
Treponema pallidum (Cardiolipin
Antikörper)
Legionella spp.
Salmonellen, Shigellen, Yersinia
+ 3 more
TechnoTeam Bildverarbeitung
Active
& 2: 2008
Leuchtdichte L /
vom Typ L3 Standard
Normfarbwertanteile x , y /
LED-basierte Farb- und
+ 3 more
Tecnolab del Lago Maggiore
Active
ISO 37
&10 based on HSG 248
BS EN ISO 6509-1:2014
ISO 815-1
ISO 815-2
+ 3 more
Taupunkttemperatur
Railway braking — urban guided transport
Widerstandssensor
–40 °C bis
> 5 °C bis
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TesT
Active
Kraftaufnehmer und
Kraft (WPM) *
Vibration measuring instruments — test m
maschinen nach DIN
Acoustics — tonality assessment (DIN 456
+ 3 more
Gleichspannung 0 mV
Messgeräte 10 mV
Wechselspannung 0,22 mV
> 220 mV
> 2,2 V
+ 3 more
Test-Fuchs, Fritz Fuchs Gesellschaft mit beschränkter Haftung Kalibrierlaboratorium Deutschland
Active
Positiver Überdruck p e
> 70 bar
Überdruck p
(ein- oder mehrgängige
Testo Industrial Services
Active
- Gleichspannung
/ Messgeräte
Quellen
Hochspannung
- Gleichstromstärke
+ 3 more
Testo Industrial Services
Active
RELATIVE HUMIDITY
HUMIDITY continued
loggers
Gas Pressure Gauge
Saturated salt capsules
+ 2 more
Testzentrum Baden
Active
DIN EN 60068-2-67
UNE-EN 60068-2-52
IEC/EN 60068-2-38:2009 Part 2-38:
ISO 16750-4
DIN EN 60529
+ 3 more
Tetra Tech Consulting
Active
(HSG 248) – 2021
RPSCA1 based on HSG 248
(PCM) based on HSG 248
RPSCA2 based on HSG 248
BS 7592:2008, BS 8554:2015
+ 2 more
TetraTec Instruments
Active
Railway brakes — disc brake pads (UIC 54
Volumendurchfluss bzw.
0,01 m
Railway pantographs — requirements for m
39 mL/h
+ 3 more
No matching labs found.