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
🇮🇹
UNI EN ISO 1996-2
🇪🇸
UNE EN ISO 1996-2
🇳🇱
NEN EN ISO 1996-2
1,868
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20
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Showing 1,526–1,550 of 1,868 labs
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ASTM F739-12e1( withdrawn)
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Technische Universität Darmstadt Staatliche Materialprüfungsanstalt Mess- und Kalibriertechnik
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Railway braking — thermal analysis (EN 1
Railway — traction effort and braking fo
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Railway brake disc acoustic emissions (E
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Technische Universität München Institut für Medizinische Mikrobiologie, Immunologie und Hygiene
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Staphylokokken
Treponema pallidum (Cardiolipin
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Legionella spp.
Salmonellen, Shigellen, Yersinia
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ISO 15835-2
DIN EN ISO 6506-1
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IEC 62301
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TechnoTeam Bildverarbeitung
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& 2: 2008
Leuchtdichte L /
vom Typ L3 Standard
Normfarbwertanteile x , y /
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ISO 3727-1/IDF 80-1:2001
ISO 5534/IDF 4:2004
ISO 6731/IDF 21:2010
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Tecnolab del Lago Maggiore
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ISO 37
&10 based on HSG 248
BS EN ISO 6509-1:2014
ISO 815-1
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Taupunkttemperatur
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–40 °C bis
> 5 °C bis
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TesT
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Kraftaufnehmer und
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maschinen nach DIN
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Gleichspannung 0 mV
Messgeräte 10 mV
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Volumendurchfluss bzw.
0,01 m
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The Auditing Company
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#EN ISO 5164:14
# EN 116-97
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NEN 4400-1
#ISO 6618
DC CURRENT
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