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
1,868
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K. A. Schmersal
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DIN EN IEC 60947-5
IEC 60947-5-1
IEC 60947-5-2
DIN EN 60947-5
IEC 60947-5-3
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KB Prüftechnik
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Härteprüfmaschinen nach 100 HBW
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226 HBW
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basophile, eosinophile, Granulozyten
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KOLLMORGEN Europe
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IEC 61000-4-2: 2008
VDE 0847-4-2
IEC 61000-4-4: 2012
VDE 0847-4-4
IEC 61000-4-5: 2005
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KP Acoustics Research Labs
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BS EN ISO 10140-2:2021
ISO 3745
ISO 7171
IEC 60601-1
accordance with BS EN ISO 5349-1
KRIWAN Testzentrum
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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
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KSW Kalibrierservice
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Gleichspannung 100 µV
Messgeräte 220 mV
> 2,2 V
> 11 V
> 22 V
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Kalibra International
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HCS LF 6 0
HCS LF 2 0
HCS LF 6 2
HCS LF 1 0
HCS LF 3 0
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Kapraun Prüfdienst
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Railway brake — magnetic track brakes (U
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auch als Vor-Ort-Kalibrierung
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DIN EN 60034-15
VDE 0530-15
IEC 60034-15
DIN EN 60044-7
VDE 0414-44-7
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Kern & Sohn
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nichtselbsttätige
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Kessler QMP
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Parallelendmaße * 0,5 mm
DIN EN ISO 3650:1999
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Railway maintenance — track geometry (EN
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Kistner Metrologie Service
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Parallelendmaße * 0,5 mm
DIN EN ISO 3650:1999
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Kiwa Assurance
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EN ISO 11925-2
DIN EN ISO 13162
DIN EN 14509
DIN EN ISO 13163
DIN EN 1604
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DIN EN ISO 18203
ASTM B557-15
UNI 1567
ISO 15874
DIN EN ISO 10140-1
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Kiwa
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DIN EN 13079
BS 1212-4:1991 Clause 4, 13, 14
DIN EN 14622
BS 1212-3:1990 Clause 4
DIN EN 14623
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Kiwa
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DIN EN 55011: 2018
IEC/CISPR 22
DIN EN 55016-2-1
IEC 61326-2-2: 2012
IEC 61000-6-1
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Kiwa
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DIN EN 16510-2-3
DIN EN 16510-2-1
DIN EN 13229
DIN EN 16510-1
DIN EN 13240
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