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
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Obligat anaerobe Bakterien
Grampositive aerobe und
anaerobe Kokken
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Mikrokokken
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automatische Zelldifferenzierung
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DIN EN ISO 3650:1999
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Messschieber für Außen-, 0 mm
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BS EN 14876:2007/Internal proceduresDiss
BS EN ISO 18119:2018+A1:2021
BS EN ISO 22434:2011
BS EN ISO 10460:2018
BS EN ISO 13769:2018
tungsten carbide)
Plain ring gauges (taper)
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Metrosoft CM, Software einer Raumdiagona
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Microtech Gefell
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ISO 7251
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ISO 6888-3
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ASTM B212-21
ASTM E1019-24
ASTM B527-24
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ASTM B417-22
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ETSI EN 319 412
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ETSI EN 319 411-2
ETSI EN 319 411-1
Ministry of Defence
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Specific Values
Specific values (continued)
ELECTRICAL
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AC CURRENT
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Mitutoyo Deutschland
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Parallelendmaße 0,5 mm
DIN EN ISO 3650:1999
Parallelendmaße
> 10 mm
Parallelendmaße > 100 mm
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Mobiler Kalibrierdienst Fini
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Gleichspannung 3 mV
Messgeräte 10 mV
> 100 mV
> 220 mV
> 11 V
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IEC 61000-4-7
IEC 61000-4-15
IEC 61000-4-30
IEC 61400-21
IEC 61400-21-1
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Temperatur 50 °C
Railway brake handbooks (UIC 547)
1) In den CMC sind die erweiterten Messu
Moorcroft Controls
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DC CURRENT
Gas pressure (gauge)
ELECTRICAL
DC VOLTAGE
Measurement
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IEC 61000-4-2: 2008
VDE 0847-4-2
IEC 61000-4-3: 2006
VDE 0847-4-3
IEC 61000-4-4: 2012
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