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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AC Environnement
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NF ISO 21438-3
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ACEPE
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DIN EN 17126
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DIN EN 13727
DIN EN ISO 11930
DIN EN 14476
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DIN EN 1149-2
DIN 53742
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ASTM D 2863
c.1772A>G rs11568367
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ACOUSTICS ANALYSIS
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UNE-EN ISO 16283-2
UNE-EN ISO 16283-3
UNE-EN ISO 140-7
UNE-EN ISO 16283-1
UNE-EN ISO 140-4
(HSG 264, 2012)
HSG 227 (2004)
(HSG 248) – 2021
(PCM) based on HSG 248
DIN EN 12102-1
DIN EN 14511-3
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DIN EN ISO 3741
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UNE-EN ISO 16283-3
UNE-EN ISO 3382-2
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UNE-EN ISO 16283-2
UNE-EN ISO 10140-2
UNE-EN ISO 10140-2 0
ISO 2631-2
UNE-EN ISO 16283-1
UNE-EN ISO 10140-1
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AD-LAB - Brussieu
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NF X 43-269
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ISO 16000-7
ADOUR BIO CONSEIL - A.BIO.C.
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0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN ISO 16649-2
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DIN ISO 11665-4
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UNE 10523
UNE 27888
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ISO 15923-1
SM 3500
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ISO 22964
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NF EN 12469 Annexe H pour PSM
NF X 44-201 (Octobre 1984) pour PSM
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SM 3111
SM 5220 D
SM 2130 B
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SM 2510 B
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EPA 6020
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DIN ISO 10381-5
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DIN ISO 18400-203
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SM 2540 F
SM 2130 B
EPA 8270
UNE-EN ISO 8467
UNE-EN ISO 5815-1
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