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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VDE 0468-2-1
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DIN EN IEC 60068-2-11
DIN EN IEC 60068-2-13
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optische 0 mm
Werkzeugeinstell- und
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verwendete Abkürzungen:
DIN EN ISO 17294-2
DIN EN ISO 7899-1
ISO 5815-1
NF T90-015-1
DIN EN ISO 10523
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EPA 3535
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DIN EN ISO 9308-2
EPA 5035
DIN EN 14789
EPA 5030
DIN EN 14790
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DIN 40633-2
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DIN 53482
DIN 72551-100
DIN 72551-6
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EDISON NEXT ENVIRONMENT
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DIN EN 14790
ISO 5667-5
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ISO 5667-11
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BS EN ISO 16283-1:2014+A1:2017BS EN ISO
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BS EN ISO 140-4:1998
ISO 1407
BS EN ISO 9972:2015
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and Appx. 3 of HSG 227 (2004))
in Appendix 5 of HSG 227 (2004)
guides HSG 264 (2012) and
(HSG 264, 2012)
EFFICIENCE ET OPTIMISATION
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NF ISO 21438-3
NF X 43-264
NF ISO 21438-1
NF X 43-259
NF ISO 21438-2
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EGIS INDUSTRIE ET PROCESS
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NF S 90-351
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ISO 14644-3
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NF X 43-269 - Annexe K
NF X 43-050 (parties utiles
NF X 46-032
NF X 43-269 – Annexe K
NF X 43-050
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ELANOVA LAB
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DIN ISO 1817
DIN EN 15188
DIN ISO 1431-1
DIN EN 14671
DIN EN ISO 10140-2
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ELMTEC Ingenieurgesellschaft
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- Gleichspannung
Messgeräte > 0,004 V
> 0,33 V
> 33 V
> 330 V
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IEC 61000-4-2: 2008
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IEC 61000-4-4: 2012
IEC 61000-4-5: 2005
IEC 61000-4-6: 2013
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EMCCons RASEK
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- Gleichspannung
> 0,12 V
Vorverstärker > 1,2 V
> 12 V
> 120 V
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ENSATEC, S.L. (Unipersonal)
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UNE-EN 12211
UNE-EN 12210
UNE-EN 1026
UNE-EN 12207
UNE-EN 14608
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Environmental noise — determination of s
ISO 20906 : 2009-12 :
EOLIA
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DIN EN 12469
NF S 90-351
NF X 44-201 (Octobre 1984) pour PSM
BS EN ISO 14644-1:2015
ISO 14644-3
Railway brake — anti-slide device (UIC 5
Railway brake — magnetic track brakes (U
Railway brakes — conditions for homologa
Railway brakes — disc brake pads (UIC 54
− Durchfluss von Gasen
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EPTA NORD
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DIN CEN ISO 15216-2
ISO 19250
AOAC 2012.01 2016
DIN EN ISO 15587-1
EPA 300.1 1997
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UNE-EN 12350-2
UNE-EN 12504-1
UNE-EN 12390-2
UNE-EN 12390-3
UNE-EN 12350-1
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UNE-EN ISO 16283-1
UNE-EN ISO 16283-2
UNE-EN ISO 16283-3
UNE 74201
UNE-EN ISO 3382-2
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