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
🇩🇪
DIN EN ISO 3382-2
🇬🇧
BS EN ISO 3382-2
🇫🇷
NF EN ISO 3382-2
🇮🇹
UNI EN ISO 3382-2
🇪🇸
UNE EN ISO 3382-2
🇳🇱
NEN EN ISO 3382-2
🇩🇪
DIN EN ISO 1996-2
🇬🇧
BS EN ISO 1996-2
🇫🇷
NF EN ISO 1996-2
🇮🇹
UNI EN ISO 1996-2
🇪🇸
UNE EN ISO 1996-2
🇳🇱
NEN EN ISO 1996-2
1,868
Accredited labs
20
Countries
Showing 876–900 of 1,868 labs
Kovia
Active
Appendix 5 of HSG 227 (2004))
HSG 227 (2004)
HSG 264 (2012) and Appendix 3 of
Thrombozytenfunktion
Amiodaron/Desethylamiodaron
Cotinin
Cyclosporin A
Everolimus
+ 3 more
Albumin
Alkohol
ALP
Anti-Faktor Xa (Fragmin)
AT3
+ 3 more
DIN 4150-1
DIN 4150-2
DIN 4150-3
DIN EN 13487
DIN 45635-46
+ 2 more
Eindringkörper für 75°
Sound system equipment — speech transmis
Länge der
Schnittlinien *
Vergrößerungsnormale Abflachung bis 300
+ 3 more
Durchfluss von Gasen 17 mL/s
transferstandards
Strömungswiderstand 5 mL/min
15,0 mL/min
Laminar Flow Elemente 17 mL/min
+ 3 more
Kötter Consulting Engineers
Active
DIN 4150-1
DIN 4150-2
DIN 4150-3
DIN EN 61400-11
ISO 9613-2
Messschieber für Außen-, 0 mm
Innen- und Tiefenmaße
> 300 mm
Tiefenmessschieber 0 mm
Höhenmessschieber 0 mm
+ 3 more
LAB (UK)
Active
(HSG 248) – 2021
(PCM) based on HSG 248
MAAM 05 based on HSG 248
(HSG 264, 2012)
LAB-EXPERT
Active
NF X43-050 (parties utiles de la
NF X 43-050
NF ISO 22262-1 (parties utiles
LABACUSTIC
Active
UNE-EN ISO 140-5
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
UNE-EN ISO 140-7
UNE-EN ISO 16283-1
+ 1 more
LABAQUA, S.A. (Unipersonal)
Active
UNE-EN ISO 27888
SM 2540
UNE-EN ISO 8467
UNE-EN ISO 7027-1
UNE-EN ISO 10523
+ 3 more
LABOCEA - Site de Brest
Active
DIN EN 13346
CEN / TS 14235
NF T 90-412
DIN EN ISO 7899-1
DIN EN 12880
+ 3 more
LABOCEA - Site de Ploufragan
Active
NF U47-210
NF U47-036-1
NF U47-108
NF U47-100
NF U47-107
+ 3 more
LABOCEA - Site de Quimper
Active
DIN EN ISO 21528-1
DIN EN ISO 21528-2
DIN EN ISO 10304-1
DIN EN ISO 6888-2
NF V08-054
+ 3 more
AOAC 995.11
UNE EN ISO 6869
AOAC 985.35
UNE-EN 17298
ISO 5815-1
DIN ISO 15923-1
EN 13087-2
DIN EN ISO 7887
DIN EN ISO 13395
+ 3 more
DIN EN ISO 14403-2
NF T 90-412
DIN EN ISO 7899-1
NF EN ISO 7887 – méthode C
ISO 5815-1
+ 3 more
DIN EN ISO 17294-2
DIN EN ISO 14403-2
DIN EN ISO 10304-1
NF-T 90-101
NF T90-015-1
+ 3 more
DIN EN ISO 17294-2
DIN EN ISO 14403-2
NF T 90-412
DIN EN ISO 21528-2
DIN EN ISO 7899-1
+ 3 more
NF V08-106
NF T 90-412
NF EN ISO 7887 –
VDE 414-9-11
DIN EN ISO 7899-1
+ 3 more
DIN ISO 11466
NF X31-120
DIN EN ISO 11885
NF X31-147
DIN EN 16175-1
+ 3 more
DIN EN ISO 17294-2
DIN EN ISO 14403-2
DIN EN ISO 13395
NF T 90-412
DIN EN ISO 7899-1
+ 3 more
DIN EN ISO 10703
NF T 90-412
DIN EN ISO 21528-1
DIN EN ISO 7899-1
VDE 414-9-11
+ 3 more
No matching labs found.