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
1,670
Accredited labs
18
Countries
Showing 1–25 of 161 labs
A2L ENVIRONNEMENT
Active
NF X 43-269
NF X 43-264
DIN EN ISO 16017-2
NF X 43-257
NF X 43-267
+ 1 more
AC Environnement
Active
NF ISO 21438-3
NF X 43-269
NF ISO 21438-1
DIN EN ISO 16017-2
NF X 43-259
+ 3 more
ACM PHARMA
Active
DIN EN 17126
DIN EN 13624
DIN EN 13727
DIN EN ISO 11930
DIN EN 14476
+ 3 more
DIN EN 12102-1
DIN EN 14511-3
DIN EN 14825
DIN EN 14511-4
DIN EN ISO 3741
+ 1 more
AD-LAB - Brussieu
Active
NF X 43-269
NF X 43-050
NF X43-269 – Annexe
NF X43-050 (parties utiles de la norme)
NF X43-050 (useful parts of the standard
+ 3 more
ADOUR BIO CONSEIL - A.BIO.C.
Active
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN ISO 16649-2
DIN EN ISO 6888-3
DIN ISO 11665-4
+ 3 more
ADRIA
Active
DIN EN ISO 21528-1
DIN EN ISO 21528-2
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN ISO 16649-2
+ 3 more
ALS France
Active
DIN EN 14902
DIN ISO 16000-3
DIN EN ISO 16017-1
DIN EN ISO 16017-2
DIN ISO 16000-4
+ 3 more
ALS France – Site de Paris
Active
NF T 90-412
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN EN ISO 16649-3
DIN EN ISO 6888-3
+ 3 more
AMIANT'AIR
Active
NF X 43-269
NF X 43-298
DIN EN ISO 11689
NF X 43-257
NF X 43-050
+ 1 more
ANALY-CO Ile de France
Active
NF X 31-615
DIN EN ISO 7027-2
DIN EN ISO 10523
DIN EN 27888
DIN ISO 17289
+ 3 more
APAVE EXPLOITATION FRANCE
Active
DIN EN 14385
ETSI EN 301 489-1 V2.2.3 2019-11
NF X43-551
IS EN 1948-1:2006 2006
DIN EN 14789
+ 3 more
AQUANALYSE Laboratoire
Active
NF T 90-412
DIN EN ISO 7899-1
DIN EN ISO 10304-1
DIN EN 12880
ISO 5815-1
+ 3 more
ASPECT Service Environnement
Active
NF-T 90-029
ISO 5815-1
NF T 90-043
NF-T 90-101
NF T90-004
+ 3 more
AVEYRON LABO
Active
DIN EN ISO 14403-2
NF V 04-407
NF T 90-412
DIN EN ISO 7899-1
DIN EN ISO 10304-1
+ 3 more
DIN EN ISO 6507-1
DIN EN ISO 6508-1
NF T90-111
EN 13087-2
DIN EN 10325
+ 3 more
DIN EN ISO 6508-1
NF T90-111
EN 13087-2
ISO 15705
DIN EN ISO 10523
+ 3 more
BDR THERMEA FRANCE
Active
DIN EN 12102-1
DIN EN 14825
DIN EN 14511-3
DIN EN 12102-2
DIN EN 14511-4
+ 3 more
CAE
Active
NF T 90-412
DIN EN ISO 7899-1
DIN ISO 11465
ISO 5815-1
DIN EN ISO 9308-2
+ 3 more
DIN EN ISO 17294-2
DIN EN ISO 14403-2
DIN EN ISO 13395
VDE 414-9-11
DIN EN ISO 10304-1
+ 3 more
No matching labs found.