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 1–25 of 254 labs
A.U.E.M.
Active
ASTM E8/E 8M
DIN EN 10002-1
ASTM E 21
DIN EN 10002-5
DIN EN ISO 6892-2
+ 3 more
A2E ENVIRONNEMENT
Active
DIN EN 27888
DIN EN ISO 10523
DIN EN ISO 7393-2
NF X 31-615 (Uniquement
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
A2M INDUSTRIE
Active
(BS EN ISO 6892-1: 2019)
DIN EN 10002-1
ISO 6892-1 -2009
ASTM E8/E 8M
ISO 6892-1 -2016
+ 3 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
ACEPE
Active
NF X 43-269
NF X 43-269 –
NF X 43-050
NF ISO 22262-1 (parties utiles
ISO 16000-7
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
AEROLAB
Active
NF EN 12469 Annexe H pour PSM
NF X 44-201 (Octobre 1984) pour PSM
NF EN 12469 Annexe G
NF X 44-201
DIN EN 12469
+ 3 more
ALS
Active
NF X 43-269
NF X43-050 (parties utiles de
ISO 22262-1
NF X 43-257
NF X 43-050
+ 1 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
AN DIAG
Active
NF X 43-269
NF X 43-269 - Annexe K
NF X43-050 (parties utiles de
ISO 22262-1
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
No matching labs found.