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 251–275 of 1,670 labs
CERECO - LABORATOIRE SUD
Active
DIN EN 1988-1
DIN EN ISO 17294-2
NF T 90-412
DIN EN ISO 7899-1
DIN EN ISO 10304-1
+ 3 more
CERECO - LIEU SAINT-AMAND
Active
NF V 04-407
NF T 90-412
DIN EN ISO 6888-1
NF V04-403
NF V04-408
+ 3 more
CEREMA / DTER Méditerranée
Active
DIN EN 12593
DIN EN 1097-4
DIN EN 933-1
DIN EN 12607-1
DIN EN 1427
+ 3 more
CEREMA / DTER Occitanie
Active
DIN EN 12390-6
DIN EN 62196-1: 2015
DIN EN 12390-3
NF P 98-532
NF P 98-533
+ 3 more
DIN EN 16334
EN 50128
EN 50129
DIN EN 50215
EN 50657
+ 3 more
CERTOTTICA S.C.R.L.
Active
ISO 17234-1
ISO 4045
EPA 8270
ISO 17234-2
DIN EN ISO 17075-1
+ 3 more
DIN EN 13284-1
BS ISO 9096:2017
requirements of BS EN 15259:2007
Standard and BS EN 15259:2007
DIN EN ISO 16911-1
+ 3 more
CESI
Active
DIN EN 62053-23: 2017-09
DIN IEC 62067
DIN EN 62271-102
DIN EN 60079-11
DIN EN 62271-103
+ 3 more
CETA Testsysteme
Active
Druck *
> –0,12 bar bis
negativer und positiver
Überdruck p e > –0,01 bar bis
> 0,03 bar bis
+ 3 more
CEcert
Active
IEC 61000-4-2: 2008
EN IEC 61000-4
IEC 61000-4-3: 2006
IEC 61000-4-4: 2012
IEC 61000-4-5: 2005
+ 3 more
CHEMISERVICE
Active
DIN EN 17892
NEN-EN 16618
(incl EN 62366-1: 2015 +A1:
BS EN 15662
ISO 12966-2
+ 3 more
DIN EN ISO 14402
EPA 3630
EPA 1613
ISO 14189
ISO 11731
+ 3 more
CHIMICAMBIENTE
Active
DIN EN 1186-3
IEC 62321-3-1
DIN EN 13727
EPA 6020
DIN EN 12457-2
+ 3 more
CIRCUTOR, S.A. (Unipersonal)
Active
UNE-EN 61000-4-2
UNE EN 61000-4-5
UNE-EN 55016-2-1
UNE-EN 61000-4-11
UNE-EN 61000-4-8
+ 3 more
UNE-EN ISO 140-5
UNE-EN ISO 16283-3
UNE-EN ISO 140-7
UNE-EN ISO 16283-1
UNE-EN ISO 140-4
CLOVER TECHNOLOGIES
Active
ISO/IEC 15408-3
ISO/IEC 15408-1
ISO/IEC 15408-2
ISO/IEC 15408-4
ISO/IEC 15408-5
+ 1 more
CNPP Entreprise
Active
DIN EN 1254-2
DIN EN 1254-3
DIN EN 1254-5
DIN EN 12101-10
BS EN 50291-1:2018
+ 3 more
COAGUMED Gerinnungszentrum
Active
Thrombozytenaggregationstest
Blutbild mit Vordifferenzierung
Calcium
Natriumchlorid
Kalium
+ 3 more
CEM EL-020
EURAMET cg-17
CEM EL
CEM ME-004
EURAMET cg-11
+ 3 more
UNE 118019
UNE 118012
ISO 22980
UNE 118020
UNE 118021-2
- Gleichspannung
Quellen > 0,10 V
> 1 V
> 10 V
- Gleichstromstärke
+ 3 more
CONSORCI DE MEDI AMBIENT I SALUT PÚBLICA DE LA GARROTXA (SIGMA) LABORATORI POLIVALENT DE LA GARROTXA
Active
SM 3111 B
SM 3500-K B SM 3500-Na B
SM 2330 B
SM 3113 B
UNE-EN ISO 8467
+ 3 more
ISO 19250
EPA 7473 2007
EPA 5030
EPA 8260
DIN EN 1484
+ 3 more
COSMOB
Active
ISO 16000-3
BS ISO 9227:2022
ISO 16000-6
ISO 16000-9
DIN EN 14749
+ 3 more
No matching labs found.