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 626–650 of 1,670 labs
IANESCO
Active
DIN EN ISO 17294-2
ISO 7086-2:2000
DIN EN ISO 14403-2
DIN EN ISO 13395
NF T 90-412
+ 3 more
DIN 4150-1
DIN 4150-2
DIN 4150-3
DIN EN 61800-5-1: 2017
ICAR-CM2T
Active
NF EN ISO 1927-3
NF EN ISO 1927-5
ASTM C 862
ASTM C 865
(DIN EN 61094-4:1996)
+ 3 more
IDIADA AUTOMOTIVE TECHNOLOGY
Active
DIN EN 1385
EN 17092-1:2020
DIN EN ISO 5077
EN 1317-1
DIN EN ISO 13688
+ 3 more
IFB Eigenschenk
Active
DIN EN ISO 17892-2
DIN EN ISO 17892-3
DIN EN ISO 17892-4
DIN 18121-2
DIN 18125-2
+ 3 more
Kraft 10 kN
Sound power — survey method (ISO 3746)
Radaufstandskraft- 10 kN
Prüfkraftmesseinrichtung
Länge 10 mm
HbA1c
Vitamin A
Vitamin B1
Vitamin B2
Vitamin B6
+ 3 more
IFTS
Active
NF X 45-301
NF X 45-302
NF X 45-303
ASTM F795-88
NF P 90-319 de 02/2011
+ 3 more
UNE-EN 60942
UNE-EN 61672-3
UNE-EN 60804
UNE-EN 60651
UNE-EN 61252
+ 1 more
Thrombozytenaggregometrie
Drogen- und
Medikamentenscreening
Freie Fettsäuren
Linolensäure, Eicosapentaensäure
+ 3 more
ILSA SPA
Active
UNI EN 17702-2
DIN EN 15476
ISO 14820-2
NF EN 13520 ISO 17704
EN 17703
+ 2 more
ASTM F1978
ASTM G195
DIN EN ISO 4287
DIN EN ISO 4288
DIN EN ISO 5470-1
+ 3 more
Temperaturanzeigegeräte –100 °C
- Thermopaare, Thermoelemente
Typ J, K und N
für Widerstands- –100 °C
- Direktanzeigende Thermometer
+ 3 more
Fettsäureprofil der
Erythrozytenmembran
Kurzkettige Fettsäuren
MMA (Methylmethacrylat)
Gesamtporphyrine
+ 3 more
Hämoglobin A1c (HbA1c)
Differenzialblutbild
Erythrozyten
Erythroblasten (NRBC)
Hämatokrit
+ 3 more
HbA1c
Eosinophile, Basophile, MCV, MCH)
Retikulozyten
Urinsediment
Elektrolyte (Kalium, Natrium, Chlorid)
+ 3 more
IMPELAB
Active
DIN EN ISO 7932
DIN EN ISO 6579-1
DIN EN ISO 7937
DIN EN ISO 11290-1
0.95) based on BS ISO 21527-2:2008
+ 2 more
IMQ SpA
Active
DIN EN 62053-23: 2017-09
DIN EN ISO 11816-1
IEC 62109-1
IEC 60598-2-2
DIN EN 62053-24
+ 3 more
IMQ SpA
Active
DIN EN 14511-2
DIN EN 13141-7
DIN EN 60704-2-10
DIN EN 16147
IEC 60704-2-1
+ 3 more
DIN EN ISO 10705-2
ISO 11731
DIN EN 15634-1
ISO 15705
EPA 353.2 1993
+ 3 more
INDUSTRIAL LAB R. REIG
Active
SM 2120
SM 4500-Cl G
UNE EN 27888
SM 4500-H+ B
SM 2130
+ 3 more
INERCO INSPECCIÓN Y CONTROL
Active
UNE-EN 15259
UNE-EN 13284-1
UNE 77225
EPA 8
UNE 77227
+ 3 more
No matching labs found.