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
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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 1,576–1,600 of 1,670 labs
Vintec Laboratories
Active
(HSG 248) – 2021
(PCM) based on HSG 248
P052 based on HSG 248
Vistec Electron Beam
Active
− Permanentes Laboratorium
Positionen und Abstände
gleichgerichteter Kanten
positionen von Strukturen
(Hartschichtmasken)
+ 3 more
WENZEL Metrology
Active
Koordinatenmessgeräte
von <7000 mm
under-Edge, UK
INCA3D, Software von
Inspect 3D, Cholet, F
+ 3 more
UNE 73109
IEC 60780 (1998)
UNE 73109 (2001)
ISO 28218
ISO 27048
WIKA Alexander Wiegand SE &
Active
Positiver und −1 bar bis −0,03 bar
Positiver und negativer
(ein- oder mehrgängige
> −0,03 bar bis
> 0,15 bar bis
+ 3 more
WIN Messmittel und Service
Active
− Parallelendmaße
− Längenmessmittel
− Durchmesser
− Formabweichung
− Gewinde
+ 3 more
IEC 61400-12
IEC 61400-12-1
IEC 61400-12-2
IEC 61400-12-3
IEC 61400-12-5
+ 3 more
WINDTEST Grevenbroich
Active
IEC 61400-12-1
IEC 61400-12-2
IEC 61400-12-3
IEC 61400-12-5
IEC 61400-12-6
+ 3 more
WSP UK
Active
(HSG 248) – 2021
AFC based on HSG 248
(PCM) based on HSG 248
SSA based on HSG 248
WTLAB
Active
IEC 62109-1
IEC 61400-21-1
IEC 62109-2
DIN EN 60598-2-4
DIN EN 60068-2-30
+ 3 more
Waagen-Dienst Kirste
Active
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
elektronische Waagen
verwendete Abkürzungen:
1) In den CMC sind die erweiterten Messu
+ 2 more
Waagen-Jöhnk
Active
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
Radiated emissions (CISPR 32)
verwendete Abkürzungen:
Waagen-Kissling
Active
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
Radiated emissions (CISPR 32)
verwendete Abkürzungen:
Waagenfachhandel Hilke
Active
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
elektronische Waagen
verwendete Abkürzungen:
EN 13501-2
DIN 51363-2
BS 1363-1
BS 476: Part 21:1987 Section 5
ISO 834:1975:Sections 5, 6, 7
+ 3 more
WIWeB
Active
DIN EN 2561
DIN EN ISO 14126
DIN EN ISO 14125
DIN EN 2563
DIN 53504
+ 3 more
DIN 45645-2
DIN EN ISO 11690-1
DIN EN ISO 11690-2
Wessex Power Technology
Active
TEMPERATURE
controllers, and recorders)
RELATIVE HUMIDITY
DIN IEC 60060-1
VDE 0432- 1
IEC 60270
VDE 0434
DIN EN 61243-1
+ 3 more
Kohlenstoffmonoxid *)
Kohlenstoffdioxid
Propan *)
Stickstoffmonoxid
Distickstoffmonoxid
+ 3 more
Analysts’ Guide (HSG 248)
(PCM) based on HSG 248
staining based on HSG 248
(HSG 248) – 2021
SOP 12 based on HSG 248
(PCM) based on HSG 248
SOP 11 based on HSG 248
Westward Laboratories
Active
ISO 21528-2
BS ISO 4832:2006
BS ISO 16649-2:2001
Method No 2.9 based on BS EN ISO
Method No 2.12 based on BS EN
+ 3 more
ISO 13720
DIN 3388-4
EPA 6020
EPA 3535
DIN EN ISO 6888-1
+ 3 more
No matching labs found.