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 351–375 of 1,868 labs
Thyreoidea stimulierendes
(TSH)
17-α-OH-Progesteron
(17-OH-P)
Immunreaktives Trypsin
+ 3 more
Liquid-in-glass thermometers
ASTM D4052 (Digital density
CheckImmune
Active
Leukozytenzahl
B-Zellzahl (Immunstatus
Rezeptor-Besatz
HLA-DR
Leukozytensubpopulationen
+ 3 more
DIN 38402-A 13
DIN ISO 5667-5 (A 14)
DIN 38402-A 30
DIN 19643-1
ISO 5667-11
+ 3 more
Cirrus Research
Active
Sound Calibrators
Sound Level Meters
One-third octave band filters
(HSG 248) – 2021
SRV-002 based on HSG 248
(PCM) based on HSG 248
CoMech Metrology
Active
Chronic progressive external
Depth
Internal
Dial gauges and dial test
Caliper
+ 3 more
Coesfeld
Active
Kraft (WPM)
Belastungseinrichtungen von
Werkstoffprüfmaschinen
Länge (WPM) 0,5 mm
messeinrichtungen von
+ 3 more
simulation.
parameters and ranges)
digital and analogue
Compli Group
Active
DC CURRENT
DC Resistance
Oscilloscope Calibration
DC VOLTAGE
CAPACITANCE
+ 3 more
Messgeräte 0,001 V
> 0,22 V
> 2,2 V
> 11 V
> 22 V
+ 3 more
BS EN ISO 16283-1:2014+A1:2017BS EN ISO
BS EN ISO 16283-2:2020
HTM 08-01 - 2013
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
+ 3 more
DIN EN 933-11
DIN EN 12390-3
DIN EN 933-3
DIN EN 12390-7
DIN EN 12697-5
+ 3 more
DC CURRENT
LENGTH
DC Resistance
DC VOLTAGE
Cold junction compensation
+ 3 more
Chloride
Potassium
Sodium
Differential Blood Count
White Blood Cell Count
+ 3 more
Corserv Solutions
Active
DIN EN 933-1
(PCM) based on HSG 248
(HSG 248) – 2021
DIN EN 932-1
DIN EN 932-2
+ 3 more
No matching labs found.