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
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DIN EN ISO 3382-2
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BS EN ISO 3382-2
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NF EN ISO 3382-2
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UNI EN ISO 3382-2
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UNE EN ISO 3382-2
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NEN EN ISO 3382-2
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DIN EN ISO 1996-2
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BS EN ISO 1996-2
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NF EN ISO 1996-2
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UNI EN ISO 1996-2
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UNE EN ISO 1996-2
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NEN EN ISO 1996-2
1,670
Accredited labs
18
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Showing 426–450 of 1,670 labs
UNE EN ISO 15213-1
ISO 6888-1
ISO 7251
ISO 6888-3
ISO 4831
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EUROFINS ENVIRON-LAB SRL
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DIN EN 12457-2
ASTM D5373-21
NEN-EN 13191-1
EPA 5035
ISO 16200-1
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EUROFINS HYDROLOGIE EST
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DIN ISO 17289
NF X 31-615
DIN EN ISO 7027-2
DIN EN ISO 10523
DIN EN ISO 7393-2
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EUROFINS HYDROLOGIE NORD
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NF T90-111
DIN EN ISO 14403-2
NF T 90-412
DIN EN ISO 7899-1
NF-T 90-029
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EUROFINS HYDROLOGIE OUEST
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VDE 414-9-11
DIN EN ISO 10304-1
NF X 31-615
ISO 5815-1
NF T90-015-1
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UNE 77061
UNE-EN ISO 15681-2
SM 4500-NH3 F
UNE-EN ISO 8467
UNE-EN ISO 6878
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EUROFINS LABORATOIRE CENTRE
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DIN EN ISO 21528-2
DIN EN ISO 6888-1
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN ISO 16649-2
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DIN EN ISO 17294-2
DIN EN ISO 13395
NF T 90-412
NF U47-101
DIN EN ISO 7899-1
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DIN ISO 11665-4
DIN EN ISO 7932
DIN 53483-2
DIN EN ISO 15213-2
NF V08-050
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EUROFINS LABORATOIRE NORD
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DIN EN ISO 6888-1
DIN EN ISO 21528-2
DIN EN ISO 6888-2
DIN ISO 16649-2
NF V08-054
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DIN EN ISO 21528-1
NF V08-401
DIN ISO 16649-1
DIN EN ISO 6888-1
DIN EN ISO 21528-2
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EUROFINS LCDI
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DIN EN ISO 13395
DIN EN ISO 10304-1
ISO 5815-1
NF T90-015-1
DIN EN ISO 10523
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NF X 43-269
NF X 43-050
ISO
ISO 16000-7
DIN EN ISO 1135-4
DIN EN 13744
IEC 62623: 2012
DIN EN 13746
Sound Attenuation EN ISO 4869-1:2018
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ISO 14389
BS EN ISO 14362-1
BS EN ISO 14362-3
UNE-EN ISO 14362-1
UNE-EN ISO 14362-3
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EXOLUM CORPORATION
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UNE-EN ISO 20884
UNE-EN ISO 12185
UNE-EN ISO 12156-1
ASTM D 93
ASTM D 2622
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EXcorLab
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DIN EN ISO 1135-4
EN ISO 1135-5
DIN EN ISO 10993-1
DIN EN ISO 8637-1
DIN EN ISO 7199
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Eckert & Ziegler Nuclitec
Active
Aktivität
20 Bq
> 20 Bq
Spezifische Aktivität
radioaktiver Lösungen 20 Bq·g
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Efectis Nederland
Active
ISO 5660-1
DIN EN 1365-1
EN 13381-4
DIN EN 1634-1
EN 1365-2
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Efectis UK/Ireland
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EN 1364-3
DIN EN 1366-4
EN 1364-4
BS 476-21
BS 476-22
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Elektro Struß
Withdrawn
Gleichspannung 30 mV
/ Messgeräte
> 0,33 V
> 3,3 V
> 33 V
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Elektro Wilhelm
Active
Taupunkttemperatur
für Widerstands- ˃ 500 °C
- Direktanzeigende Thermometer
Thermoelemente ˃ 500 °C
Widerstands- -50 °C
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