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
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18
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Showing 51–75 of 1,670 labs
AISICO
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DIN EN 1793-5
ASTM E 415 21
DIN EN 14726
DIN EN 1794-1
DIN EN 1794-2
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AISLAMIENTOS BURGALESES
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UNE-EN ISO 16283-1
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
IEC 61000-4-2: 2008
VDE 0847-4-2
IEC 61000-4-3: 2006
VDE 0847
IEC 61000-4-4: 2012
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AL-PRO
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IEC 61400-12-1 *
IEC 61400-12-5 *
IEC 61400-50 *
IEC 61400-50-1 *
IEC 61400-50-2 *
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ALAB-Analyse Labor in Berlin
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DIN ISO 16000-3
DIN ISO 16000-6
DIN EN ISO 16017-1
DIN ISO 12884
EN 16516
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ALS France
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DIN EN 14902
DIN ISO 16000-3
DIN EN ISO 16017-1
DIN EN ISO 16017-2
DIN ISO 16000-4
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ALS France – Site de Paris
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NF T 90-412
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN EN ISO 16649-3
DIN EN ISO 6888-3
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ALS Germany
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DIN EN ISO 15587-1
DIN EN ISO 15587-2
DIN EN ISO 14403-2
DIN 38405-4
DIN 38405-8
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ALS Laboratories (UK)
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on BS 4401:Part 3:1970(1986)
ISO 12966-2
AM/C/108 based on BS EN ISO
BS 684 2.14:2001
BS EN 288-Part 9 :1999
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IEC 60068-2-1
IEC 60068-2-2
UNE-EN 60068-2-14
UNE-EN 60068-2-78
IEC 60068-2-6
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AMIANT'AIR
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NF X 43-269
NF X 43-298
DIN EN ISO 11689
NF X 43-257
NF X 43-050
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ANALY-CO Ile de France
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NF X 31-615
DIN EN ISO 7027-2
DIN EN ISO 10523
DIN EN 27888
DIN ISO 17289
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APAVE EXPLOITATION FRANCE
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DIN EN 14385
ETSI EN 301 489-1 V2.2.3 2019-11
NF X43-551
IS EN 1948-1:2006 2006
DIN EN 14789
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APAVE INSPECTION SPAIN
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UNE-EN 14584
UNE-EN 13554
UNE-EN 12819
UNE-EN 12817
UNE-EN ISO 15614-1
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APEC Environmental
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QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
UNE-EN ISO 16283-1
UNE-EN ISO 140-4
CEM DI-002
EURAMET CG-2
CEM DI-014
CEM DI-006
CEM DI-016
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ISO 6059
ASTM D 1209
UNE-EN ISO 8467
SM 4500-NH D 3
UNE 77048
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ISO/IEC 25010
ISO/IEC 25040
ISO/IEC 25012
ISO/IEC 5259-2
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