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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UNE 77061
UNE-EN ISO 15681-2
SM 4500-NH3 F
UNE-EN ISO 8467
UNE-EN ISO 6878
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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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CEM DI-013
UNE 17-710-78
FUNDACION TEKNIKER
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EURAMET CG-2
CEM DI-014
CEM DI-037
UNE-EN ISO 2178
UNE-EN ISO 16809
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UNE-EN 2557
UNE-EN 2002-001
ISO 6508-1
UNE-EN 2559
ASTM B557
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UNE-EN ISO 6507-1
UNE-EN ISO 1461
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ASTM E 415
UNE-EN ISO 15350
ASTM E 1086
UNE-EN 10276-2
UNE-EN ISO 15351
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ISO 11357-5
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ISO 11357-1
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UNE-EN 772-20
UNE-EN 772-13
UNE-EN 772-1
UNE-EN 772-21
UNE-EN 772-3
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GECI ESPAÑOLA
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3 mV U < 330 mV 0,33 V U < 3,3 V 3,3
0 mV U < 200 mV 200 mV U < 2 V 2 V
0 mV U 100 mV 0,1 V < U 1 V 1 V <
5 mV U 30 V
10 mV U < 33 mV 50 Hz f 1 kHz 1 kH
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GIKE
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UNE-EN 12390-2
UNE-EN 12350-1
UNE-EN 1744-1
UNE-EN 933-1
UNE-EN 933-8
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ISO 3795
UNE-EN ISO 105
UNE-EN ISO 13934-1
UNE-EN 12127
UNE-EN ISO 6507-1
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9,8 L ≤ V ≤ 10,2 L (25 L/h ≤ Q ≤ 500 L/h
98 L ≤ V ≤ 104 L (250 L/h ≤ Q ≤ 5000 L/h
970 L ≤ V ≤ 1005 L (2500 L/h ≤ Q ≤ 20000
1305 L ≤ V ≤ 1350 L (5000 L/h ≤ Q ≤ 8000
2660 L ≤ V ≤ 2700 L (5000 L/h ≤ Q ≤ 1000
UNE-EN ISO 16283-1
UNE-EN ISO 16283-2
UNE-EN ISO 16283-3
UNE-EN ISO 3382-2
ISO 16063-21
UNE-EN 60942
UNE-EN 61260
UNE-EN 61672-3
UNE-EN 60804
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IDIADA AUTOMOTIVE TECHNOLOGY
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DIN EN 1385
EN 17092-1:2020
DIN EN ISO 5077
EN 1317-1
DIN EN ISO 13688
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UNE-EN 60942
UNE-EN 61672-3
UNE-EN 60804
UNE-EN 60651
UNE-EN 61252
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INDUSTRIAL LAB R. REIG
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SM 2120
SM 4500-Cl G
UNE EN 27888
SM 4500-H+ B
SM 2130
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INERCO INSPECCIÓN Y CONTROL
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UNE-EN 15259
UNE-EN 13284-1
UNE 77225
EPA 8
UNE 77227
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UNE-EN 60404-14
0 mT ≤ B ≤ 75,7 mT (196 ± 3) mT (990 ± 4
3 mT ≤ B ≤ 300 mT 300 mT ≤ B ≤ 1600 mT
UNE-EN ISO 16283-2
UNE-EN ISO 140-7
UNE-EN ISO 3382-2
UNE-EN ISO 16283-1
UNE-EN ISO 140-4
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