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
Countries
Showing 151–175 of 183 labs
(2,2 ± 0,1) ⋅ 10-2 mol/mol (99,5 ± 0,5)
(15 ± 5) ⋅ 10-6 mol/mol (100 ± 5) ⋅ 10-6
(7,5 ± 0,2) ⋅ 10-2 mol/mol (15 ± 0,5) ⋅
5 mV ≤ U ≤ 10 V 10 V < U ≤ 1000 V
45 Hz ≤ f ≤ 60 Hz 10 mV ≤ U ≤ 10 V 10 V
100 µA ≤ I ≤ 400 mA 400 mA < I ≤ 10 A 10
300 mA ≤ I ≤ 15 A
45 Hz ≤ f ≤ 60 Hz 100 µA ≤ I ≤ 400 mA 40
+ 2 more
S.E. CARBUROS METÁLICOS
Active
0,03 · 10-2 mol/mol C < 0,3 · 10-2 mol
0,3 · 10-2 mol/mol C 1,1 · 10-2 mol/
1,1 · 10-2 mol/mol ≤ C < 26 · 10-2 mol/m
1,1 · 10-2 mol/mol ≤ C < 26 · 10-2 mol/m
9 · 10-6 mol/mol C < 75 · 10-6 mol/mol
+ 3 more
(15 ± 1) ⋅ 10-6 mol/mol (1000 ± 50) ⋅ 10
(8 ± 0,5) ⋅ 10-2 mol/mol (1,4 ± 0,1) ⋅ 1
(3000 ± 150) ⋅ 10-6 mol/mol (9 ± 1) ⋅ 10
(80 ± 8) ⋅ 10-6 mol/mol
(100 ± 8) ⋅ 10-6 mol/mol
SEQUOPRO
Active
0,015 l/min ≤ Q ≤ 40 l/min
0,0 · 10-9 mol/mol
20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m
0,00 · 10-6 mol/mol
0,5 ⋅10-6 mol/mol ≤ C ≤ 10 ⋅10-6 mol/mol
+ 3 more
1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg
10 g 20 g 50 g 100 g 200 g 500 g 1 kg 2
.1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg
DIN EN 61010-2-010: 2015
DIN EN 60335-2-9
IEC 61000-4-8: 2009
IEC 61010-2-010: 2014
DIN EN 61010-2-101
+ 3 more
UNE-EN 13032-1
UNE-EN 13032-4
UNE-EN 62722-2-1
IEC 62722-2-1
IEC 62717
+ 1 more
UNE-EN ISO 16283-1
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
-95 kPa ≤ P < 0 kPa 0 kPa ≤ P ≤ 1 kPa 1
-95 kPa ≤ P ≤ -5 kPa - 5 kPa < P < -1 kP
(5 ± 0,2) · 10-2 mol/mol
(1000 ± 50) · 10-6 mol/mol
(15 ± 2) · 10-6 mol/mol
UNE-EN 12341
0,015 l/min ≤ Q ≤ 50 l/min
20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m
20 ⋅10-9 mol/mol ≤ C ≤ 100 ⋅ 10-9 mol/mo
100 ⋅ 10-9 mol/mol ≤ C ≤ 1000 ⋅ 10-9 mol
+ 3 more
ISO 13347-3
BS EN ISO 5801:2008 method
ISO 14695
UNE-EN ISO 140-5
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
UNE-EN ISO 140-7
UNE-EN ISO 16283-1
+ 1 more
TELEACUSTIK INGENIEROS
Active
UNE-EN ISO 16283-3
DIN EN ISO 16283-1
UNE-EN ISO 3382-2
BS EN ISO 16283-2:2020
THOR ESPECIALIDADES
Active
DIN EN 16615
DIN EN 17658
DIN EN 13697
IEC 60127-6
DIN EN 13727
+ 3 more
TRADELAB, S.L. (Unipersonal)
Active
UNE-EN 60942
UNE-EN 61672-3
UNE-EN 60804
UNE-EN 60651
UNE-EN 61252
+ 3 more
UNE-EN ISO 868
ASTM D 2240
ISO 48-9
UNE 7050-3
UNE-EN ISO 10360-2
+ 3 more
UNE-EN 61672-3
UNE-EN 60651
UNE-EN 60804
UNE-EN 61252 (Técnica calibrador acústic
UNE-EN 60942
+ 3 more
TESICNOR
Active
UNE-EN 60903
UNE-EN IEC 61243-1
UNE-EN 50508
UNE 204001
UNE-EN 61111
+ 2 more
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