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
🇮🇹
UNI EN ISO 1996-2
🇪🇸
UNE EN ISO 1996-2
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NEN EN ISO 1996-2
1,670
Accredited labs
18
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Showing 126–150 of 183 labs
8 mT/A ≤ B/I < 500 mT/A
80 mT ≤ B ≤ 1,1 T
0,2 mT ≤ B < 1,1 T
0 mT ≤ B < 80 mT
10 Wb < 0,2 Wb
+ 2 more
CEM DI-021
CEM DI-008
EURAMET CG-10
CEM DI-005
EURAMET CG-6
+ 2 more
TERMOCAL
Active
3,5 kPa P 70 kPa 70 kPa < P 700 kP
3,5 kPa P 2,0 MPa 2,0 MPa < P 7,0
3,5 kPa P 20 kPa 20 kPa < P 70 kPa
100 kPa P 6,1 MPa 6,1 MPa < P 100
100 kPa P 70 MPa
+ 3 more
nach DIN EN ISO 3650:1999
EURAMET CG-6
ISO 5436-1
CEM DI-013
CEM DI-012
+ 3 more
CEM DI-025
CEM DI-018
UNE-EN ISO 21920-3
CEM DI-009
CEM DI-003
+ 3 more
UNE-EN ISO 7887
UNE-EN ISO 17852
UNE-EN ISO 8467
ISO 7150-1
SM 2510 B
+ 3 more
LABORATORIOS EYCO
Active
ISO 5-3
ISO 2813
UNE-EN ISO 9342-1
UNE-EN ISO 8598-1
ISO 3664
+ 3 more
ISO 11290-1
AOAC 991.43
UNE-EN ISO 15216-2
UNE-EN ISO 6579-1
UNE 77324
+ 3 more
LABORATORIOS OMEGA
Active
UNE 10523
UNE 27888
UNE 7027-1
ISO 23695
UNE-EN ISO 9308-1
+ 3 more
SM 2540 F
SM 2540 C
UNE-EN ISO 7027
SM 2520 B
SM 2510 B
+ 3 more
UNE-EN 7027-1
UNE-EN ISO 10523
SM 2520 B
UNE EN 27888
UNE-EN 872
+ 3 more
UNE-EN 12015
UNE-EN 50065-1
UNE-EN IEC 61000-6-4
UNE-EN IEC 61000-6-3
UNE-EN 61000-6-3
+ 3 more
10 · 10-6 mol/mol C 20 · 10-6 mol/mo
10 · 10-6 mol/mol C 5000 · 10-6 mol/
1 · 10-6 mol/mol C 10 · 10-6 mol/mol
1 · 10-6 mol/mol C 5 · 10-6 mol/mol
10 · 10-6 mol/mol C 100 · 10-6 mol/m
+ 3 more
Margarida
Active
UNE-EN ISO 16283-1
UNE-EN ISO 16283-2
UNE-EN ISO 16283-3
UNE-EN ISO 140-7
UNE-EN ISO 140-4
+ 2 more
MCV
Active
0,005 l/min ≤ Q ≤ 50 l/min
0,5 m3/h≤ Q ≤ 2,8 m3/h
0,6 m3/h Q 2,8 m3/h
20 m3/h Q 30 m3/h
30 m3/h < Q 70 m3/h
+ 3 more
METROCAL CALIBRACIÓN
Active
1 g 2 g 5 g 10 g 20 g 50 g 100 g 200 g 5
5 kg
10 kg 20 kg
100 kg 200 kg 500 kg 1000 kg
1 g 2 g 5 g 10 g 20 g 50 g 100 g 200 g 5
+ 2 more
2 · 10–6 mol/mol C 100 · 10–6 mol/mo
0,1 · 10–2 mol/mol < C 2,5 · 10–2 mol/
1 · 10–6 mol/mol C 100 · 10–6 mol/mo
5 · 10–6 mol/mol C 20 · 10–6 mol/mol
0,15 · 10–2 mol/mol C 20 · 10–2 mol/
+ 3 more
OCA GLOBAL
Active
UNE-EN 14385
UNE-EN 15259
UNE-EN 13211
BS ISO 9096:2017
UNE 77216
+ 3 more
UNE-EN ISO 140-5
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
UNE-EN ISO 140-7
UNE-EN ISO 3382-2
+ 2 more
QUACER
Active
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
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