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 51–75 of 183 labs
UNE-EN ISO 16283-1
UNE-EN ISO 16283-2
UNE-EN ISO 16283-3
UNE-EN ISO 3382-2
CIEMAT
Active
OM H-3 based on ISO 9698:2019
ISO 13164-4
SM 3111
UNE-EN ISO 13160
ISO 10704
+ 3 more
UNE-EN ISO 5667-19
UNE-EN ISO 16665
UNE-EN 19493
SM 2510 B
SM 4500 H+
UNE 7027-1
UNE 7887
SM 4500-NO B 2
+ 3 more
CIRCUTOR, S.A. (Unipersonal)
Active
UNE-EN 61000-4-2
UNE EN 61000-4-5
UNE-EN 55016-2-1
UNE-EN 61000-4-11
UNE-EN 61000-4-8
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UNE-EN ISO 140-5
UNE-EN ISO 16283-3
UNE-EN ISO 140-7
UNE-EN ISO 16283-1
UNE-EN ISO 140-4
CLOVER TECHNOLOGIES
Active
ISO/IEC 15408-3
ISO/IEC 15408-1
ISO/IEC 15408-2
ISO/IEC 15408-4
ISO/IEC 15408-5
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CEM EL-020
EURAMET cg-17
CEM EL
CEM ME-004
EURAMET cg-11
+ 3 more
UNE 118019
UNE 118012
ISO 22980
UNE 118020
UNE 118021-2
CONSORCI DE MEDI AMBIENT I SALUT PÚBLICA DE LA GARROTXA (SIGMA) LABORATORI POLIVALENT DE LA GARROTXA
Active
SM 3111 B
SM 3500-K B SM 3500-Na B
SM 2330 B
SM 3113 B
UNE-EN ISO 8467
+ 3 more
IEC 61730-2
IEC 61215-1-2
IEC 61215-2
IEC 61215-1-3
IEC 61215-1-4
+ 3 more
DIPE ELECTRÓNICA
Active
0 mV U < 330 mV 330 mV U < 3,3 V 3,3
0 mV U < 120 mV 120 mV U < 1,2 V 1,2
0 A I 330 A 330 A < I 3,3 mA 3,
20 A I 1025 A
20 A I 1025 A F = 50 Hz
+ 3 more
SM 5210 D
UNE-EN ISO 27888
SM 5220 D
SM 2130 B
UNE-EN ISO 11885
+ 3 more
50 ∙ 10-9 mol/mol ≤ C ≤ 237 · 10-9 mol/m
30∙ 10-9 mol/mol ≤ C ≤ 500 ∙ 10-9 mol/mo
50 ∙ 10-9 mol/mol ≤ C ≤ 1000 · 10-9 mol/
50 ∙ 10-9 mol/mol ≤ C ≤ 237∙ 10-9 mol/mo
0,5 ∙ 10-9 mol/mol ≤ C ≤ 15 ∙ 10-9 mol/m
+ 1 more
ECOS DEL PISUERGA
Active
UNE-EN ISO 16283-1
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
UNE-EN ISO 3382-1
UNE-EN ISO 3382-2
200 kg/h ≤ m ≤ 60000 kg/h
200 l/h ≤ Q ≤ 60000 l/h
200 kg/h ≤ m ≤ 30000 kg/h
200 l/h ≤ Q ≤ 30000 l/h
700 Pa ≤ P ≤ 2 MPa
+ 3 more
ENSATEC, S.L. (Unipersonal)
Active
UNE-EN 12211
UNE-EN 12210
UNE-EN 1026
UNE-EN 12207
UNE-EN 14608
+ 3 more
Environmental noise — determination of s
ISO 20906 : 2009-12 :
UNE-EN 12350-2
UNE-EN 12504-1
UNE-EN 12390-2
UNE-EN 12390-3
UNE-EN 12350-1
+ 3 more
UNE-EN ISO 16283-1
UNE-EN ISO 16283-2
UNE-EN ISO 16283-3
UNE 74201
UNE-EN ISO 3382-2
UNE-EN ISO 6892-1
DIN EN 10002-1
ASTM E 8
ASTM E 208
ASTM E208-06
+ 3 more
UNE 64106
BS ISO 6731:2010
UNE-EN ISO 712
UNE-EN ISO 5534
ISO 13580
+ 3 more
UNE EN ISO 15213-1
ISO 6888-1
ISO 7251
ISO 6888-3
ISO 4831
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