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
1,868
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Showing 126–150 of 154 labs
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
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QUACER
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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
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CEM DI-021
CEM DI-004
CEM EL-007
CEM DI-003
CEM DI-008
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EURAMET CG-6
CEM DI-021
CEM DI-004
CEM DI-013
CEM DI-012
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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
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UNE-EN 13032-1
UNE-EN 13032-4
UNE-EN 62722-2-1
IEC 62722-2-1
IEC 62717
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UNE-EN ISO 16283-1
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
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
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TECNATOM, S.A. (Unipersonal)
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UNE 73109
IEC 60780 (1998)
UNE 73109 (2001)
ISO 28218
ISO 27048
UNE-EN ISO 14644-3
UNE-EN ISO 14644-1 (sin realizar toma se
ISO 14644-3
UNE-EN 12469
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
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DIN EN 16615
DIN EN 17658
DIN EN 13697
IEC 60127-6
DIN EN 13727
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TRADELAB, S.L. (Unipersonal)
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UNE-EN 60942
UNE-EN 61672-3
UNE-EN 60804
UNE-EN 60651
UNE-EN 61252
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UNE-EN ISO 868
ASTM D 2240
ISO 48-9
UNE 7050-3
UNE-EN ISO 10360-2
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UNE-EN 61672-3
UNE-EN 60651
UNE-EN 60804
UNE-EN 61252 (Técnica calibrador acústic
UNE-EN 60942
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UNE-EN 60903
UNE-EN IEC 61243-1
UNE-EN 50508
UNE 204001
UNE-EN 61111
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UNE-EN 14181
UNE-EN 13284-2
UNE-EN 15259
UNE-EN 16911-2
UNE-EN 14385
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UNIVERSITAT DE GIRONA
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UNE-EN 25663
UNE-EN 872
UNE-EN ISO 6878
UNE EN 27888
UNE-EN ISO 10523
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URIKER
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UNE 77061
SM 4500-NO-3 E
UNE-EN ISO 7027-1
ISO 15923-1
UNE-EN ISO 7393-2
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