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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LABAQUA, S.A. (Unipersonal)
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UNE 77324
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CEM ME-003
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DIN EN 60335-2-51
DIN EN 60335-2-43
IEC 62054-21
IEC 60335-2-51
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UNE-EN ISO 140-5
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UNE-EN 60942
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LABORATORIO DE ENSAYOS ACÚSTICOS DE LA E.T.S. DE INGENIEROS INDUSTRIALES DE LA U.P.M.(LABENAC)
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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
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UNE-EN ISO 140-5
UNE-EN ISO 16283-3
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UNE-EN ISO 140-7
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CEM DI-021
CEM DI-008
EURAMET CG-10
CEM DI-005
EURAMET CG-6
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nach DIN EN ISO 3650:1999
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ISO 5436-1
CEM DI-013
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UNE-EN ISO 10704
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EPA 903.0
EPA 909.0
ISO 13161
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CEM DI-025
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UNE-EN ISO 21920-3
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CEM DI-003
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UNE-EN ISO 7887
UNE-EN ISO 17852
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ISO 7150-1
SM 2510 B
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ISO 5-3
ISO 2813
UNE-EN ISO 9342-1
UNE-EN ISO 8598-1
ISO 3664
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ISO 11290-1
AOAC 991.43
UNE-EN ISO 15216-2
UNE-EN ISO 6579-1
UNE 77324
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UNE 7027-1
ISO 23695
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SM 2510 B
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UNE-EN 7027-1
UNE-EN ISO 10523
SM 2520 B
UNE EN 27888
UNE-EN 872
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UNE-EN 12015
UNE-EN 50065-1
UNE-EN IEC 61000-6-4
UNE-EN IEC 61000-6-3
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UNE-EN ISO 16283-1
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UNE-EN ISO 16283-3
UNE-EN ISO 140-7
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UNE-EN 14385
UNE-EN 15259
UNE-EN 13211
BS ISO 9096:2017
UNE 77216
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