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
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DIN EN ISO 14607
DIN EN 13687-2
DIN EN ISO 15912
ASTM E290-22
DIN EN ISO 19023
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Endress+Hauser SE+
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IEC 61000-4-3: 2006
IEC 61000-4-4: 2012
IEC 61000-4-5: 2005
IEC 61000-4-6: 2013
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DIN EN 12279
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DIN EN 303-2
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(Section 4) based on HSG 248
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CDC73
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ID152
EN ISO 11925-2
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HSG 227 (2004))
Appendix 5 of HSG 227 (2004))
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SOP/11, based on HSG 248
(PCM) based on HSG 248
(HSG 248) – 2021
DIN EN 12457-2
3.02 based on HSG 248
staining based on HSG 248.
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requirements of BS EN 15259:2007
DIN EN 14181
DIN EN 13126-19
DIN EN 15058
DIN EN 14789
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TP003 based on HSG 248
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IEC 61215-1-1
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DIN EN ISO 10077-1
DIN EN 14511-4
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(HSG 248) – 2021
DIN EN 12457-2
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