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
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SGS United Kingdom
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BS EN ISO 1833-1:2020
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DIN EN 13284-1
ENV/054 based on BS EN
ISO 11731
DIN EN 14791
IEC 60519-11
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M002based on HSG 248
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Scopus Asbestos Compliance
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SAC-SOP-07 based on HSG 248
staining based on HSG 248
SembCorp Utilities (UK)
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DI/AN/ME/025 based on HSG 248
DI/AN/ME/001 based on HSG 248
DI/AN/ME/026 based on HSG 248
(PCM) based on HSG 248
ServiceCal
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PRESSURE (cont’d)
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Sharps Redmore Partnership
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BS EN ISO 16283-1:2014+A1:2017BS EN ISO
BS EN ISO 16283-2:2020
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
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ASTM E 2149-20
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Somerset Council
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R24 based on HSG 248
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BS EN ISO 16283-2:2020
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
ISO 1407
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based on BS EN ISO 6579-1:
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ISO 21149:2017+Amd1:2022
DIN EN ISO 18415
method based on BS ISO 16649-2:
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QOP01 based on HSG 248
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(PCM) based on HSG 248
(HSG 264, 2012)
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AM01 based on BS EN ISO 4833-1:
AM03 based on BS EN ISO 11290-
AM05 based on BS ISO 21528-2:
AM08 based on BS EN ISO 15213-2:2023 by
AM12 based on BS EN
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Spratt & Hamer
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BS EN ISO 140-4:1998
ISO 13829
BS EN ISO 717-2:2020
ISO 1407
BS EN ISO 9972:2015
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Springfields Fuels
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LMM2149, ASTM E112-13 by
ISO 6507-1
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LMM1862, ASTM E112-13 for
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