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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M003 based on HSG 248
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M002based on HSG 248
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Hampshire Scientific Service
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ASB/SOP/OM8 based on HSG 248
ASB/SOP/OM6 based on HSG 248
DIN EN 12697-11
on BS 4401:Part 3:1970(1986)
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Hann Tucker Associates
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ISO 7171
ISO 1407
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
Hartford Steam Boiler UK
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BS 2790 - Specification for the design a
BS 1113 - Specification for the design a
BS EN 13480 Parts 1 to 8 - Metallic
EN 13445 – Parts 1 to 10 Unfired pressur
BS EN ISO 15614 and ASME IX
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Healthy Abode
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ISO 7171
BS EN ISO 140-4:1998
BS EN ISO 16283-1:2014+A1:2017BS EN ISO
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HTM 08-01 - 2013
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and Appx. 3 of HSG 227 (2004))
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Heywood Williams Components
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DIN EN 1026
DIN EN 12046-2
BS 6375-1:2015 + A1:2016 and the
DIN EN 1027
DIN EN 1629
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I2 Analytical
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staining based on HSG 248.
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A007B based on BS EN15051-2:2013 +1:2016
DIN EN 12457-3
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DC Resistance
DC VOLTAGE
Temperatur-Simulation
AC CURRENT
Base metal thermocouples
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ASTM D3338
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ITS Testing Services (UK)
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UK 3725 based on ASTM D2163
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IP 411, ISO 6251
ASTM D6667 mod
ISO 8973 modified
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Intona
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and Appx. 3 of HSG 227 (2004))
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J B-Monitor
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(PCM) based on HSG 248 – 2021
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(PCM) based on HSG 248
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JCS Technology
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ISO 178
BS 5350:Part C13
BS 2782 Part 10 Method 1005
BS EN ISO 14125
MIL-STD 810G:2008 Method 501.5
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Javer Labs
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MIL-STD-810G, Method 508:7
BS 2011:2.1 Ca:1977
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Johnson and Allen
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DC CURRENT
INSPECTION EQUIPMENT
AC CURRENT 50 Hz RMS
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KP Acoustics Research Labs
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BS EN ISO 10140-2:2021
ISO 3745
ISO 7171
IEC 60601-1
accordance with BS EN ISO 5349-1
Kiwa
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DIN EN 13079
BS 1212-4:1991 Clause 4, 13, 14
DIN EN 14622
BS 1212-3:1990 Clause 4
DIN EN 14623
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Kiwa
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DIN EN 55011: 2018
IEC/CISPR 22
DIN EN 55016-2-1
IEC 61326-2-2: 2012
IEC 61000-6-1
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Kiwa
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DIN EN 16510-2-3
DIN EN 16510-2-1
DIN EN 13229
DIN EN 16510-1
DIN EN 13240
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Kordus Consulting
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and Appendix 3 of HSG 227 (2004))
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