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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Bridgend Asbestos Services
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Building Analysis & Testing
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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
ISO 1407
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C G C Laboratory
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(PCM) based on HSG 248
SOP 5, based on HSG 248
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C.W.E. Services
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(HSG 264, 2012)
HSG 227 (2004))
Safety Executive guides HSG 264
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DIN EN 13284-1
BS ISO 9096:2017
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DIN EN ISO 16911-1
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DC VOLTAGE
DC Resistance
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Campbell Associates
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BS ISO 488:2008, 2446:2008 and
on BS 4401:Part 3:1970(1986)
BS 696-2:1989 (superseded and
BS ISO 6731:2010
ISO BS EN 3727-1:2002
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Electrolytes in blood serum:
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(cdt), Deletion an Pos 117
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BS 6068-4.12:1998 (withdrawn)
Chamois Metrology
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Calibration of pressure
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Cirrus Research
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Chronic progressive external
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DC CURRENT
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BS EN ISO 16283-1:2014+A1:2017BS EN ISO
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HTM 08-01 - 2013
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
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