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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Außengewinde
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DIN EN 60601-2-4
IEC 60512-4-1
DIN EN 124-2
IEC 60512-4-3
DIN EN 60601-2-44
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Life Environmental Services
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Aluminium
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Eisen, Kupfer
Ampicillin
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anteile
Kohlenstoffmonoxid
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Methan
Ethan
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BS EN ISO 14644-1:2015
London Borough of Enfield
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staining based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
London Laboratories
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(HSG 248) – 2021
ASB04 based on HSG 248
(PCM) based on HSG 248
Lucion Services
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(HSG 248) – 2021
(PCM) based on HSG 248
3492, ISO14966 and HSG 248
DIN EN 14629
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Ludwig Schneider Messtechnik
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Taupunkttemperatur
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thermometer (SPRT) *)
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Cryptococcus neoformans
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Metromec Software AG
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M E Broadstone Limited
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Plain ring gauges (taper)
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LENGTH
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NF X43-551
ETSI EN 301 489-1 V2.2.3 2019-11
NF X 44-052
DIN EN 13284-1
DIN EN 14385
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DIN EN 14385
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IS EN 1948-1:2006 2006
DIN EN 14789
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UNE-EN ISO 140-7
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DIN EN 13180
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DIN EN IEC 60068-2-11
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IEC 62386-101
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0,005 l/min ≤ Q ≤ 50 l/min
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20 m3/h Q 30 m3/h
30 m3/h < Q 70 m3/h
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DIN EN 13018
DIN EN 50289-1-2
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Kraft 50 N
Sound power — survey method (ISO 3746)
> 200 N
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0,2 kN
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auch direktanzeigend 35 °C
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auch direktanzeigend
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