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
Accredited labs
18
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Showing 601–625 of 1,670 labs
DIN EN ISO 10140-1
DIN EN ISO 717-1
DIN EN ISO 10140-2
DIN EN ISO 10140-4
DIN EN ISO 10140-5
HaBu Hauck Prüftechnik
Active
Härte *) 20 HRA
Härtevergleichsplatten 20 HRB
nach Rockwell Verfahren 20 HRC
40 HRD
60 HRF
+ 3 more
Hampshire Scientific Service
Active
(HSG 248) - 2021
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)
+ 3 more
Hann Tucker Associates
Active
ISO 7171
ISO 1407
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
Hartford Steam Boiler UK
Active
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
+ 3 more
automatische Zelldifferenzierung
Erythrozyten
Leukozyten
Retikulozyten
Thrombozyten
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Healthy Abode
Active
ISO 7171
BS EN ISO 140-4:1998
BS EN ISO 16283-1:2014+A1:2017BS EN ISO
BS EN ISO 16283-2:2020
HTM 08-01 - 2013
+ 2 more
(HSG 264, 2012)
and Appx. 3 of HSG 227 (2004))
Executive guides HSG 264 (2012)
Kraft (WPM)
Werkstoffprüfmaschinen
Acoustics — tonality assessment (DIN 456
messeinrichtungen von
Härte (WPM) 30 HBW
+ 3 more
Absolutdruck p
abs
> 41 bar
Negativer und
positiver Überdruck
+ 3 more
Heywood Williams Components
Active
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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Hohenstein Laboratories
Active
DIN 53160
DIN 54034
DIN 54056
DIN EN 20105-A02
DIN EN 20105-N01
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Taupunkttemperatur
thermometer, -80 °C bis
Railway braking — urban guided transport
> -35 °C bis
Temperatur- −35 °C bis
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–1 bar
Positiver und negativer
Positiver Überdruck p e
> 0,0 bar
Absolutdruck p abs 0,25 bar
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Hottinger Brüel & Kjaer
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Übertragungsmaß von
Messmikrofonen oder
Freifeld-Leerlauf- 20 Hz
Freifeld -Übertragungsmaß
Vorverstärker, nach IEC
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Hydrodata
Active
DIN EN ISO 5667-1 (A 4)
DIN 38402-A 12
DIN 38402-A 13
DIN 38402-A 15
DIN EN ISO 5667-3 (A 21)
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Hydrotechnik
Active
Negativer und
Positiver Überdruck p e
> 0,015 bar
Überdruck p
(ein- oder mehrgängige
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HygCen Germany
Active
DIN EN ISO 10993-1
DIN EN ISO 10993-5
DIN EN ISO 17405
ISO 10993-23
DIN EN ISO 10993-18
+ 3 more
Hygiene Nord
Active
DIN EN ISO 10993-5
DIN EN ISO 10993-1
DIN EN ISO 11737-2
DIN EN 1040
DIN EN IEC 60601-2-75
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Innen- und Tiefenmaße
Konventioneller
Wägewert/
Massenormale
Festkörpervolumen
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I2 Analytical
Active
staining based on HSG 248.
(HSG 248) – 2021
(PCM) based on HSG 248
A007B based on BS EN15051-2:2013 +1:2016
DIN EN 12457-3
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