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 501–525 of 1,670 labs
DIN EN 13001-1
NF X 43-269
NF X43-050 (parties utiles de
NF X 43-275
NF X 43-257
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FRAMATOME - Saint-Marcel
Active
DIN EN ISO 6507-1
DIN EN ISO 643
NF EN ISO 6520-1
DIN EN ISO 17639
NF EN ISO 6520-2
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CEM DI-013
UNE 17-710-78
FUNDACION TEKNIKER
Active
EURAMET CG-2
CEM DI-014
CEM DI-037
UNE-EN ISO 2178
UNE-EN ISO 16809
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UNE-EN 2557
UNE-EN 2002-001
ISO 6508-1
UNE-EN 2559
ASTM B557
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FUNDACIÓN CIDAUT
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UNE-EN ISO 6507-1
UNE-EN ISO 1461
UNE-EN ISO 898-1
UNE-EN ISO 2178
UNE-EN ISO 6892-1
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FUNDACIÓN IDONIAL
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ASTM E 415
UNE-EN ISO 15350
ASTM E 1086
UNE-EN 10276-2
UNE-EN ISO 15351
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ISO 6721-1
ISO 11357-5
ISO 6721-11
ISO 11357-1
ASTM E2602
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UNE-EN 772-20
UNE-EN 772-13
UNE-EN 772-1
UNE-EN 772-21
UNE-EN 772-3
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Abetalipoproteinämie (MTTP)
Achondroplasie (FGFR3)
Acoeruloplasminämie/Hypocoerulo
plasminämie (CP)
ACTH-unabhängige makronoduläre
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IEC 60068-2-2
DIN EN 13744
IEC 60512-15-1
DIN EN 60068-2-30
DIN EN ISO 11203
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Feinmess Suhl
Active
Parallelendmaße 0,5 mm bis
DIN EN ISO 3650:1999
Messschieber für 0 mm
Außen-, Innen- und
> 300 mm
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Fibre Clear Consulting
Active
M002based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
FlexSpect
Active
#EN ISO 5164:14
# EN 116-97
#ISO 12185
NEN 4400-2
# ISO 13736
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Fluke Precision Measurement
Active
Frequenc 220 mV range
FREQUENCY
10 Hz to 100 kHz
difference from 10 % to 100 % of the sta
6105A control 0° to 360°
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flexiblen Akkreditierungsbereich.
Beschleunigung * 10 m/s
Beschleunigungsaufnehmer
Beschleunigungsaufnehmer 10 m/s
digital (DTI)
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Kraft (WPM)
Vibration measuring instruments — test m
Acoustics — tonality assessment (DIN 456
Härteprüfmaschinen
Länge (WPM)
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DIN EN ISO 8497
ISO 8301
ISO 8302
DIN EN 12664
DIN EN 12667
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Foundation Medicine
Active
(somatische genetische
ACVR1B, AKT1, AKT2, AKT3, ALOX12B, AMER1
GATA3, GATA4, GATA6, GID4, GNA11,GNA13,
CHEK2, CHIC2, CHN1, CIC, CIITA
IRF8, IRS2, ITK, JAK1, JAK2, JAK3, JARID
+ 3 more
Fourstage Environmental
Active
(HSG 248) – 2021
(PCM) based on HSG 248
DOC/002 based on HSG 248
- Gleichspannung
Messgeräte 0,33 V bis < 3,3 V
330 V
Quellen
> 0,1 V
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