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
🇪🇸
UNE EN ISO 1996-2
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NEN EN ISO 1996-2
1,868
Accredited labs
20
Countries
Showing 176–200 of 1,868 labs
Asbestos Solution Providers
Active
(HSG 248) – 2021
(PCM) based on HSG 248
(HSG 264, 2012)
Asbestos Survey & Management
Active
QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
Ashcroft Instruments
Active
Absolutdruck p abs 0,015 bar
> 2 bar
> 42 bar
Absolutdruck Pabs
1 bar; 2 bar
+ 3 more
Aspect Quality
Active
DIN 55635
VDE 0468-2-14
VDE 0468-2-1
VDE 0468-2-5
DIN EN 60068-2-30
+ 3 more
AstraZeneca UK
Active
DC CURRENT
AC VOLTAGE (continued)
AC CURRENT
AC Voltage
DIMENSIONAL
+ 3 more
Analysts’ Guide (HSG 248)
(HSG 248) – 2021 Asbestos: The
(PCM) based on HSG 248
Conformity assessment — requirements for
Druckkraftrichtung
Drehmoment 0,01 N∙m
Drehmomentaufnehmer *
Drehmomentmessgeräte *
+ 3 more
Attain RTC
Active
BS EN ISO 10140-2:2021
DIN EN 1366-4
BS EN ISO 10140-1:2021 Annexes
BS EN ISO 10140-3:2021
EN 13823
+ 3 more
Ayerst Environmental
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248
Surveying) based on HSG 248
BAE Systems Marine
Active
Hydraulic pressure (gauge)
TEMPERATURE
DC Resistance
Betriebsübertragungsmaß
Gas pressure (absolute)
+ 3 more
IEC 61400-11:2012/ AMD:2018
IEC 61400-12-2
IEC 61400-50-2
IEC 61400-12-1
IEC 61400-12-3
+ 3 more
BASEC Group
Active
BS 4553-1:1998
BS 4553-2:1998
BS 4553-3:1998
BS 5308-1: 1986 (withdrawn)
BS 5308-2: 1986 (withdrawn)
+ 3 more
DIN EN 1766
DIN EN 12390-1
DIN EN 12390-2
DIN EN 12390-3
DIN EN 12390-5
+ 3 more
BDR THERMEA FRANCE
Active
DIN EN 12102-1
DIN EN 14825
DIN EN 14511-3
DIN EN 12102-2
DIN EN 14511-4
+ 3 more
DIN 52186
ISO 21527-1
DIN EN ISO 527-3
IEC 61924-2
DIN EN 62233
+ 3 more
BIOQUALITA' SRL
Active
0,2 0,003 bis 0,006
(HLA DQ8 (HLA DQB*03:02)
ISO 18787
BS EN 15662
DIN EN ISO 6888-1
+ 3 more
BIOTECNAL
Active
UNE-EN ISO 6579-1
UNE-EN ISO 6222
UNE-EN 26777
UNE-EN ISO 7027-1
en 31-7-79 (BOE 29-08-79)
+ 3 more
No matching labs found.