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
1,868
Accredited labs
20
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Showing 101–125 of 1,868 labs
DIN EN ISO 20344
DIN EN 13634
BS EN ISO 20344::2011 Clause 5.1
DIN EN ISO 22568-1
ISO 22568-1: 2019 Clause 5.2.1
+ 3 more
UNE-EN 772-11
UNE 136029
DIN 4772:1979
DIN EN 16510-2-4
DIN EN 17539
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UNE 81752
UNE 81550
UNE 81599
UNE 81587
UNE 81586
ASPECT Service Environnement
Active
NF-T 90-029
ISO 5815-1
NF T 90-043
NF-T 90-101
NF T90-004
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IEC 62471-7
IEC 62471: 2006
UNE-EN 13032-1
DIN EN 62471: 2009
UNE-EN 13032-4
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ISO 5667-5
DIN EN 12457-2
ISO 18787
DIN EN ISO 6888-1
UNI 10802
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Gleichstromleistung
/ Messgeräte
Wirkleistung
Leistungsfaktor
- Gleichspannung
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IEC 15408-1
IEC 18045
IEC 18367
IEC 20543
IEC 20004
ASTM E8/E 8M
DIN EN 10002-1
DIN EN 10002-5
DIN EN ISO 6892-2
DIN EN ISO 643
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AUDIOLID, S.L.(Unipersonal)
Active
UNE-EN ISO 140-5
UNE-EN ISO 16283-3
UNE-EN ISO 16283-2
UNE-EN ISO 140-7
UNE-EN ISO 3382-2
+ 2 more
AUDIOTEC INGENIERÍA ACÚSTICA
Active
UNE-EN ISO 10140-2
UNE-EN ISO 10140-3
UNE-EN ISO 10140-1
UNE-EN ISO 354
UNE-EN 1793-1
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AVEYRON LABO
Active
DIN EN ISO 14403-2
NF V 04-407
NF T 90-412
DIN EN ISO 7899-1
DIN EN ISO 10304-1
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AVL DiTEST
Active
Abgasmessgeräte für
− Abgasmessgeräte für Fremdzündungsmotor
Kohlenstoffmonoxid
Kohlenstoffmonoxid CO
Kohlenstoffdioxid CO2
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AWE
Active
(HSG 248) – 2021
LQP007 based on HSG 248
LQP003 based on HSG 248
(PCM) based on HSG 248
the guidance of GPG 14
PERSONAL DOSE EQUIVALENT:
RESPONSE:
Absolute Calibration
Active
DC Resistance
CFH-Gen, Macula-Degeneration
DC RESISTANCE (continued)
DC VOLTAGE
DC VOLTAGE (continued)
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Acorn Analytical Services
Active
(HSG 248) – 2021
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
Appendix 5 of HSG 227
Acoustic Design Technology
Active
ISO 7171
BS EN ISO 140-4:1998
HTM 08-01
ISO 1407
BS EN ISO 717-2:2020
ISO 11654
BS EN ISO 10140-2:2021
ISO 7171
ISO 354
BS EN ISO 10140-3:2021
+ 3 more
Sound Calibrators
Pistonphones
based:
level
Microphones
+ 2 more
DIN EN ISO 11127-6
DIN EN 13727
1) BS EN ISO 11930:2019+
2) QMIC WI 22, based on BS EN
Taupunkttemperatur
Railway braking — urban guided transport
Temperaturtransmitter
Widerstandssensor *)
–30 °C
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