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
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BJL ENVIRONNEMENT
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NF X 43-269
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NF X43-050 (parties utiles de
NF X 43-050
ISO 16000-7
BJL Laboratoires
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NF X 43-269
NF X 43-050
ISO 22262-1
NF X 43-269 - Annexe K
NF X 43-298
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BLASY + MADER Gesellschaft
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ISO 10381-8
DIN ISO 10381-1
DIN ISO 10381-2
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BOC
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DIN EN ISO 18119
BS EN ISO 10460:2018
BS EN ISO 11623:2015
BS EN 15888:2014
BS EN 14876:2007/Internal proceduresDiss
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BP Europa SE Aral Forschung
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DIN EN ISO 6246
DIN 53160-1
DIN EN ISO 22854
(LBLS) (OMIM 611105) (c.228-
DIN EN 13016-1
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BS EN ISO 10140-2:2021
BS EN ISO 10140-3:2021
BS EN ISO 717-2:2020
ISO 7171
BS EN ISO140-3:1995 (withdrawn)
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DIN EN ISO 7730
ISO 5667-5
ISO 17604
DIN EN ISO 6888-1
ISO 8573-4
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BSI á Íslandi ehf
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Nominal value
TEMPERATURE
See Notes 1 to 3
TORQUE
Case Manager: BC4
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DIN EN ISO 10523
NF X 31-615 (prélèvements purge
BUREAU VERITAS EXPLOITATION
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NF X43-551
DIN 16961-2
DIN EN 14790
AG2 and IS EN 15259:2007
DIN EN 14181
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UNE-EN 13284-2
UNE-EN 15259
UNE-EN 16911-2
UNE-EN 13284-1
UNE EN 1911
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Babcock Marine [Rosyth]
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(HSG 248) – 2021
14B based on HSG 248
DIN EN 12021
14A based on HSG 248
(PCM) based on HSG 248
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Balis Micro
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AM09 based on BS ISO 21527-1:
DIN EN ISO 21528-2
DIN EN ISO 4833-2
BS ISO 15214:1998
0.95) based on BS ISO 21527-2:2008
Bareiss Prüfgerätebau
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Sound intensity — scanning method (ISO 9
Messgeräte für die
Härteskale Shore A*
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Railway freight wagon brake system requi
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DIN EN ISO17892-12
DIN 18134
DIN 18122-2
DIN 19698-1
Bax Engineering
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verwendete Abkürzungen:
Salmonella spp.
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Treponema pallidum (Lues)
Thrombozytäre Antikörper
dysenteriae), Vibrio cholerae
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BeckProsper
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ASTM A370-24
ASTM E23-24
ASTM E 384-22
ASTM E8/E8M-24
ISO 6507-1
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Echinococcus granulosus
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Paragonimus uterobilateralis
Ascaris lumbricoides (IgG)
Brucella spp. (IgG, IgM)
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Best Srl
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ISO 16181-1
NF EN ISO-15587-2
ISO 16186
DIN EN ISO 17229
DIN EN ISO 17232
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Vickers hardness test (ISO 6507)
Temperatur *
Temperaturmessgrößen −35 °C
Railway braking — urban guided transport
Temperatur −40 °C
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Hämoglobin
Differentialblutbild
Erythrozyten
Großes Blutbild
Kleines Blutbild
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Okkultes Blut
Großes Blutbild
Kleines Blutbild
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