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
Countries
Showing 876–900 of 1,670 labs
DIN EN ISO 21528-2
DIN EN ISO 6888-2
DIN ISO 16649-2
DIN ISO 11665-4
NF T90-007
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NF T 90-412
DIN EN ISO 7899-1
NF U47-101
DIN EN ISO 10523
NF T90-015-2
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DIN EN ISO 14403-2
DIN EN ISO 13395
DIN EN ISO 10304-1
DIN EN ISO 15061
ISO 5815-1
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Laboratoire d'Analyses de Surveillance et d'Expertise de la Marine (LASEM) - Base Navale de Brest
Active
DIN EN ISO 17294-2
NF T 90-412
VDE 414-9-11
DIN EN ISO 10304-1
DIN EN ISO 9698
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DIN EN ISO 17294-2
NF T 90-412
DIN EN ISO 7899-1
DIN EN ISO 10304-1
ISO 5815-1
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DIN EN 27888
NF T 90-412
DIN EN ISO 7393-2
DIN EN 26461-2
DIN EN ISO 10523
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DIN EN ISO 17294-2
DIN EN ISO 7899-1
VDE 414-9-11
DIN EN ISO 10304-1
DIN EN ISO 10523
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DIN EN 17126
DIN EN 14562
DIN EN 14348
IEC 60127-5
DIN EN 14563
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DIN ISO 11665-4
DIN 53483-2
DIN EN ISO 7937
NF V08-050
NF V 08-060
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ISO 12846
ISO 11348-3
DIN EN 12457-2
ISO 9377-2
ISO 19250
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UNI 13649
EPA 6010
DIN EN 12880
DIN EN 13284-1
UNI 9432
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Basophile Granulozyten
Eosinophile Granulozyten
Erythrozyten
Hämatokrit
Leukozyten
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Laborgemeinschaft Köln
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Liste aller Untersuchungsverfahren im fl
Webpräsenz des Medizinischen Laboratoriu
HbA1c
Basophile
Basophile absolut
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Laborgemeinschaft Odenwald
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HbA1c
Großes Blutbild
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Retikulocyten
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Willibrand Faktors
a-Hydroxy-Alprazolam
Amilsulprid
7-amino-Flunitrazepam
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Lambda Calibration
Active
PRESSURE (cont’d)
Distortion Factor
Spot frequency
Phase angle
(Herpes simplex virus type
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Lambeth Scientific Services
Active
(HSG 248) – 2021
(PCM) based on HSG 248
P-12 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
ISO 12966-2
F06 6 & F06 5 based on BS EN
F05 4 based on BS 770:Part
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GPT
GOT
GGT
Salmonellen
Shigellen
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Latzke Härteprüfung
Active
Kraft (WPM)
Kraftmesseinrichtungen von
Werkstoffprüfmaschinen
nach DIN 51220 *
Acoustics — tonality assessment (DIN 456
+ 3 more
Leadec BV &
Active
Gleichspannung 33 mV
Messgeräte 0,33 V
330 V
Gleichstromstärke 33 µA
Messgeräte 0,33 mA
+ 3 more
Leftfield Environmental
Active
(HSG 248) – 2021
LSOP6 based on HSG 248
(PCM) based on HSG 248
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