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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Applus Netherlands
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DIN EN 16407-1
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ÖNORM EN ISO 17636-1
NEN-EN 12732
ÖNORM EN ISO 17636-2
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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
Buro Blauw Luchtkwaliteit
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DIN EN ISO 21877
DIN EN ISO 16911-1
DIN EN 13284-1
NEN 2826
DIN EN 14789
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DEKRA Certification
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DIN EN 60076-3
DIN EN 60076-10
DIN EN 60076-1
DIN EN 60076-4
DIN EN 60076-11
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Efectis Nederland
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ISO 5660-1
DIN EN 1365-1
EN 13381-4
DIN EN 1634-1
EN 1365-2
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BS ISO 11338-1:2003
NEN-ISO 10849
DIN EN ISO 16911-1
IS EN 1948-1:2006 2006
BS ISO 9096:2017
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FlexSpect
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#EN ISO 5164:14
# EN 116-97
#ISO 12185
NEN 4400-2
# ISO 13736
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Intertek Polychemlab
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DIN EN ISO 10675-1
DIN EN ISO 19458
DIN EN ISO 179-1
NEN 6953
DIN EN ISO 10675-2
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Kalibra International
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HCS LF 6 2
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Kiwa Assurance
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EN ISO 11925-2
DIN EN ISO 13162
DIN EN 14509
DIN EN ISO 13163
DIN EN 1604
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Kiwa Nederland
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ISO 2781
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ISO 6259-1:2015
ISO 6259-3
ISO 6259-2:1997
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NORMEC QS
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NEN-EN 13361
ISO 13362
NEN-EN 13491
DIN EN 13493
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Navobi
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AM09 based on BS ISO 21527-1:
07L.1.11 based on ISO 5984:2002
DIN EN ISO 11290-2
ISO 4833-1
DIN EN ISO 8968-1
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Normec VRO
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#EN ISO 5164:14
# EN 116-97
NEN 4400-1
# ISO 13736
#ISO 6618
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Olfasense
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DIN EN ISO 16911-1
ISO 10780
DIN EN 13725:2003-07 und Berichtigung
AG2 and IS EN 15259:2007
ISO 11819-1
(N 2 O) 0,000008
DIN EN ISO 16911-1
AG2 and IS EN 15259:2007
DIN EN 14790
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ETSI EN 301 489-1 V2.2.3 2019-11
ASTM D4157-13
BS ISO 11338-1:2003
DIN EN ISO 16911-1
NEN-EN 14791 2
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