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
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ISO 23351-1
ASTM E 1354
DIN EN ISO 717-1
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DIN EN ISO 3382-1
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Alleima
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DIN EN ISO 6506-1
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DIN EN ISO 6508-1
ASTM E 18-22
DIN EN ISO 6507-1
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Durchmesser 1 mm
510 mm
Rundheitsabweichung 1 mm
Parallelitätsabweichung
Rundheitsabweichung
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DIN EN ISO 54321
DIN EN 1744-3
DIN EN 12457-2
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1) In den CMC sind die erweiterten Messu
Ashcroft Instruments
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Absolutdruck p abs 0,015 bar
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> 42 bar
Absolutdruck Pabs
1 bar; 2 bar
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DIN 55635
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DIN EN 12390-1
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DIN EN 12390-3
DIN EN 12390-5
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DIN 52186
ISO 21527-1
DIN EN ISO 527-3
IEC 61924-2
DIN EN 62233
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DIN EN ISO 22854
(LBLS) (OMIM 611105) (c.228-
DIN EN 13016-1
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Sound intensity — scanning method (ISO 9
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Railway freight wagon brake system requi
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Bax Engineering
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–100 °C bis
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verwendete Abkürzungen:
Salmonella spp.
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Treponema pallidum (Lues)
Thrombozytäre Antikörper
dysenteriae), Vibrio cholerae
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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
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Großes Blutbild
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