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
🇩🇪 DIN EN ISO 3382-2 🇬🇧 BS EN ISO 3382-2 🇫🇷 NF EN ISO 3382-2 🇮🇹 UNI EN ISO 3382-2 🇪🇸 UNE EN ISO 3382-2 🇳🇱 NEN EN ISO 3382-2 🇩🇪 DIN EN ISO 1996-2 🇬🇧 BS EN ISO 1996-2 🇫🇷 NF EN ISO 1996-2 🇮🇹 UNI EN ISO 1996-2 🇪🇸 UNE EN ISO 1996-2 🇳🇱 NEN EN ISO 1996-2
1,670 Accredited labs
18 Countries

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DAkkS D-K-20506-01-01 Aachen, DE
am Standort DSA Daten- und Systemtechnik Schreibendes Bremsmessgerät (HU-Adapter) Beschleunigung + 1 more
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DAkkS D-PL-14555-02-01 Karlsruhe, DE
ASTM D 3227 DIN 3500 EN 14350-2 DIN EN 12350-9 DIN 53512 + 3 more
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DAkkS D-PL-12098-01-01 Karlsruhe, DE
(SPG42), SPAST (SPG4), SPG11, SPG7, VAMP DIN EN 30-1-1 DIN EN 30-1-2 DIN 13013 DIN 13014 + 3 more
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DAkkS D-PL-17321-01-00 Stuttgart-Untertürkheim, DE
DIN EN ISO 11200 DIN EN ISO 11546-2 DIN 45641 DIN 45645-1 DIN 45645-2 + 1 more
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DAkkS D-K-23327-01-01 Bad Camberg, DE
Metrologic Group GmbH, nalen von: Wernau, D Neuss, D ≤ 1515 mm Wetzlar, D S.p.A., Turin, I + 3 more
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DAkkS D-PL-17009-06-00 Wiesbaden, DE
DIN EN 60950-1 EN IEC 62368-1 DIN EN 60204-1 DIN EN 60825-1 DIN EN 61010-1 + 3 more
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DAkkS D-PL-17009-07-02 Köln, DE
IEC 60335-1: 2010 IEC 60335-2-29 DIN EN 60335-2-29 IEC 60335-2-65 DIN EN 60335-2-65 + 3 more
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BAU

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DAkkS D-PL-17009-09-01 München, DE
DIN 4420-1 DIN 4420-3 DIN EN 61347-1 ISO 12117-2 DIN 53449 + 3 more
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DAkkS D-PL-17009-02-00 Mainz, DE
DIN 31051 DIN EN 1005-1 DIN EN 1993-1-1 DIN EN 1993-1 DIN EN 1993-6 + 3 more
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DAkkS D-PL-17009-01-01 Hamburg, DE
DIN EN ISO 15106-3 DIN EN ISO 1522 DIN 30720-1: 2016-02 DIN 30720-2: 2009-10 DIN 30722-1: 2021-12 + 3 more
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DAkkS D-PL-17009-08-00 Mannheim, DE
DIN EN ISO 11357-4 IEC 61037 DIN EN ISO 13850 DIN EN ISO 13855 ISO 14119 + 3 more
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DAkkS D-K-17009-01-00 Sankt Augustin, DE
Eigenrauschen −60 dB Frequenzbewertung mit akustischen Signalen elektrischen Signalen + 3 more
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DAkkS D-PL-17009-34-00 Sankt Augustin, DE
DIN 58620: 2007-02 DIN 58621: 2011-10 DIN 58647-7: 1997-12 ID136 > 140 + 3 more
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DAkkS D-PL-18020-01-01 Varel, DE
IEC 61400-12 IEC 61400-12-1 IEC 61400-12-2 IEC 61400-12-3 IEC 61400-12-5 + 3 more
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DAkkS D-K-11170-01-00 Hamburg, DE
Railway brakes — conditions for homologa − Durchfluss von Flüssigkeiten − Strömungsgeschwindigkeit von Gasen − Widerstandsthermometer − Temperatur-Transmitter, Datenlogger + 3 more
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DAkkS D-ML-13068-01-00 Berlin, DE
ADP ASPI TRAP Amiodaron, Desethylamiodaron Mycophenolsäure + 3 more
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Diagenom

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DAkkS D-ML-18903-01-00 Rostock, DE
Chromosomensatz (angeboren) Chromosomensatz (erworben) Adrenogenitales Syndrom Angelman-Syndrom (15q11-Region, UBE3A) Mikrodeletionen; AZFa-c) + 3 more
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Diagnos MVZ

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DAkkS D-ML-21150-01-00 Berlin, DE
HbA1c Differentialblutbild, maschinell Retikulozyten, maschinell Kleines Blutbild Thrombozyten + 3 more
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DAkkS D-K-19516-01-00 Ansbach, DE
Volumen strömender 0,0005 m − Durchfluss von Flüssigkeiten 0,025 m Wasserzähler und 0,001 m Durchflusssensoren + 3 more
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DAkkS D-K-20015-01-01 Lahr, DE
Absolutdruck p * Vickers hardness test (ISO 6507) Flüssigkeitsvolumen * variablem Volumen aufnehmern sowie + 3 more
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DAkkS D-ML-13252-01-01 München, DE
Blutbild groß Thrombozyten Urinsediment Natrium Kalium + 3 more
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DAkkS D-ML-19642-02-00 Ronnenberg, DE
Aminosäureprofil Guanidinoacetat Kreatin Hämoglobinprofil Nitisinon (NTBC), Succinylaceton + 3 more
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DAkkS D-K-11250-01-00 Lübeck, DE
Druck * Negativer und positiver Überdruck -0,01 bar Positiver Überdruck p e > 0,015 bar + 3 more
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Duravit

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DAkkS D-PL-21217-01-00 Hornberg, DE
*6095991, BAG3 [OMIM *6038831 (-13910T>C) rs4988235 - PiM rs6647, PiZ rs28929474, rs17580 DIN EN 997 DIN EN 13407 + 3 more
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DAkkS D-PL-12144-01-01 Altdorf, DE
VDE 0468-2-1 VDE 0468-2-2 VDE 0468-2-6 DIN EN IEC 60068-2-11 DIN EN IEC 60068-2-13 + 3 more
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Industries

Audio and sound system design Public address and emergency systems Telecommunications and broadcasting Educational and institutional facilities Aviation and maritime communication

Related Standards

  • ISO 3382-2 Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms
  • ISO 1996-2 Acoustics - Description, measurement and assessment of environmental noise - Part 2: Determination of sound pressure levels
  • EN 60268-1 Sound system equipment - Part 1: General

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