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
1,868 Accredited labs
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SPEKTRA Schwingungstechnik und Akustik GmbH Dresden

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DAkkS D-K-15183-01-02 Dresden, DE
Akustische Messgrößen* Schalldruckpegel (Freifeld), (bezogen au Freifeld-Leerlauf- oder 125 Hz ˃ 250 Hz mit / ohne Windschirm > 8 kHz + 3 more
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SPS electronic

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DAkkS D-K-20497-01-01 Twist, DE
- Gleichspannung Messgeräte 1 mV > 330 mV 3,3 V Messgeräte 0,33 V + 3 more
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SSW Prüfsysteme und Service GmbH Weißberg

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DAkkS D-K-17475-01-00 Hilden, DE
Vibration measuring instruments — test m Vibration measurements near traffic — me Härteprüfmaschinen Acoustics — tonality assessment (DIN 456 Noise measurement on railway vehicles — + 3 more
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ST GOBAIN GLASS France - Saint-Gobain Research Compiègne

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COFRAC 1-1374 Thourotte, FR
DIN EN ISO 10140-1 DIN EN ISO 717-1 DIN EN ISO 10140-2 DIN EN ISO 10140-4 DIN EN ISO 10140-5
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STEARO

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COFRAC 1-7174 Velaux, FR
DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3
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SYNLAB GHANA

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DAkkS D-ML-20424-01-00 Accra, DE
Alpha-Fetoprotein Beta Human Chorionic Gonadotrophin (BHCG), quantitative CA 125 CEA + 3 more
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SYNLAB MVZ Augsburg

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SYNLAB MVZ Weiden GmbH Medizinisches Versorgungszentrum Regensburg

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SYNLAB MVZ Weiden GmbH SYNLAB Medizinisches Versorgungszentrum Nürnberg

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SYNLAB Medizinisches Versorgungszentrum Augsburg

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DAkkS D-ML-13225-01-00 Augsburg, DE
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SYNLAB Medizinisches Versorgungszentrum Berlin

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SYNLAB Medizinisches Versorgungszentrum Ettlingen

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SYNLAB Medizinisches Versorgungszentrum Hamburg

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SYNLAB Medizinisches Versorgungszentrum Heidelberg

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SYNLAB Medizinisches Versorgungszentrum Humangenetik Freiburg

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SYNLAB Medizinisches Versorgungszentrum Humangenetik Mannheim

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SYNLAB Medizinisches Versorgungszentrum Jade-Weser

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DAkkS D-ML-18938-01-01 Varel, DE
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SYNLAB Medizinisches Versorgungszentrum Trier

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SYNLAB Medizinisches Versorgungszentrum Trier GmbH Zweigniederlassung SYNLAB Medizinisches Versorgungszentrum Neuwied

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DAkkS D-ML-13122-02-00 Neuwied, DE
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SYNLAB Medizinisches Versorgungszentrum Weiden

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DAkkS D-ML-13014-01-00 Weiden, DE
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SYNLAB Medizinisches Versorgungszentrum Weiden GmbH Medizinisches Versorgungszentrum Nürnberg

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DAkkS D-ML-13014-02-00 Nürnberg, DE
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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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