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
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Olfasense

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DAkkS D-PL-17433-01-00 Kiel, DE
DIN EN 13725:2003-07 und Berichtigung DIN ISO 16000-28 DIN EN ISO 16000-9 DIN EN ISO 16000-11 VDA 270
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Olfasense UK

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UKAS 2430 Bristol, GB
IEC 60519-11 BS EN BS EN ISO 21877:2019 DIN EN ISO 16911-1 Standard and BS EN 15259:2007 DIN EN 13126-19 + 3 more
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Omgevingsdienst Midden- en West-Brabant

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RvA I073 Tilburg, NL
ISO 11819-1 (N 2 O) 0,000008 DIN EN ISO 16911-1 AG2 and IS EN 15259:2007 DIN EN 14790 + 3 more
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Omgevingsdienst Regio Arnhem (ODRA)

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RvA I168 Arnhem, NL
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 + 3 more
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One Scientific

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UKAS 2048 Avonmouth, GB
ISO 6888-1 ISO 21528-2 BS ISO 4832:2006 ISO 4833-1 ISO 6579-1 + 3 more
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Open Grid Europe GmbH Technologiezentrum Gasqualität

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DAkkS D-PL-14154-01-01 Essen, DE
ISO 6974-1 ISO 6974-2 ISO 6974-6 ISO 6975 DIN EN 12697-5 + 3 more
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Optical Test & Calibration

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UKAS 0286 Bradford, GB
DC Resistance DC CURRENT DC VOLTAGE DC RESISTANCE (cont’d)
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Oracle Solutions Asbestos

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UKAS 4600 Kettering, GB
(HSG 264, 2012)
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Ostthüringische Materialprüfgesellschaft für Textil und Kunststoffe mbH Rudolstadt

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DAkkS D-PL-11118-01-01 Rudolstadt, DE
DIN EN 1264-5 DIN EN 13647 DIN EN 71-10 DIN EN 50642 DIN EN ISO 14184-2 + 3 more
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PA Group (UK)

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UKAS 4265 Dartford, GB
(HSG 264, 2012)
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PETROLAB GmbH Laboratorium für Mineralöl- und Umweltanalytik

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PHH Environmental (UK)

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HSG 227 (2004)) (HSG 264, 2012) HSG 264 (2012) and Appx. 3 of (HSG 248) – 2021 (PCM) based on HSG 248
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PMK - GmbH (Prüfen+Messen+Kalibrieren)

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PPT

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DAkkS D-K-20121-01-01 Freiburg im Breisgau, DE
Kraft Zug- und Druckkraft 0,4 N·m Längenänderungsmessein Parallelendmaße * 0,5 mm + 3 more
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PRECOVER ACÚSTICA Y MEDIO AMBIENTE, S.L.P.

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ENAC LE1844 Valencia, ES
UNE-EN ISO 140-5 UNE-EN ISO 16283-3 UNE-EN ISO 16283-2 UNE-EN ISO 140-7 UNE-EN ISO 3382-2 + 2 more
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PRODUCTOS AGROVIN

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ENAC LE2092 Alcázar de San Juan, ES
UNE-EN ISO/IEC 17025
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PROGRESS

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ACCREDIA 00475 Milano, IT
DIN EN 13725:2003-07 und Berichtigung
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PROMESS Gesellschaft für Montage- und Prüfsysteme

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DAkkS D-K-21209-02-00 Berlin, DE
Railway brake — magnetic track brakes (U − Kraft (WPM) nur Vor-Ort-Kalibrierungen Kraft (WPM) 0,1 kN Vibration measuring instruments — test m + 3 more
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PRS LAB srl Unipersonale - Sede di Faloppio

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ACCREDIA 00983 Faloppio, IT
IEC 60730-1: 2013 DIN EN 60730-2-8 IEC 61000-6-1 DIN EN 50131-2-3 DIN EN 60730-2-9 + 3 more
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PTS - Institut für Fasern & Papier g

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DAkkS D-PL-23019-01-01 Heidenau, DE
rs11887534 HABP2-Gen (c.1601G>A) rs7080536 IEC 61924-2 DIN EN ISO 1974 DIN 53121 + 3 more
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PTW - Freiburg Physikalisch-Technische Werkstätten Pychlau

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PZT

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DIN EN ISO 10256 prEN 50365 DIN EN ISO 21420 DIN EN ISO 3741 DIN EN ISO 13688 + 3 more
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Paragon Scientific

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UKAS 0649 Prenton, GB
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Particle Technology

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UKAS 4109 Hatton, GB
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Partnerschaftspraxis für Laboratoriumsmedizin und Mikrobiologie

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Hämoglobin Selen Lithium Zink Eisen, Kupfer + 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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