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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DAkkS D-ML-19241-01-00 Hamburg, DE
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Labor Heidrich & Kollegen MVZ

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DAkkS D-ML-13201-03-01 Hamburg, DE
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DAkkS D-ML-18018-01-00 Kiel, DE
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hCG (qualitativ) Freie Fettsäuren gamma-Linolensäure, Arachidonsäure (AA) Katecholamine VMS, 5-HIES, HVS + 3 more
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Labor von Froreich

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DAkkS D-ML-13298-01-01 Hamburg, DE
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Labor für Wasser und Umwelt

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DAkkS D-PL-14586-01-02 Bad Liebenwerda, DE
DIN 38402-A 11 DIN 38402-A 12 DIN 38402-A 13 DIN ISO 5667-5 (A 14) DIN EN ISO 5667-6 (A 15) + 3 more
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Labor:Medizin Krefeld Medizinisches Versorgungszentrum

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DAkkS D-ML-19493-02-00 Krefeld, DE
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LaborZentrum Weser Franz-Josef Schmitz

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DAkkS D-ML-13273-01-00 Minden, DE
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Laborarztpraxis med. S. Wehrenfennig

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DAkkS D-ML-17683-01-00 Darmstadt, DE
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DAkkS D-ML-13243-01-00 Georgsmarienhütte, DE
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DAkkS D-ML-13243-01-01 Georgsmarienhütte, DE
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COFRAC 1-7427 Launaguet, FR
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COFRAC 1-1157 Bonneuil Sur Marne, FR
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COFRAC 1-1810 Vesoul, FR
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COFRAC 1-0536 Arras Cedex, FR
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COFRAC 1-1756 Saint Denis, FR
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Laboratoire Départemental d'Analyses de Seine-et-Marne (LDA 77)

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COFRAC 1-1140 Dammarie Les Lys, FR
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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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