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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UTILES Y MAQUINAS INDUSTRIALES, S.A. (UMI)

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ENAC LC10.024 Zamudio, ES
UNE-EN ISO 16859-2 (Método indirecto) UNE-EN ISO 6507-2 ASTM E 92 UNE-EN ISO 6508-2 (Método indirecto) UNE-EN ISO 6506-2 (Método indirecto) + 3 more
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VERIFICACIONES INDUSTRIALES DE ANDALUCIA, S.A. (VEIASA)

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ENAC LC10.112 Sevilla, ES
UNE-EN 60942 UNE-EN 61672-3 UNE 82503 UNE-EN 60804 UNE 20942 + 3 more
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VERIFICACIONES Y CERTIFICACIONES TÉCNICAS

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ENAC LE2110 Castellón de la Plana, ES
UNE-EN ISO 16283-1 UNE-EN ISO 16283-3
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VERIFICACIÓN Y CALIBRACIÓN

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ENAC LC10.251 Hospitalet de Llobregat, ES
CEM ME009
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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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