Scope
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
๐ฉ๐ช
DIN EN ISO 3382-2
๐ฌ๐ง
BS EN ISO 3382-2
๐ซ๐ท
NF EN ISO 3382-2
๐ฎ๐น
UNI EN ISO 3382-2
๐ช๐ธ
UNE EN ISO 3382-2
๐ณ๐ฑ
NEN EN ISO 3382-2
๐ฉ๐ช
DIN EN ISO 1996-2
๐ฌ๐ง
BS EN ISO 1996-2
๐ซ๐ท
NF EN ISO 1996-2
๐ฎ๐น
UNI EN ISO 1996-2
๐ช๐ธ
UNE EN ISO 1996-2
๐ณ๐ฑ
NEN EN ISO 1996-2
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Specific Values 1 ๏
RF Power
RF Attenuation 10 MHz to 1 GHz
Other values -20 dBm to +20 dBm
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