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  4. NTI Speech Intelligibility STI-PA Option Pack XL2-STI-PA
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NTI Speech Intelligibility STI-PA Option Pack XL2-STI-PA
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NTI Speech Intelligibility STI-PA Option Pack XL2-STI-PA

Product Code: 745040

Speech intelligibility is measured by playing a known signal (the STIPA test signal) through the PA and measuring the quality of that signal as it reaches each of the measurement positions.

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NTI Speech Intelligibility STI-PA Option Pack (Part number: XL2-STI-PA)

Factors that influence the intelligibility of speech are the signal-to-noise ratio (quality of the system), sound pressure level (loud enough but not too loud), ambient noise level (crowds or passing traffic), reverberation time RT60 (sound reflects off smooth surfaces; we need some reflections but not too many) and psychoacoustic masking effects (the announcement is masked by another louder sound).
The XL2 Analyzer, with the STIPA Option installed, measures the speech intelligibility according to the latest revision of standard IEC 60268-16:2011 (edition 4) and older editions. It offers ambient noise correction and automated averaging for repeated measurements. The XL2 displays the speech transmission index (STI) and the common intelligibility scale (CIS), accompanied by the individual levels and modulation indices of the seven octave bands.




  • Standards: IEC60268-16 (edition 2, 3 and 4), ISO 7240-16, ISO 7240-19, DIN VDE 0828-1, DIN VDE 0833-4
  • Ambient Noise Correction
  • Automated Averaging
  • Display of Modulation Indices
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