Speech Intelligibility STIPA Option

The XL2 Analyzer, with the STIPA Option installed, measures the speech intelligibility according to the latest revision of standard IEC 60268-16:2020 (edition 5) 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.

The measurement results are acquired from the dedicated STIPA test signal source:

• NTi Audio TalkBox
  Acoustic signal generator, required for audio systems with voice microphones, thus measuring the complete signal chain.
• Minirator MR-PRO
  Test signal generator, required for audio systems with line inputs
• USB Flash Drive
  (included with XL2)

NTi Audio #: 600 000 338

The STI Reporting Tool creates standardized measurement reports. It calculates the effect of the actual ambient noise caused by the public onto the measured speech intelligibility. Thus the tool provides the expected speech intelligibility in STI or CIS during real-life emergency announcements.

Supported standards:

• AS 1670.4
• CEN/TS 54-32:2015
• DIN EN 50849:2017
• IEC 60268-16
• ISO 3382-3
• ISO 7240-19:2007
• VDE V 0833-4-32:2016
• VDE 0828-1:2017-11

System Requirements:

PC running Windows XP, 7, 8 and 10
Excel 2010, 2013 or 2016 (32 bit or 64 bit)