Acoustic signal generator, required for audio systems with voice microphones, thus measuring the complete signal chain.

Test signal generator, required for audio systems with line inputs

Speech Intelligibility STIPA Option

NTi Audio #: 600 000 338


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.


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