CLIO 11 now implements, under the Acoustical Parameters menu, the calculation of STIPA according to the indirect method as per IEC 60268-16:2011 standard.
STIPA is a simplified version of the complete STI (Speech Transmission Index) measurement tailored for Public Address sound systems.
The following application note details the procedure:
Speech Intelligibility Assessment Using CLIO 11
(Application Note 13 – by D.Ponteggia – 1MB)