APx STI Plugin

Size196.79 MB
Create DateApril 7, 2016
Last UpdateMarch 27, 2018

For designers of public address, flight recorder and police/fire/emergency communications systems, the APx Speech Transmission Index (STI) plugin is a software add-on for the APx500 that provides a STIPA measurement and Speech Level measurement conforming to international standard IEC 60268-16 (2011).

Technote 128: Speech Transmission Index Measurement with APx Audio Analyzer


  • The STI plugin is a software option and requires the purchase of an iButton (APX-SW-STI) for measurement functionality. Download and installation of the plugin, without an iButton, enables the measurement in demo mode only.
  • APx STI Plugin v1.1 requires v4.2.1, v4.3 or v4.4.2 of APx500 audio test software. (For versions 4.5 or later of APx500 audio software, please use APx STI v2.0.)
APx STI PluginSetup 1.1
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