Audio Precision, the authority in 21ic audio and audio testing, today announced the addition of the Language Transfer Index (STI) plug-in to the APx500 audio test software. The Apx500 STI plug-in is designed for development engineers in public safety (police, fire, emergency) communications, public address systems, flight recording equipment, and has measurement capabilities in accordance with international standard IEC 60268-16 (2011).
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Quantify speech intelligibility
STI quantifies the speech intelligibility of different transmission media (such as rooms, intercom systems, radio lines) and can objectively rate the language between 0 and 1 to predict syllables and words transmitted on a particular medium. Whether the sentence is easy to understand. Ratings include “poor†(0–0.36) to “excellent†(0.75-1.0).
Among the four direct measurement methods described in IEC 60268-16 (2011), the Apx500 STI plug-in uses the most commonly used STIPA (Public Broadcast Language Transmission Index) technology. STIPA uses 14 modulation frequencies out of 7 octave bands, each band modulating with two frequencies, all bands and frequency combinations being included in one signal. Using this signal for a single measurement, the total time required to measure is 10-20 seconds. The STIPA method is very similar to the “full STI†method, which is the most comprehensive measurement method in the standard. The STIPA measurement time is approximately 15 seconds, while the "full STI" takes approximately 15 minutes.
Combine audio, electroacoustic, and STI measurements
With APx500 STI measurement software, developers can use AP's state-of-the-art measuring instruments to verify the STI performance of their designs, and the same equipment can be used for other audio and electroacoustic tests. Once the plug-in is installed, the STIPA measurement function can be easily added to any measurement sequence. In addition, to properly adjust the STIPA signal level, the plug-in includes voice level measurement in accordance with IEC 60268-16 Annex J.
Dave Schmoldt, CEO of Audio Precision, said: "With the release of the APx500 STI plug-in, system developers now have a lab-quality tool to validate the STI performance of their design products. Powerful, unbeatable, available for electronics Audio and electro-acoustic testing, including 16 input channels, multiple digital interfaces, and a very intuitive user interface."
Ordering Information
From now on, users can order STI options or order APX-SW-STI upgrades with the APx500 Analyzer Series. For a demo version of the APx500 STI, go to http:// to download it.
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