Package for speech intelligibility STI STIPA

With this package you can measure speech intelligibility STI STIPA  according to IEC 60268-16. Our system supports measurements via impulse response and modulated noise. Introduction Speech-intelligibility is the key feature to human communication. For evacuation systems, telecommunication, announcement systems (e.g. train stations) or rooms for education, poor speech-intelligibility will degrade their function or even become a security issue. In many countries there exist limits for the speech-intelligibility. For new public buildings a certification measurement is required and the speech-intelligibility results must be documented. In most cases this must be performed according to IEC 60849 or ISO 7240-16. The first orginal measurements were based on statistical analysis of listening tests. In contrast, the STI-method specified in DIN/IEC 60268-16 is an objective method. It uses special test signals (modulated noise) that simulate human voice and computes the influence of a transmission channel which degrades the speech-intelligibility. The speech intelligibility of a transmission channel depends on: the speech level frequency response of the channel non-linear distortions background noise level quality of the sound reproduction equipment echos (reflections with delay > 100ms) the reverberation time psychoacoustic effects (masking effects) The STI method uses 7 octave bands in the range of 125Hz to 8000Hz. It computes a single value, that reflects the speech-intelligibility.This value can be in the range of  0 to 1.0. A value of 0 is equivalent to a very poor speech-intelligibility. 1.0 is an ideal channel with excellent speech transmission. Features of our STIPA measurement system Conforms to IEC 60268-16 ED5 Measures STI, STIPA Very easy usage. Make your first STIPA measurement within 2 min. Measurement via modulated noise and room impulse response. (direct and indirect method) Background noise can be included via spectral values or .wav file. No spreadsheet calculation required. Auditory masking conforms to IEC 60268-16 ED 3.0 (2003) and ED 4/5 Displays modulation indices for each band Octave analyzer Speech level measurement according to IEC 60268-16 Annex J.2 Easy export of data   You can find the quick guide here   This package includes Software PRO EX Plug-in  speech intelligibility (STI-STIPA) 1/2" USB measurement microphone Microphone cable 3m Audio CD with STI-PA signals A PC/Notebook is not included. Options Active loudspeaker with 10cm diaphragma Sound level calibrator RASTI is available in the Akulap product line