One of the most used intelligibility?s parameters is Speech Transmission Index : the techniques for determining it employ an artificial speaker and listener. When signal to noise ratio is particularly low, for example inside cars, the value of STI is mainly influenced by this ratio and measuring the emission level of real speakers is the only way for driving correctly the artificial mouth. We have implemented a technique that is based on a throat-activated microphone and it is able to find the effective level of a real speaker?s voice inside a noisy space in realistic conditions. We have studied especially the speech level inside cars and we have discovered how the value defined by IEC/ITU standards may be extremely different from real one. In this way, we were able to produce test signals at a more appropriate emission level
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