The optimal listening conditions inside a car compartment are of paramount importance for carmakers, as this is one of the most relevant points in assessing the 'comfort' of the car. Typically, 'sound quality' methods were used for assessing the perceived noisiness and harshness of the background noise without taking into account the effects of internal reflections, echoes and resonances inside the cavity. The parameter that is able to consider all these effects is the Speech Transmission Index (STI): 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. The authors 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. The authors have studied especially the speech level inside cars and they have discovered how the value defined by lEC/ITU standards may be extremely different from real one. In this way, they were able to produce test signals at a more appropriate emission level.
Measurement of active speech level inside cars using throat-activated microphone
2004
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Aufsatz (Konferenz)
Englisch
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