Italian monozygotic twins’ speech
A preliminary forensic investigation
Keywords:speaker recognition, monozygotic twins, normalization, formants, between-speaker variability
In this study, we investigate whether it is possible to distinguish a speaker from his twin in low quality audio recordings. An analysis of both qualitative and quantitative data was conducted to compare the speech of 4 pairs of Italian twins (2F, 2M). The distributions of fundamental frequency and formants were similar across twin pairs, but Lobanov’s normalization allowed a differentiation of twins’ speech, especially in the elicited form. The statistical analysis confirmed these outcomes and highlighted some differences and the role of F3. The results are discussed in a forensic perspective. Further experiments will widen the sample and the features of interest to determine if this methodology represents a valid procedure for twins’ speech discrimination.
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