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Forensic speaker identification by Phil Rose

By Phil Rose

A voice is far greater than only a string of phrases. Voices, in contrast to fingerprints, are inherently complicated. They sign loads of details as well as the meant message: the audio system' intercourse, for instance, or their emotional country, or age. even if facts from DNA research grabs the headlines, DNA cannot speak. It cannot be recorded making plans, carrying-out or confessing to a criminal offense. It cannot be so it sounds as if without delay incriminating. probably it truly is those beneficial properties that give a contribution to the curiosity and significance of Forensic Speaker id (FSI)

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Sample text

1 sample contained values measured from 9 different hellos, and MD’s sample 1 contained values from 12 different hellos. 7 thus gives us a more realistic picture of how the three speakers actually differ, at least for these two dimensions on these three occasions. 7 is clear: the mean values for each speaker’s three different occasions differ. 2. 7. 7, samples from many more separate occasions would be required to be confident of having something like the true relationship between them. © 2002 Taylor & Francis Once again, the fewer the samples the less is the strength of evidence for or against common origin.

5 Architecture of observation data in forensic speech samples 23 © 2002 Taylor & Francis the values of the population they are taken from (Elzey 1987: 42), we can in fact estimate the true population values from large samples taken from it. It may or may not be the case that the questioned source and the suspect source are the same. If the former, the suspect is the offender; if the latter, the suspect is not the offender. In reality, either the questioned source and the suspect source are the same, or they are not.

Then samples from two voices that in reality differed a lot would appear not to differ so much. It was pointed out above that there will always be differences between forensic speech samples. These differences can be small, however, either because pre-existing differences have been excluded or distorted or because the voices from which they were taken were indeed similar in the first place. Two samples, therefore, whether they come from different speakers or the same speaker, cannot get any closer than minimally © 2002 Taylor & Francis different, whereas there is no upper limit on the amount by which two samples can differ.

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