Download Forensic speaker identification by Phil Rose PDF

By Phil Rose

A voice is way greater than only a string of phrases. Voices, not like fingerprints, are inherently advanced. They sign loads of details as well as the meant message: the audio system' intercourse, for instance, or their emotional nation, or age. even supposing facts from DNA research grabs the headlines, DNA cannot speak. It cannot be recorded making plans, carrying-out or confessing to against the law. It cannot be so it sounds as if at once incriminating. might be it truly is those positive factors that give a contribution to the curiosity and value of Forensic Speaker id (FSI)

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This is therefore a further restriction often imposed from the real-world situation, and the question of to what extent questioned/unknown forensic speech samples can legitimately be pooled is an important one that must always be addressed. Chapter summary Forensic speaker identification is about attempting to discriminate between samespeaker and different-speaker voice samples. Voices are characterisable in an exceedingly large number of dimensions, and, because it is likely that they occupy separate regions in multidimensional speaker space, it is also likely that speakers of a given language all have different voices.

Sample number, dimension number, and dimension size are explained below. Sample number Let us assume that four speech samples are available: two of the offender, call these the questioned samples, and two of the suspect, the suspect samples. 5 symbolises these speech samples, marked ‘Speech Sample Q(uestioned)’ 1 and 2, and ‘Speech Sample S(uspect)’ 1 and 2, as having come from the questioned and suspect sources respectively. The number of speech samples for each source is called the sample number.

An improvement in discrimination performance will only happen if the dimensions are not strongly correlated, otherwise the same discrimination performance occurs with two well-correlated dimensions as with one. 3, it can be seen that there is in fact a certain degree of correlation, since the second dimension increases as the first increases. The question of correlation between dimensions is an important one, to be examined in greater detail later. 3 shows two configurations typical for voice comparison: that one pair of speakers can be well separated in dimension 1 but not in dimension 2, whereas another pair might be well separated in dimension 2 but not in dimension 1.

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