
1) Biometric authentication 2) Biometric identification 3) High-tech id 4) Identity verification 
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https://www.crosswordclues.com/clue/voiceprint

 Voiceprint can refer to the spectrogram of a voice. More specific uses include: ...
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http://en.wikipedia.org/wiki/Voiceprint

Graph produced by a sound spectograph showing frequency and intensity changes in the human voice when visually recorded. It enables individual speech characteristics to be determined. First used as...
Found on 
http://www.encyclo.co.uk/local/20688

voiceprint A set of measurable characteristics of a human voice that uniquely identifies an individual. These characteristics, which are based on the physical configuration of a speaker's mouth and throat, can be expressed as a mathematical formula.  The term applies to a vocal sample recorded for that purpose, the derived mathematical formula, and...
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http://www.wordinfo.info/words/index/info/view_unit/4233/
 noun biometric identification by electronically recording and graphically representing a person`s voice; `voiceprints are uniquely characteristic of individual speakers`
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https://www.encyclo.co.uk/local/20974

Graph produced by a sound spectograph showing frequency and intensity changes in the human voice when visually recorded. It enables individual speech characteristics to be determined. First used as evidence in criminal trials in the USA in 1966, voiceprints were banned in 1974 by the US Court of Appeal as `not yet sufficiently accepted by scie...
Found on 
https://www.encyclo.co.uk/local/21221
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