voiceprint

[vois-print]
noun
a graphic representation of a person's voice, showing the component frequencies as analyzed by a sound spectrograph.

Origin:
1960–65; voice + print

voiceprinting, noun
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Collins
World English Dictionary
voiceprint (ˈvɔɪsˌprɪnt)
 
n
a graphic representation of a person's voice recorded electronically, usually having time plotted along the horizontal axis and the frequency of the speech on the vertical axis

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

voiceprint

police technique for identifying individuals by the time, frequency, and intensity of their speech-sound waves. A sound spectrograph is employed to record these waves in the form of a graph that may be compared to graphs of other individuals and differentiated. Though voice graphs (or voiceprints) have been used in courtroom proceedings, the accuracy of this technique in identifying individuals is a subject of controversy among speech scientists.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The company also takes a voiceprint, which can be provided to universities if questions arise later.
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