In Voice Biometrics, an individual’s spoken utterance is captured
by the Biometric system and compared with a previously stored voiceprint, and
the result is assigned a score. The voiceprint is an algorithmically
derived model of physical and behavioral characteristics of a speaker’s voice
and its unique digital representation. It is not a recording; nor a set of
words; nor a wave pattern of a voice. It cannot be played back or used for any
other purpose than a comparison with subsequent voiceprints using the same
algorithm.
The algorithm uses more than 100 different calculations to generate
a voiceprint. An adaptation process can be used to track changes to a speaker’s
vocal tract/voice over time as they age, avoiding any need to continuously
update and maintain a voiceprint ‘identity’.
Because
the voiceprint is characterized by the vocal trait (a physiological trait) and
not specifically the sound of the utterance, afflictions that affect the ‘sound’
of a voice; the common cold, for example, do not affect the vocal tract and
don’t have an adverse affect on accuracy levels. If a speaker can provide
enough vocal energy to be heard, enough of their voice will be present for verification.
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