How does Voice Recognition work?

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Voice recognition identifies individuals based on their unique vocal characteristics, distinguishing them from speech recognition, which focuses on understanding words. This process involves analyzing specific features of a person's voice, such as pitch and tone, which are influenced by their vocal tract and speaking habits. Techniques like Fast Fourier Transform (FFT) can be employed to capture key frequencies and magnitudes of a voice for comparison. The complexity arises from the need to account for variations in speech mannerisms among individuals. Understanding these principles can enhance the accuracy of voice recognition systems.
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How does Voice-Recognition work? Not, Speech recognition but voice. Like I would know Justin Bieber's voice without seeing his face. Like if he had a new song and I did not know about it and I heard it in the car while driving, I would know that it was Justin Bieber. How does that work ? I looked it up on Google but I am getting sites about Speech recognition.

would you just use a fft and save the key frequencies and magnitudes?
and then compare it , every time a person talks ?
 
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Frustrating isn't it, the search.

Apparantly no two people have the same manner of speaking, since for one thing, their vocal tracts are different and speech mannerisms also.
Wiki has bit on it
http://en.wikipedia.org/wiki/Speaker_recognition
 

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