10. The system of claim 9 , wherein the biometric voice analyzer: determines a variation bounds on the personal vocal tract shape; calculates a histogram on the variation bounds; determines a maximum for the histogram; calculates a derivative vector based on the maximum; and calculates a personal histogram and second variation bounds based on the derivative vector.
11. The system of claim 10 , wherein the biometric voice analyzer: evaluates a personal histogram to determine whether a biometric voice print matches one of the plurality of biometric voice prints for verifying an identity of the user, wherein the identify is validated when a first plurality of bins of the personal histogram are filled, and wherein the identity is invalidated when a second plurality of bins of the personal histogram are filled.