The short-time magnitude of the signal is found and recorded,
as is the pitch track.
Rate Adjustment to Speaker's Stored Password Signal
Each is cropped and dynamically time warped so that (possible)
corresponding points on the signals are aligned.
Filtering to Compare Input Signal and Speaker's Stored Password
Signal
Now that the signals rest on top of each other, a matched filter
(for both magnitude and pitch) to determine a numerical value
for their correlation. These numbers are compared to the thresholds
set when the key was first created. If both the magnitude and
pitch correlations are above this threshold, the speaker has been
verified. Allow user to enter top-secret hangout.