SPECTRAL MATCHING INTERPRETATION
Recall that the LP model uses mean-square error approach to optimize its coefficients. This implies:

• The LP model attempts spectral flatten the error signal.
  
  
• The LP model focuses on the extremely high or low energy areas of the spectrum - whatever it takes to makes the error signal spectrum as flat as possible. Example:
• Note that the eighth-order analysis models the floor of the spectrum more precisely than the third formant.