Phase Response
Definition: The phase response of a filter is defined as
the phase of its frequency response:



![$\displaystyle \angle{Y(\omega_k)} = \angle{\left[H(\omega_k)X(\omega_k)\right]}...
... \angle{H(\omega_k)} + \angle{X(\omega_k)}
= \Theta(k) + \angle{X(\omega_k)}.
$](http://www.dsprelated.com/josimages_new/mdft/img1549.png)
The topics touched upon in this section are developed more fully in the next book [68] in the music signal processing series mentioned in the preface.
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