Amplitude Response
Definition. The amplitude responseof an LTI filter is defined as the magnitude (or modulus) of the (complex) filter frequency response
, i.e.,
![$\displaystyle \zbox {G(\omega) \isdefs \left\vert H(e^{j\omega T})\right\vert.}
$](http://www.dsprelated.com/josimages_new/filters/img842.png)
The real-valued amplitude response specifies the amplitude
gain that the filter provides at each frequency
.
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Frequency Response