6/13/2005
Filter Approximation Theory
3
Definitions
•
Let |H(
w
)|
2
be the approximation to the ideal
low-pass filter response |I(
w
)|
2
•
•
•
•
Where
w
c
is the ideal filter cutoff frequency
(it is normalized to one for convenience)
|I(
w
)|
2
w
/
w
c
1
1