6/13/2005
Filter Approximation Theory
4
Definitions - 2
•
|H(
w
)|
2
can be written as
•
•
Where F(
w
) is the “Characteristic Function” which
attempts to approximate:
–
This cannot be done with a finite order polynomial
–
e
provides flexibility for the degree of error in the
passband or stopband.
F(
w
)
w
1
1
¥