Digital Signal Processing Reference
In-Depth Information
FIGURE E.2.
Responses of an FIR filter using DigiFilter.
the user can select among several window functions, with the specification of the
number of taps (coefficients) associated with each window (rectangular, Hamming,
etc.). Impulse as well as step responses can also be obtained, as shown in Figure E.2.
Note that an implementation with a Hamming window function would require 89
coefficients, whereas a Kaiser window would require 61 coefficients (Figure E.2).
E.2.2 IIR Filter Design
An IIR filter can readily be designed with the filter package DigiFilter. One
can choose among several designs using the following functions: Butterworth,
Chebyshev, elliptic, and Bessel, each associated with a specific filter order. A plot of
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