User`s guide

Filters
4-5
For details about a particular block, consult its reference page. Also see the rest
of this section, which discuss the following topics in detail:
•“Designing Digital Filters with Direct-Form II Transposed Structures” on
page 4-5
•“Designing Filters with Various Filter Structures” on page 4-6
•“Designing Continuous-Time Classical IIR Filters” on page 4-7
Designing Digital Filters with Direct-Form II Transposed Structures
The Digital Filter Design block in the Filter Designs library integrates the
Filter Design and Analysis Tool (FDATool) graphical user interface with the
DSP Blockset. Double-licking this block opens the FDATool GUI, which you
can use to quickly design, import, or directly specify the coefficients of a digital
FIR or IIR filter. Using these coefficients, the block filters the input signal and
outputs the result within Simulink.
To design a filter in FDATool, you enter the desired filter response
characteristics, such as cutoff frequency and bandwidth. You can also enter the
filter coefficients directly. As soon as you apply your filter changes in FDATool,
the Digital Filter Design block automatically updates to implement the filter.
To learn more about the Digital Filter Design block, see the Digital Filter
Design block reference page. To learn how to use FDATool, see the FDATool
section of the Signal Processing Toolbox documentation.