DSP Blockset

Overview of the Digital Filter Design Block

Filter Design and Analysis.   You perform all filter design and analysis within the Filter Design and Analysis Tool (FDATool) GUI, which opens when you double-click the Digital Filter Design block. FDATool provides extensive filter design parameters and analysis tools such as pole-zero and impulse response plots.

Filter Implementation.   Once you have designed your filter using FDATool, the block automatically realizes the filter using the filter structure you specified. You can then use the block to filter signals in your model. You can also fine-tune the filter by changing the filter specification parameters during a simulation. The outputs of the Digital Filter Design block numerically match the outputs of the filter function in the Filter Design Toolbox and the filter function in the Signal Processing Toolbox.

Saving, Exporting, and Importing Filters.   The Digital Filter Design block allows you to save the filters you design, export filters (to the MATLAB workspace, MAT-files, etc.), and import filters designed elsewhere.

To learn how to save your filter designs, see the Saving and Opening Filter Design Sessions section of the Signal Processing Toolbox documentation. To learn how to import and export your filter designs, see the Importing and Exporting Quantized Filters section of the Filter Design Toolbox documentation.

Note    Use the Digital Filter Design block to design and implement a filter. Use the Digital Filter block to implement a predesigned filter. Both blocks implement a filter design in the same manner and have the same behavior during simulation and code generation.

See the block reference page, Digital Filter Design, for more information. For information on choosing between the Digital Filter Design block and the Filter Realization Wizard, see Choosing Between Filter Design Blocks.

Digital Filter Design Block

Choosing Between Filter Design Blocks