Designing a FIR Filter Using filterbuilder

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FIR Filter Design

FIR Filter Design

Example – Using Filterbuilder to Design a Finite Impulse Response (FIR) Filter

To design a lowpass FIR filter using filterbuilder:

1. Open the Filterbuilder GUI by typing the following at the MATLAB prompt:

   filterbuilder

   The Response Selection dialog box appears. In this dialog box, you can select from a list of filter response types. Select Lowpass in the list box.

   

2. Hit the OK button. The Lowpass Design dialog box opens. Here you can specify the writable parameters of the Lowpass filter object. The components of the Main frame of this dialog box are described in the section titled Lowpass Filter Design Dialog Box — Main Pane. In the dialog box, make the following changes:

   • Enter a Fpass value of 0.55.

   • Enter a Fstop value of 0.65.

   

3. Click Apply, and the following message appears at the MATLAB prompt:

   The variable 'Hlp' has been exported to the command window.

4. To check your design, click View Filter Response. The Filter Visualization tool appears, showing a plot of the magnitude response of the filter.

   

   You can change the design and click Apply, followed by View Filter Response, as many times as needed until your design specifications are met.

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The Graphical Interface to Fdesign

FDATool: A Filter Design and Analysis GUI

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