MATLAB SIGNAL PROCESSING TOOLBOX 6 Manuel d'utilisateur télécharger pdf (Page 36)

3 Design a Filter with fdesign and filterbuilder

3-8

Design a Filter Using filterbuilder

Filterbuilder presents the option of designing a filter using a GUI dialog box as opposed

to the command line instructions. You can use Filterbuilder to design the same bandpass

filter designed in the previous section, “Design a Filter Using fdesign” on page 3-3

Design a Simple Filter in Filterbuilder

To design the filter using the Filterbuilder GUI:

Type the following at the MATLAB prompt:

filterbuilder

Select Bandpass filter response from the list in the dialog box, and hit the OK

button.

Enter the correct frequencies for Fpass2 and Fstop2, then click OK. Here the

specification uses normalized frequency, so that the passband and stopband edges

are expressed as a fraction of the Nyquist frequency (in this case, 48/2 kHz). The

following message appears at the MATLAB prompt:

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

If you display the Workspace tab, you see the object Hbp has been placed on your

workspace.

To check your work, plot the filter magnitude response using the Filter Visualization

tool. Verify that all the design parameters are met:

fvtool(Hbp) %plot the filter magnitude response

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Manuel d'utilisateur Page 36