Viewing and Annotating the Filter

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Viewing the Filter in FVTool Using FVTool for Annotation

Viewing the Filter in FVTool

This section teaches you how to use the Filter Visualization Tool (FVTool) to view the octave-band filter. It also describes how to annotate your filter.

1. Click the Filter Manager button to display the Filter Manager, which lists your saved filters.

   

2. Press Ctrl+click on each filter name to select all the filters, and then click FVTool. FVTool opens with the filter responses overlaid for easy comparison. (If you want to view a single filter in FVTool, click the Full View Analysis button when that filter is shown in the FDATool display panel or select View > Filter Visualization Tool).

3. Change the x-axis scale to logarithmic by selecting Analysis > Analysis Parameters to display the Analysis Parameters dialog.

4. Change the Frequency Scale to Log.

   

5. Click OK.

   

6. Click the Legend button to turn on the legend, which you can drag to the desired location.

   

7. Click the Legend button again to turn off the legend.

   Use the Zoom button and drag a rectangle around the first few passbands to zoom in.

   

8. Click the Restore Default View button to return to the full view.

9. Display other responses, as desired. (The FVTool Analysis toolbar buttons and Analysis menu are the same as in FDATool. See Analyzing the Filter for descriptions of the buttons.

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Using FVTool for Annotation

FVTool is also useful for doing further analysis, adding annotations, and printing. Available annotations include adding rectangles, text boxes, arrows and lines, and adding data tips.

For a demo about FVTool, type demos at the MATLAB command line, and select Toolboxes. Expand the tree, scroll down, and select Signal Processing Toolbox. Under Filter Design and Analysis, click Filter Analysis using FVTool and its API.

Note   Do not close FDATool at this time. You will use it in future sections.

1. Use the toolbar buttons to annotate your response plot. Add a line by clicking one of the line buttons, and then use your mouse to draw the line on your plot.

2. Add a data tip by clicking on a plot at the desired point. The data tip shows the frequency and magnitude at that point.

   

3. Close FVTool by selecting File > Close.

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Designing Additional Filters

Exporting Filters from FDATool

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