User`s manual

30
In this window, you can make the entire filter curve drop by a specified amount prior to editing
the curve. This can be used to create headroom which can be used to increase the gain
(decrease the attenuation) in one portion of the curve relative to the rest of the curve. For
now, select a drop of 0dB (No Drop) and click on Proceed.
7. You should now notice that all the buttons on the control window have been replaced with a
single Abort button, which permits returning to the pre-Edit filter.
To edit out the dip, you will first need to define the edit region by carefully specifying the left
and right edges of the portion of the filter curve that you wish to modify. Click your mouse to
the left and to the right of the dip to produce the following display:
Figure 7-22: Spectral Graphic Define Edit Region
8. Now, draw in the new portion of the filter curve using mouse clicks as in Step 4, above,
roughly as shown below.
Figure 7-23: Spectral Edit In Progress
9. Complete drawing the new portion of the filter curve as shown below by drawing points all the
way to the right edge of the edit region:
Figure 7-24: Completed Spectral Graphic Edit
When you have drawn the last point (must be at or beyond the right edge of the edit region),
the mouse cursor will change to an "hourglass" shape for a few seconds while the filter is
being recalculated. When the calculations are complete, the mouse cursor and the buttons in
the Spectral Graphic control window will return to normal appearance.
10. Normalizing the filter places the highest point on the filter curve at 0 dB. Doing so minimizes
loss in the filter and preserves system dynamic range. Now normalize the filter curve to 0dB
by clicking the Normalize button. You should see the mouse cursor change to the
"hourglass" shape for a few seconds; when the normalization calculations are complete, the
filter shape should appear as follows: