| Open the approximation window either by click on "Filter" - "Approximation" or by the toolbar. |
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Start/Stop: Define the start and stop frequency for a desired stopband. |
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Goal: Define the absorbability for the chosen frequency range. |
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Type: Choose the type of the goal. |
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Add/Remove Goal: This two buttons allow to add and remove stopbands and passbands to and from the list on the right. |
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Solve Approximation: With the Solve Approximation button the optimal solution for the specification will be found. |
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| Note: The defined stopbands and passbands are displayed in blue and red in the graph, respectively. |
