Signal Processing Toolbox

Converting to Second-Order Sections

You can use Convert to Second-order Sections on the Edit menu to store the converted filter structure as a collection of second-order sections rather than as a monolithic higher-order structure.

Note    The following options are also used for the Edit menu Order and Scale SOS, which you use to modify an SOS filter structure.

The following Scale options are available when converting a direct-form II structure only:

• None (default)
• L-2 (L² norm)
• L-infinity (L norm)

The Direction (Up or Down) determines the ordering of the second-order sections. The optimal ordering changes depending on the Scale option selected.

For example:

• Select Convert to Second-order Sections from the Edit menu to open the Convert to SOS dialog box.
• Select L-infinity from the Scale menu for L norm scaling.
• Leave Up as the Direction option.

Note    To convert from second-order sections back to a single section, use Convert to Single Section on the Edit menu.

Converting the Filter Structure

Importing a Filter Design

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