Signal Processing Toolbox

Importing a Filter Design

The Import Filter region allows you to import a filter by specifying the filter coefficients, either by entering them explicitly or by referring to variables in the MATLAB workspace. You can access this region by selecting Import Filter from the Filter menu, or by pressing Ctrl+I.

The imported filter can be in any of the representations listed in the Filter Structure menu, and described in Filter Structures below:

• Direct form I
• Direct form II
• Direct form I transposed
• Direct form II transposed
• Direct form II (Second-order sections)
• State-space
• Lattice allpass
• Lattice MA min. phase
• Lattice MA max. phase
• Lattice ARMA
• Quantized filter (Qfilt object) -- available only when Filter Design Toolbox is installed

Select the frequency units from among the following options in the Units menu, and specify the value of the sampling frequency in the Fs field.

To import the filter, press the Import Filter button. The Display Region is automatically updated when the new filter has been imported.

Converting the Filter Structure

Filter Structures