Signal Processing Toolbox

Import Filter Coefficients Region

This 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. (Access this region by selecting Import Filter from the Filter menu.)

Select the desired filter representation from the Filter Structure menu:

• 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

The structure that you choose determines the type of coefficients that you need to specify in the text fields to the right. Follow the links above to learn more about specifying the coefficients.

Select the frequency units from among the following options in the Units menu:

• Hz (default)
• kHz
• MHz
• Normalized (0 to 1)

For Hz, kHz, and MHz, specify the value of the sampling frequency in the Fs field.

Import Filter Tab

Import Filter Coefficients: Direct Form