Using the Filter Design and Analysis Tool :: FDATool: A Filter Design and Analysis GUI (Signal Processing Toolbox)

Signal Processing Toolbox

Using the Filter Design and Analysis Tool

There are different ways that you can design filters using the Filter Design and Analysis Tool. For example:

You can first choose a response type, such as bandpass, and then choose from the available FIR or IIR filter design methods.
You can specify the filter by its type alone, along with certain frequency- or time-domain specifications such as passband frequencies and stopband frequencies. The filter you design is then computed using the default filter design method and filter order.

Analyzing Filter Responses

Once you have designed your filter, you can analyze different filter responses in FDATool or in a separate Filter Visualization Tool (fvtool). See Analyzing the Filter for more information:

Magnitude response (freqz)
Phase response (phasez)
Group delay (grpdelay)
Phase delay (phasedelay)
Impulse response (impz)
Step response (stepz)
Pole-zero plots (zplane)
Zero-phase response (zerophase)

You can also display the filter coefficients and detailed filter information, export the coefficients to the MATLAB workspace, and create a C header file containing the coefficients.

Filter Design and Analysis Tool Panels

The Filter Design and Analysis Tool has sidebar buttons that display particular panels in the lower half of the tool. The panels are

Design Filter. See Choosing a Filter Design Method for more information. You use this panel to

Design filters from scratch.
Modify existing filters designed in FDATool.
Analyze filters.

Import filter. See Importing a Filter Design for more information. You use this panel to

Import previously saved filters or filter coefficients that you have stored in the MATLAB workspace.
Analyze imported filters.

Pole/Zero Editor. See Editing the Filter Using the Pole/Zero Editor. You use this panel to add, delete, and move poles and zeros in your filter design.

If you also have the Filter Design Toolbox installed, additional panels are available:

Set quantization parameters--Use this panel to quantize double-precision filters that you design in FDATool, quantize double-precision filters that you import into FDATool, and analyze quantized filters.
Transform filter--Use this panel to change a filter from one response type to another.
Multirate filter design--Use this panel to create a multirate filter from your existing FIR design, create CIC filters, and and linear and hold interpolators.

If you have Simulink^® installed, a Realize Model panel is available. Use this panel to create a Simulink block containing the filter structure. See Exporting to Simulink for information.

Getting Help

At any time, you can right-click or click the What's this? button, , to get information on the different parts of the tool. You can also use the Help menu to see complete Help information.

Overview Opening FDATool