Filter Design And Analysis Tool Matlab

Overview

Filter Design Methods

You can implement any of the above windows manually using fir1 or fir2. You can also specify a user-defined window by entering its function name and input parameter.

Additional filter design methods are available to users of the Filter Design 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 filter 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 (freqz)
Group delay (grpdelay)
Impulse response (impz)
Step response (stepz)
Pole-zero plots (zplane)
Zero-phase response (zerophase)

You can also display the filter coefficients, 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.

Im port 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.

If you also have the Filter Design Toolbox installed, two additional panels are available--Set Quantization Parameters and Transform Filter. Use the Set Quantization Parameters panel to

Quantize double-precision filters that you design in FDATool.
Quantize double-precision filters that you import into FDATool.
Analyze quantized filters.

Use the Transform Filter panel to change a filter from one filter type to another.

If you have the DSP Blockset installed, a Realize Model panel is available. Use this panel to create a Simulink block containing the filter structure.

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.