Utilisation FDATool

Overview :: FDATool: A Filter Design and Analysis GUI (Signal Proces... jar:file:///C:/Program%20Files/MATLAB/R2011a/help/toolbox/signal/hel...

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Overview

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Introduction to FDA Tool

Integrated Products

Filter Design Methods

Using the Filter Design and Analysis Tool

Analyzing Filter Responses

Filter Design and Analysis Tool Panels

Getting Help

Introduction to FDA ToolThe Filter Design and Analysis Tool (FDATool) is a user interface for designing and analyzing filters quickly. FDAToolenables you to design digital FIR or IIR filters by setting filter specifications, by importing filters from your MATLABworkspace, or by adding, moving or deleting poles and zeros. FDATool also provides tools for analyzing filters, such asmagnitude and phase response and pole-zero plots.

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Integrated Products

FDATool seamlessly integrates additional functionality from other MathWorks products as described in the followingtable.

Product Added Features

Filter Design HDL Coder™ Generate synthesizable VHDL or Verilog for fixed-pointfilters

DSP System ToolboxAdvanced FIR and IIR design techniques (see Advanced Filter Design Methods) Filter transformations Multirate filters

Fixed-point filters (available only with SimulinkFixed Point™ product)

Embedded Coder Export code usable by Code Composer Studio™ software

Simulink Generate filters from atomic Simulink blocks

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Filter Design MethodsFDATool gives you access to the following Signal Processing Toolbox filter design methods.

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Design Method Function

Butterworth butter

Chebyshev Type I cheby1

Chebyshev Type II cheby2

Elliptic ellip

Maximally Flat maxflat

Equiripple firpm

Least-squares firls

Constrained least-squares fircls

Complex equiripple cfirpm

Window fir1

When using the window method in FDATool, all Signal Processing Toolbox window functions are available, and you canspecify a user-defined window by entering its function name and input parameter.

Advanced Filter Design Methods

The following advanced filter design methods are available if you have DSP System Toolbox software.


Constrained equiripple FIR firceqrip

Constrained-band equiripple FIR fircband

Generalized remez FIR firgr

Equripple halfband FIR firhalfband

Least P-norm optimal FIR firlpnorm

Equiripple Nyquist FIR firnyquist

Interpolated FIR ifir

IIR comb notching or peaking iircomb


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Allpass filter (given group delay) iirgrpdelay

Least P-norm optimal IIR iirlpnorm

Constrained least P-norm IIR iirlpnormc

Second-order IIR notch iirnotch

Second-order IIR peaking (resonator) iirpeak

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Using the Filter Design and Analysis ToolThere 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 filterdesign methods.You can specify the filter by its type alone, along with certain frequency- or time-domain specifications such aspassband frequencies and stopband frequencies. The filter you design is then computed using the default filterdesign method and filter order.

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Analyzing Filter ResponsesOnce you have designed your filter, you can display the filter coefficients and detailed filter information, export thecoefficients to the MATLAB workspace, and create a C header file containing the coefficients, and analyze different filterresponses in FDATool or in a separate Filter Visualization Tool (fvtool ). The following filter responses are available:

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 )

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

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


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poles and zeros in your filter design.

If you also have DSP System Toolbox product 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 linear and hold interpolators.

If you have Simulink installed, this panel is available:

Realize Model — Use this panel to create a Simulink block containing the filter structure. See Exporting to a Simulink Model for more information.

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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.

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FDATool: A Filter Design and Analysis GUI Opening FDATool

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Utilisation FDATool

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