Filter Design Toolbox

Using FDATool with the Filter Design Toolbox

Switching FDATool to Quantization Mode	After you open FDATool, this section explain how to access the quantization features in the tool.
Quantizing Filters in the Filter Design and Analysis Tool	Explains how you quantize a filter in FDATool.
Analyzing Filters with the Noise Loading Method	FDATool provides a variety of analysis methods for quantized filters; this section explains how to use them.
Optimizing the Quantization Process For Your Filter	You can adjust the way FDATool quantizes filters. To learn how, read this section.
Importing and Exporting Quantized Filters	Shows you how to import and export filters to and from your MATLAB workspace, as well as to other destinations.
Transforming Filters	Describes how you use the filter transformation capability in FDATool to change the magnitude response of your FIR or IIR filters in the tool.
Realizing Filters as Simulink Subsystem Blocks	Using the Realize Model feature to create a Simulink model of your quantized filter as a subsystem block.
Getting Help for FDATool	Shows you how to get help about the features in FDATool, such as using Help or using the What's This option.

The Filter Design Toolbox adds a new dialog and operating mode, and a new menu selection, to the Filter Design and Analysis Tool (FDATool) provided by the Signal Processing Toolbox. From the new dialog, titled Set Quantization Parameters, you can:

View Simulink models of the filter structures available in the toolbox.
Quantize double-precision filters you design in this GUI using the design mode.
Quantize double-precision filters you import into this GUI using the import mode.
Perform analysis of quantized filters.
Scale the transfer function coefficients for a filter to be less than or equal to 1.
Select the quantization settings for the properties of the quantized filter displayed by the tool:

Coefficient
Input
Output
Multiplicand
Product
Sum

Change the input and output scale values for a filter.

After you import a filter in to FDATool, the options on the quantization dialog let you quantize the filter and investigate the effects of various quantization settings.

From the new selection on the FDATool menu bar -- Transformations -- you can transform lowpass FIR and IIR filters to a variety of passband shapes.

You can convert your FIR filters from:

Lowpass to lowpass.
Lowpass to highpass.

For IIR filters, you can convert from:

Lowpass to lowpass.
Lowpass to highpass.
Lowpass to bandpass.
Lowpass to bandstop.

This section presents the following information and procedures for using FDATool:

Example -- Effects of Quantized Arithmetic Switching FDATool to Quantization Mode