Learn more about Filter Design Toolbox

Switching FDATool to Quantization Mode

You use the quantization mode in FDATool to quantize filters. Quantization represents the fourth operating mode for FDATool, along with the filter design, filter transformation, and import modes. To switch to quantization mode, open FDATool from the MATLAB command prompt by entering

fdatool

You see FDATool in this configuration.

When FDATool opens, click the Set Quantization Parameters button on the side bar. FDATool switches to quantization mode and you see the following panel at the bottom of FDATool, with the default double-precision option shown for Filter Arithmetic.

The Filter Arithmetic option lets you quantize filters and investigate the effects of changing quantization settings. To enable the quantization settings in FDATool, select Fixed-point from the Filter Arithmetic.

The quantization options appear in the lower panel of FDATool. You see tabs that access various sets of options for quantizing your filter.

You use the following tabs in the dialog box to perform tasks related to quantizing filters in FDATool:

• Coefficients provides access the settings for defining the coefficient quantization. This is the default active panel when you switch FDATool to quantization mode without a quantized filter in the tool. When you import a fixed-point filter into FDATool, this is the active pane when you switch to quantization mode.

• Input/Output switches FDATool to the options for quantizing the inputs and outputs for your filter.

• Filter Internals lets you set a variety of options for the arithmetic your filter performs, such as how the filter handles the results of multiplication operations or how the filter uses the accumulator.

• Apply — applies changes you make to the quantization parameters for your filter.

Designing Advanced Filters in FDATool

Quantizing Filters in the Filter Design and Analysis Tool

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