UM1545 datasheet(23/64 Pages) STMICROELECTRONICS

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UM1545

APW walkthrough

Doc ID 023225 Rev 1

23/64

2.5

Equalizer Editor

Figure 20.

Equalizer Editor tab

The Equalizer Editor tab offers the possibility to design different types of filters and to

compute and download into the device the relevant coefficients either by defining their

graphs or their qualitative parameters. The supported filters are (see Appendix A: Types of

filters supported):

●

Peak

●

High-pass

●

Low-pass

●

High-shelf

●

Low-shelf

The upper part of the tab is occupied by the graphical editor and by the design tools

(Figure 21). To design a filter by defining its graph, follow the steps described below:

Select the kind of filter to be designed by pressing the button on the right side of the

graph. It is also possible to select which biquadratic filter of the DUT to write in

(Figure 21, highlighted in red).

After selecting the filter type, a default graph will be plotted. A red dot indicates the filter

handler (Figure 21). Move the mouse over this point, left click with the mouse and keep

pressed. While doing so, move the mouse pointer around the graph to modify the filter

drawing as needed. Release the left button of the mouse when the filter fits the

requirements. The filter handler may vary according to the filter type. In Figure 21 a

low-pass filter has been selected. For this kind of filter a red vertical line is used to

clearly identify the frequency whose gain is -3 dB (i.e. the cutoff frequency).

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