UM1545 datasheet(28/64 Pages) STMICROELECTRONICS

28 / 64 page

APW walkthrough

UM1545

28/64

Doc ID 023225 Rev 1

At the end the left lower side of the Equalizer Editor tab groups the filter apply option. The

user, through the Enable Auto-Apply option, can choose whether to automatically apply a

filter or not. In this latter case to transfer the filter (or filters) set up for the device, the Apply

button has to be used. Please be aware that this button bypasses the Auto Apply option.

The figure below shows the global frequency response of the selected channel (yellow line)

overlapped by the graphs of the two filters (green lines) contributing to it.

Figure 26.

Equalizer Editor tab, miscellaneous options

The last options available in this tab can be selected using the mouse controls on the graph

area:

●

By right clicking with the mouse on the graph area, a menu will pop-up (Figure 26):

–

Add/Delete PEQ Point: a shortcut to add/delete a peak filter in the point selected

with the mouse.

–

Set Ranges: allows setting the ranges shown in the graph.

–

Show Coordinates Info: when this option is enabled, the coordinates of the point of

the graph on which the mouse is located, will pop up.

–

Show fixed-point plot: by default (option) the APW plots the filter’s frequency

response using a floating point notation. Use this option to generate the plots

using the 24-bit fixed point notation as used by the Sound Terminal® products.

–

Show PEQ Curves: the Equalizer Editor shows by default the whole frequency

response of the selected processing channel. Since, as stated before, this curve

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