UM1545 datasheet(29/64 Pages) STMICROELECTRONICS

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UM1545

APW walkthrough

Doc ID 023225 Rev 1

29/64

might be the sum of the contribution of two or more filters, this option forces the

APW to plot also the graph of each single filter (Figure 26).

–

Zoom Out: resets the zoom setup to the default.

–

Copy To Clipboard: copies the graph to the clipboard.

–

Show Usage: displays a short explanation about the usage of the Equalizer Editor.

●

Moving the mouse wheel on a filter handler will increase or decrease its Q.

●

Moving the wheel on any other point of the graph will vary the zoom.

Please note that the Sound Terminal® products support different processing sampling

frequencies and obviously this frequency is a key factor when plotting the filter graphs or

computing the coefficients. The APW is able to take into account this parameter, thus

plotting the correct frequency response. Depending on the selected device, this is

performed either automatically or by setting manually the sampling frequency. In any case,

the frequency in use is shown in the APW status bar.

2.6

Scripts

Another powerful tool offered by the APW is the capability of writing and running a script.

To run a script select from the APW File menu and left click on Run Script as shown in

Figure 27.

Running a script

The Run again last script option allows using the last selected script, thus avoiding having to

specify its location every time. For an example of a script, please refer to the file

SampleScript.aps delivered together with the APWorkbench installation package or go to

Appendix C: Script file. Hereafter is a brief description of the syntax and of the functionalities

for each token available:

RESET

Resets the device reset pulse to last 50 msec. It also sets the I2C registers and the

coefficients to their default values (in the local banks).

SET_RST <l_state>

Sets the physical reset line to the logic state l_state. This command together with the P

command allows having reset pulses longer than the default value applied with the RESET

command.

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