UG-072
Evaluation Board User Guide
Rev. A | Page 4 of 20
YOUR FIRST SIGMASTUDIO PROJECT—EQ AND
VOLUME CONTROL
The following is a procedure for building your first project in
SigmaStudio and running it on the evaluation board. This
procedure creates a simple design that creates a volume control
and five-band EQ on a stereo input signal.
1.
Create a new project. SigmaStudio opens to the
Hardware
Configuration
Tab.
2.
Drag a SigmaDSP IC (
ADAU1401A, ADAU1701,
ADAU1702, or ADAU1401)
,
E2Prom
, and a
USBi
cell
into the blank white space.
Note: If you are using a processor other than the
ADAU1401A, (for example,
ADAU1701 or
ADAU1702
),
drag that processor out instead.
3.
Connect the
USBi
cell to the
ADAU1401A
(or other
SigmaDSP) cell by clicking and dragging from the top blue
output pin to the green input pin.
4.
Connect the second
USBi
blue output pin to the green
input pin on the
E2Prom
cell.
The screen should appear as it does in Figure 3.
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003
Figure 3. Hardware Configuration Tab
5.
Click the
Schematic
tab at the top of the screen.
6.
In the
Tree ToolBox
section, expand the
IO
>
Input
. Click
and drag an
Input
cell to the work area.
7.
Similarly, expand
Filters
>
Second
Order
>
Double
Precision
>
2 Ch
and click and drag
Medium Size Eq
to
the work area.
8.
Right-click the general (second-order) cell labeled
Gen
Filter1
.
9.
Click
Grow Algorithm
>
1
.
2 Channel – Double
Precision
>
4.
This creates a five-band equalizer (EQ).
Each band’s general filter settings can be modified by
clicking the blue boxes on the cell.
10.
Expand
Volume Controls
>
Adjustable Gain
>
Shared
Slider
>
Clickless SW Slew
and
click and drag
Single slew
11.
Expand the
IO
>
Output
. Click and drag two
Output
cells
12.
For each of the outputs, select a DAC output by clicking the
pull-down box.
DAC0
and
DAC1
are left and right
outputs, 0 and 1, from the ADAU1401A (output on J1 as
marked in green in Figure 2), respectively.
DAC2
and
DAC3
are left and right channel, respectively for the
second stereo line output (J3 on the board).
13.
Connect all the cells as depicted in Figure 4.
14.
Make sure the board is powered and connected to the PC.
Click the
Link-Compile-Download
button in the
SigmaStudio toolbar, or select
Link-Compile-Download
from the
Action
menu.
15.
If the project compiled without error, you will be in Ready-
Download mode.
Your screen should now appear as it does in Figure 4.
16.
Play your audio source; audio should now be available.
Move the volume control and filter sliders and hear the
effect on the output audio in real time.
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004
Figure 4. Schematic Tab, Full Design
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