Cirrus Logic AN348 - Manual (Page 7)

AN348
AN348REV2 7
Our schematic now looks like this:
Now, mark and copy all fly-offs marked in blue and insert them into the Processing page. Refer to Section 5.1 in the DSP
Composer manual for more details on how to use fly-offs and associated wiring techniques.
NOTE:
DSP Composer verifies that fly-offs used in a design are properly connected in the fly-offs-page accessible in the lower
left corner, see the screenshot above.
You will also notice that unused signals in standard elements such as the PPM block will be marked green, whereas
connected channels will appear black during the wiring process.
The next step is to add some audio filters and other audio processing functions for our design example. Double-click on the
Custom PPM Elements menu on the left to expand and browse through the various element categories such as filters, mixers,
and other functions which are referred to as Primitives in the documentation.
Drag-and-drop the following pre-defined blocks onto the workspace:
• A high-shelf filter and a low-pass 18 dB / Octave filter from the Filters section
• A multi-band parametric EQ available in the filters' m-band, n-band PEQ menu. Enter 6 channels and 4 bands per channel
into the pop-up box.
• A Sine Wave Generator from the Generators selection.
• A signal-presence detector taken from the Meters menu
• A 4 x 6 channel mixer from the Mixers' Custom menu. Enter the corresponding number of channels into the pop-up box.
• A 5 inputs, 4 outputs router from the Routers' Custom menu. Enter the number of I/Os into the pop-up box.