The ADAU1781 supports two audio inputs and has two audio outputs, with an equalizer in the middle. Can the equalizer be different for the two channels?
Yes. It's important to note that the ADAU1781 doesn't just do equalization. It is fully programmable in our SigmaStudio drag-and-drop graphical programming software. It supports about 400 audio processing algorithms (including various varieties of EQ) that can be placed anywhere in the signal processing chain, independently for each audio channel.
You can find a list of algorithms supported on the ADAU1781 on each of these sub-pages:
Advanced DSP Resource Table
Basic DSP Resource Table
Counters Resource Table
Dynamics Processors Resource Table
Filters Resource Table
GPIO Conditioning Resource Table
IO Resource Table
Level Detectors/Lookup Tables Resource Table
Mixers/Splitters Resource Table
Muxes/Demuxes Resource Table
Non-Linear Processors Resource Table
Sources Resource Table
Volume Controls Resource Table
There is documentation for these algorithms available on these pages (currently under construction):
Input / Output
Level Detectors / Lookup Tables
Mixers / Splitters
Multiplexers / Demultiplexers
SigmaStudio lets you use these blocks to build up a signal processing flow to fit your needs. Here's an example of using level controls to create a broadcast ducking appliction:
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