I'm planning to build an automatic switch box for line inputs to my speakers. The switching itself seems fairly straightforward (a pair of de/multiplexers), but I don't know how to detect the audio signal, it should also not interfere with the signal itself.
The switch box will be controlled by an Arduino or something similar, as it needs to have some kind of timer so that it wont switch back and forth randomly if there are multiple inputs active.
So, how do I detect an active audio signal using an Arduino? (or similar) Will it interfere with the signal itself? How? How do I avoid that?
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