Multi usage of a microphone
Hello, I'm working on a small project and I'm very short on time and money limited. The idea is to try to use an adaptive electronic filter to reduce the feedback loop in a microphone - amplifier system.
I want to use a microphone linked to an Arduino board to get the sound and process it through FFT to determine the high frequency, and if it is too high, to cut it.
On the other hand, I already did a working feedback loop setup but with a guitar amplifier and an old microphone that was not very reliable. So I wanted to use the Arduino microphone to send back the sound through the filter to the amplifier.
But sound signals are centered on 0V, with negative values as Arduino mic and analog inputs are between 0V and 5V. And so I don't really know how to do so. Can I use the same microphone for both ? Or do I absolutely need 2 separate microphones ?
Also, more about the challenge in general, do you have any advice that could help me, or warning, for example about the use of a guitar amplifier ?