I had installed edge impulse Arduino nano 33 ble sense firmware in January and then I downloaded the updated version in July.
In both the versions installed, there is a difference in the quality of the signal collected by the microphone.
For the January version, the signal quality is good and the gain is less.
In the July version of the firmware, the gain is very high and the signal is also very noisy.
I tried lowering the gain in the July version of the firmware but still, the signal remains noisy. I could not find what changes in code correspond to such a result.
Can I know what kind of processing is applied on the signal in the January version of the firmware or what exactly changed in the code in the last few months that might have led to such results?