Alter firmware to accept digital I2S audio signal
Would it be possible to modify the Audiomoth firmware to accept a digital I2S audio signal instead of the analog signal from the onboard microphone handled by the internal ADC in the EFM32 chip.
It seems that the limitation in the audio quality of the Audiomoth device is related to either the signal path or the internal analog to digital converter wich is supposed to have 12-bit resolution but has a real resolution of roughly 8-9 bits and quite a bit of noise.
Maybe it would require a whole new firmware? Even if most of the audio settings in the firmware wouldn't work, it would be useful if the scheduling, highpass and lowpass filter, amplitude threshold and such worked.
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Q1
Is the Audiomoth firmware open source? Or how can we achieve a modified version supporting I2S digital audio signal input on the EFM32?
Q2
Is it correct that the Audiomoth 1.2 is running one or more low quality capacitors in the analog signal path? It seems so when studying the PCB.
Q3
Is the hardware layout available open source if I want to modify it to increase the audio quality of the device in the current layout.
Thank you!