I am new to signal processing and I have likely a very easy question but I have found inconsistent answers everywhere.
When performing an FFT, does it matter what units the amplitude is in? Currently my input is in mV.
If I use mV for an FFT, then use it to get a spectrogram, what are the visual units (strength of signal) of the spectrogram? Is it dB?
matplotlib.specgram to perform this.