I am using Librosa to detect pitch in a guitar audio signal. I have very little background in signal processing, and I was quite confused with the distinction between analog - digital signals and continuous-time - discrete-time signals.
I am aware that, when I load an audio file in Librosa like this:
y, sr = librosa.load(filename, sr=11025)
I convert the signal to discrete-time. I think that's true as otherwise I wouldn't need to provide an
However, is the signal digital or analog? I see that the analog signal is defined as:
A signal whose amplitude can take on any value in a continuous range
So when does the conversion from analog to digital happen? Or am I working with analog signals?