there are many applications which analyses sound files or microphone inputs. For example a tuner-app for android. Now I am asking myself how they achieve it? I don't know how I should start. Maybe someone of you could give me input or a link to a tutorial. I already googled, but I am overwhelmed with flood of information. I'm only doing this as my hobby, and in the first step I would like to develop a small tuner-app. I hope someone of you can help me.
PS: I already developed several android-apps but most of my time I develop ASP .Net Web Applications. So I am not a newbie in software engineering, but I never analyzed microphone inputs or the like.