A couple of posts back, I wrote about Bitstream Autocorrelation (Here and Here). It was an evolutionary path from even older posts on the subject (Here and Here). Now it has matured quite a bit from its inception a few months back.
I’ll discuss what’s new later in another post, but before that, to give you an idea how well this continuous pitch detector tracks, I’ll present some demo sound clips. The left channel contains the original raw guitar signal (normalized), while the right channel contains a simple synthesized pulse wave, modulated by its own envelope, tracking the source. We’ll start with single notes and proceed later with a few single-string phrases demonstrating various guitar playing techniques such as legato, hammer-on, pull-off, etc.