C/C++/Obj-C Real-time algorithm to ascertain Note (not Pitch) from Vocal Input

Question

I want to detect not the pitch, but the pitch class of a sung note.

So, whether it is C4 or C5 is not important: they must both be detected as C.<

Answer 1

if you re beginner this may be very helpful. It is available both on Java and IOS.

dywapitchtrack for ios

dywapitchtrack for java