🚀 go-pugleaf

Does anyone have Motorola 56000 code for real-time pitch-tracking?
Specifically, I'm hoping to determine the pitch of the acoustic signal
from a cello in real-time--as part of a live performance.

Originally, we weren't planning to dedicate too many person-hours into
this project--hoping instead to just purchase a pitch-tracking system.
We tested a number of off-the-shelf pitch trackers, including Zeta's
Cello Retropak, various ivl pitch-to-midi converters, and the Roland
CP-40.  None of them was acceptable.

For the moment, we've implemented an algorithm to look for max peaks and
to measure the distance between these peaks.  (A bowed instrument has a
characteristic waveform with a big peak that corresponds to the bow
"grabbing" the string and many little peaks resulting from the bow
"slipping/dragging" the string.)  This works great for *clean* signals,
but it isn't too reliable when the signal has many harmonics or changes
amplitude quickly (when the "slip/drag" peaks are close to the size of
the main "grab" peak).

Any suggestions?  Thanks in advance.  I will post a summary of all the
responses I get.

--Andy Hong, MIT Media Lab's Music & Cognition Group

-- 
skate safe.  andy.