Automatic conversion of sound to the MIDI- format *
Johan Forsberg · 1998
An experimental system for converting an audio signal into MIDI representation is presented. The system works in the frequency domain. A constant Q transform is used to compute spectrograms from which the partials are tracked. The partial trajectories are then parameterized in time and frequency resulting in a "pianola roll" representation, suitable for conversion to MIDI-code. The system performance is acceptable for music with reasonably well defined boundaries between notes. Typical errors which occur in the present state of development are placement of notes in the wrong octave, and generation of "ghost notes" which not belong to the score.