From WAV to Graphics to MIDI

From Wave to MIDI: In two easy steps and one hard step. A high-resolution spectrogram is made from a wave audio file. The constant-Q transform and the frequency reassignment algorithm are used for consistent high resolution. The user edits the image to erase overtones and echos. The edited image is then converted to MIDI. Dynamic programming and a nonlinear smoother remove noise and flutter. Greedy agglomeration merges frames into notes.