I was wondering if any of you know about any technique to extract a harmony (e.g. harmony in a shape of a chromagram) independent timbre characteristic of a sound frame.
What I'm after is a version of spectrum that will make all the piano notes look almost the same despite the fact they occupy different parts of the actual frequency spectrum.
Googling that didn't give me much yet.
Thanks a lot in advance!
EDIT: Great folks in comments pointed out some ambiguity in my question. I'm interested in a metric that is independent of the notes themselves, but captures the whole set of timbral characteristics that could help describe the instrument independently of the note content. It could be a psychoacoustical metric. I'm really curious if anyone knows anything that could fit this task. Thanks a lot!