how to calculate a MIDI files's chords?
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Posted By:   Lauren_Gui
Posted On:   Wednesday, January 31, 2007 04:04 AM

some sound files have chords,such as 4,20,32,64.
how to calculate a MIDI files's chords?

Re: how to calculate a MIDI files's chords?

Posted By:   Christopher_Koenigsberg  
Posted On:   Friday, February 2, 2007 11:44 PM

What exactly are you asking? Are you trying to determine whether successive note values are close enough in time, to be considered as a single "chord"?

If it's from a real human's performance on a real keyboard, there will always be some random delay involved, between the individual notes of a "chord".

That's one reason why MIDI sucks, because it can't easily represent even musical abstractions as simple as a "chord".

Maybe you'll have to decide on a quantization threshold, where if two successive notes are separated by less than that amount of time, you consider them to be "simultaneous" and thus part of a "chord"? and of course you'll have to experiment with your real data and decide where to set this threshold, depending on the skill of the performer, the expressiveness/rubato nature of the performance, etc.
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