[PD] [Bulk] Re: automatically get chord from sequence of notes?

[Alessio Degani]

On 20/02/2015 15:28, Rivoire David wrote:
> Yeah, but there is a link between this two topics, after having 
> analysed the harmonics I would like to create a sequence of notes 
> about it and automatically get chords that fit into it...
In general, this is not an "easy" task.
I'm currently working (research) on the audio chord estimation (ACE) topic.
For a "standard" song (polyphonic, poly-intrument) the accuracy is still 
far from perfect (~75% of accuracy on a given, limited, test-set).

However, for a single instrument, you can achieve good results with a 
simple template matching.
You can't work directly on the FFT, but from the FFT you have to 
calculate a 12-dimensional mid-level descriptor (called Pitch Class 
Profile).
Then you can train your chord templates using a specified instrument 
(i.e. if you want to estimate piano chords, you have to train your 
templates with your piano).

Cheers

-- 
a.

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