Chord detection algorithms?

Question

I am developing software that depends on musical chords detection. I know some algorithms for pitch detection, with techniques based on cepstral analysis or autocorrelation

Answer 1

This is quite a good Open Source Project: https://patterns.enm.bris.ac.uk/hpa-software-package

It detects chords based on a chromagram - a good solution, breaks down a window of the whole spectrum onto an array of pitch classes (size: 12) with float values. Then, chords can be detected by a Hidden Markov Model.

.. should provide you with everything you need. :)