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Interpretation of AC1

Can someone tell me what the AC1 of yin means (papers?) and how to interpret the values of AC1 that comes out of something like mubu.process slice:yin ?

ac1 is the first order autocorrelation, and corresponds to spectral tilt, related to vocal or instrumental effort. Very effective e.g. for trumpet “brassyness”.
See Cheveigné and Kawahara, YIN: a fundamental frequency estimator for speech and music, JASA 2002.

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