JJA | Praat's Pitch Algorithm: "The autocorrelation is highest at a time lag of 0, so we need to look for peaks that are greater than 0 for significant periodicity. However, in this case, since we are working with a complex sound wave with a loud harmonic, the autocorrelation curve shows a false peak (red line) before the time lag that we know is the sound's actual fundamental frequency (green line), which is alligned with a lower peak."
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