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Smoothing (included in An_aadf_pitch_estimator)
Smoothing pitch values is an orthodox technique, not only to have beautiful curves of intonation, but also to simulate the auditory behaviour, which establish gradually its estimation of pitch. Only stable pitches, however variables can be perceived, sudden glissando have not a definite pitch. The amount of variability of (human) pitch must be assessed if the melody representation reflects human tone rather than fundamental frequency measurement. The last is the cause, the former the effect, and this effect, melody is the reason of our search.
Both figures represent two interpolation strategies, the first using only calculated pitch values, the second, using interpolation in a much finer way.
See another example of this technique:
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