View source: R/pitchTrackers.R
getPitchHps  R Documentation 
Internal soundgen function.
getPitchHps( frame, freqs, bin, hpsThres, hpsNum, hpsNorm, hpsPenalty, pitchFloor, pitchCeiling )
frame 
the abs spectrum of a frame, as returned by

freqs 
frequency per bin of spectrogram 
bin 
spectrogram bin width, Hz 
hpsThres 
voicing threshold (unitless, ~0 to 1) 
hpsNum 
the number of times the spectrum is downsampled 
hpsNorm 
the amount of inflation of hps pitch certainty (0 = none) 
hpsPenalty 
the amount of penalizing hps candidates in low frequencies (0 = none) 
pitchFloor, pitchCeiling 
absolute bounds for pitch candidates (Hz) 
Estimates pitch per frame using the harmonic product spectrum. Algorithm: downsample the spectrum repeatedly padding with 0 to the original length, then multiply the resulting scaled spectra. This has the effect of emphasizing f0, which should hopefully become the highest spectral peak. See https://cnx.org/contents/i5AAkZCP@2/PitchDetectionAlgorithms
Returns either NULL or a dataframe of pitch candidates.
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