View source: R/pitchTrackers.R
getPitchSpec  R Documentation 
Internal soundgen function.
getPitchSpec( frame, bin, freqs, specMethod = c("commonFactor", "BaNa")[1], specRatios, specSmooth, specThres, specMerge, specPeak, specHNRslope, HNR = NULL, specSinglePeakCert, pitchFloor, pitchCeiling, nCands )
frame 
the abs spectrum of a frame, as returned by

bin 
the width of spectral bin in 
freqs 
frequency per bin of spectrogram 
specMethod 
"commonFactor" = highest common factor of putative harmonics, "BaNa" = ratio of putative harmonics 
specRatios 
for method = "commonFactor", the number of harmonics AND integer fractions to consider 
specSmooth 
the width of window for detecting peaks in the spectrum, Hz 
specThres 
voicing threshold (unitless, ~0 to 1) 
specMerge 
pitch candidates within 
specPeak, specHNRslope 
when looking for putative harmonics in
the spectrum, the threshold for peak detection is calculated as

HNR 
harmonicstonoise ratio returned by 
specSinglePeakCert 
(0 to 1) if f0 is calculated based on a single
harmonic ratio (as opposed to several ratios converging on the same
candidate), its certainty is taken to be 
pitchFloor, pitchCeiling 
absolute bounds for pitch candidates (Hz) 
nCands 
number of pitch candidates pre frame (specMethod = "commonFactor" always returns a single candidate) 
Attempts to find F0 of a frame by detecting several putative harmonics and either finding their highest common factor (specMethod = "commonFactor") or comparing their ratios (specMethod = "BaNa"). For the highest common factor method, see Howard & Angus (2017) "Acoustics and psychoacoustics" (section 3.2.1). For BaNa, see Ba et al. (2012) "BaNa: A hybrid approach for noise resilient pitch detection." Statistical Signal Processing Workshop (SSP), 2012 IEEE.
Returns either NULL or a dataframe of pitch candidates.
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