analyzeFrame: Analyze fft frame

In soundgen: Sound Synthesis and Acoustic Analysis

Analyze fft frame

Description

Internal soundgen function.

Usage

analyzeFrame(
  frame,
  bin,
  freqs,
  autoCorrelation = NULL,
  samplingRate,
  scaleCorrection,
  loudness,
  cutFreq,
  trackPitch = TRUE,
  pitchMethods = c("dom", "autocor"),
  nCands,
  pitchDom = list(),
  pitchAutocor = list(),
  pitchCep = list(),
  pitchSpec = list(),
  pitchHps = list(),
  pitchFloor,
  pitchCeiling
)

Arguments

frame	the abs spectrum of a frame, as returned by fft
bin	spectrogram bin width, Hz
freqs	frequency per bin of spectrogram
autoCorrelation	pre-calculated autocorrelation of the input frame (computationally more efficient than to do it here)
samplingRate	sampling rate (Hz)
loudness	a list of parameters passed to getLoudness for measuring subjective loudness, namely SPL_measured, Pref, spreadSpectrum. NULL = skip loudness analysis
cutFreq	if specified, spectral descriptives (peakFreq, specCentroid, specSlope, and quartiles) are calculated only between cutFreq[1] and cutFreq[2], Hz. If a single number is given, analyzes frequencies from 0 to cutFreq. For ex., when analyzing recordings with varying sampling rates, set to half the lowest sampling rate to make the spectra more comparable. Note that "entropyThres" applies only to this frequency range, which also affects which frames will not be analyzed with pitchAutocor.
trackPitch	if TRUE, attempt to find F0 in this frame (FALSE if entropy is above some threshold - specified in analyze)
pitchMethods	methods of pitch estimation to consider for determining pitch contour: 'autocor' = autocorrelation (~PRAAT), 'cep' = cepstral, 'spec' = spectral (~BaNa), 'dom' = lowest dominant frequency band, 'hps' = harmonic product spectrum, NULL = no pitch analysis
nCands	maximum number of pitch candidates per method, normally 1...4 (except for dom, which returns at most one candidate per frame)
pitchDom	a list of control parameters for pitch tracking using the lowest dominant frequency band or "dom" method; see details and ?soundgen:::getDom
pitchAutocor	a list of control parameters for pitch tracking using the autocorrelation or "autocor" method; see details and ?soundgen:::getPitchAutocor
pitchCep	a list of control parameters for pitch tracking using the cepstrum or "cep" method; see details and ?soundgen:::getPitchCep
pitchSpec	a list of control parameters for pitch tracking using the BaNa or "spec" method; see details and ?soundgen:::getPitchSpec
pitchHps	a list of control parameters for pitch tracking using the harmonic product spectrum or "hps" method; see details and ?soundgen:::getPitchHps
pitchFloor, pitchCeiling	absolute bounds for pitch candidates (Hz)

Details

This function performs the heavy lifting of pitch tracking and acoustic analysis in general: it takes the spectrum of a single fft frame as input and analyzes it.

Value

Returns a list with two components: $pitchCands_frame contains pitch candidates for the frame, and $summaries contains other acoustic predictors like HNR, specSlope, etc.

soundgen documentation built on Sept. 12, 2024, 6:29 a.m.