MFCCs: S3 Generic to calculate MFCCs (Mel Frequency Cepstral...

In LiKao/VoiceExperiment: Analysis of Vocal Responses to Psychological Experiments

Description

S3 Generic to calculate MFCCs (Mel Frequency Cepstral Coefficients) for a given time series

Usage

MFCCs(ts, window.width = 25, stepsize = 10,
  window.function = signal::hanning, lower = 300, upper = 8000,
  filterbanks = 26, preemph = 0.97, retain.coeffs = 1:13, delta = 2,
  ...)

Arguments

ts	The time series object
window.width	Window width for each MFCC vector (in ms)
stepsize	Stepsize ms samples by which each window is advanced
window.function	Windowing function for window extraction.
lower	Lowest frequency to be used for MFCC calculation (default 300Hz)
upper	Highest frequency to be used for MFCC calculation (default 8kHz)
filterbanks	Number of MFCC filterbanks to produce (default 26)
preemph	Strength of pre-emphasis filter applied to original signal (defaul 0.97).
retain.coeffs	A vector of the coefficients to retain (starting a 0; default 1:13). Set to NULL to keep all coefficients.
delta	Number of deltas (differences between subsequent vectors) to be computed
...	Additional parameters for future methods

Details

The signal is sliced into windows each of the size determined by window.width. For each window a MFCC vector is calculated. For each

LiKao/VoiceExperiment documentation built on May 7, 2019, 1:19 p.m.