Internal soundgen function
getMelSpec(
s,
samplingRate = NULL,
windowLength = 40,
overlap = 50,
step = NULL,
dynamicRange = 80,
maxFreq = NULL,
specPars = list(),
plot = FALSE
)input sound (path to a .wav file or numeric vector)
if one or both inputs are numeric vectors, specify sampling rate, Hz. A vector of length 2 means the two inputs have different sampling rates, in which case spectrograms are compared only up to the lower Nyquist frequency
length of FFT window, ms (multiple values in a vector produce a multi-resolution spectrogram)
overlap between successive FFT frames, %
you can override overlap by specifying FFT step, ms - a
vector of the same length as windowLength (NB: because digital audio is
sampled at discrete time intervals of 1/samplingRate, the actual step and
thus the time stamps of STFT frames may be slightly different, eg 24.98866
instead of 25.0 ms)
parts of the spectra quieter than -dynamicRange dB
are not compared
parts of the spectra above maxFreq Hz are not compared
a list of parameters passed to melfcc
if TRUE, plots the spectrum
Takes a .wav file or a waveform as numeric vector + samplingRate and returns
mel-transformed spectrum (auditory spectrum). Calls
melfcc. See compareSounds.