- audio
input sound as returned by readAudio
- windowLength
length of FFT window, ms (multiple values in a vector
produce a multi-resolution spectrogram)
- step
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)
- wn
window type accepted by ftwindow
, currently
gaussian, hanning, hamming, bartlett, blackman, flattop, rectangle
- zp
window length after zero padding, points
- dynamicRange
dynamic range, dB. All values more than one dynamicRange
under maximum are treated as zero
- silence
(0 to 1 as proportion of max amplitude) frames with RMS
amplitude below silence * max_ampl adjusted by scale
are not
analyzed at all.
- formants
a list of arguments passed to
findformants
- an external function called to
perform LPC analysis
- nFormants
the number of formants to extract per STFT frame (0 = no
formant analysis, NULL = as many as possible)