modulationSpectrumFragment: Modulation spectrum per fragment

In soundgen: Sound Synthesis and Acoustic Analysis

Modulation spectrum per fragment

Description

Internal soundgen function.

Usage

modulationSpectrumFragment(
  sound,
  samplingRate,
  windowLength,
  windowLength_points,
  step,
  step_points,
  wn = "hanning",
  zp = 0,
  logSpec = FALSE,
  power = 1,
  normalize = TRUE
)

Arguments

sound	numeric vector
samplingRate	sampling rate of x (only needed if x is a numeric vector)
windowLength	length of FFT window, ms
step	you can override overlap by specifying FFT step, ms (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, rectangular, blackman, flattop
zp	window length after zero padding, points
logSpec	if TRUE, the spectrogram is log-transformed prior to taking 2D FFT
power	raise modulation spectrum to this power (eg power = 2 for ^2, or "power spectrum")
normalize	if TRUE, the modulation spectrum of each analyzed fragment maxDur in duration is separately normalized to have max = 1

Examples

s = soundgen(amFreq = 25, amDep = 100)
ms = soundgen:::modulationSpectrumFragment(s, 16000,
  windowLength = 50, windowLength_points = .05 * 16000,
  step = 5, step_points = .005 * 16000)
image(as.numeric(colnames(ms$ms_half)), as.numeric(rownames(ms$ms_half)),
      t(log(ms$ms_half)))

soundgen documentation built on Sept. 29, 2023, 5:09 p.m.