View source: R/modulationSpectrum_utilities.R
msToSpec | R Documentation |
Takes a complex MS and transforms it to a complex spectrogram with proper row (frequency) and column (time) labels.
msToSpec(ms, windowLength = NULL, step = NULL)
ms |
target modulation spectrum (matrix of complex numbers) |
windowLength |
length of FFT window, ms |
step |
you can override |
Returns a spectrogram - a numeric matrix of complex numbers of the same dimensions as ms.
s = soundgen(sylLen = 250, amFreq = 25, amDep = 50,
pitch = 250, samplingRate = 16000)
spec = spectrogram(s, samplingRate = 16000, windowLength = 25, step = 5)
ms = specToMS(spec)
image(x = as.numeric(colnames(ms)), y = as.numeric(rownames(ms)),
z = t(log(abs(ms))), xlab = 'Amplitude modulation, Hz',
ylab = 'Frequency modulation, cycles/kHz')
spec_new = msToSpec(ms)
image(x = as.numeric(colnames(spec_new)), y = as.numeric(rownames(spec_new)),
z = t(log(abs(spec_new))), xlab = 'Time, ms',
ylab = 'Frequency, kHz')
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