A UGen that maps short-time Fourier transformed spectra to the mel scale. To obtain
the MFCC, one has to take the log of the output of this UGen and decimate it with a DCT.
Example:
def mfcc(in: GE) = {
val fsz = 1024
val lap = Sliding(in, fsz, fsz/2) * GenWindow(fsz, GenWindow.Hann)
val fft = Real1FFT(lap, fsz, mode = 1)
val mag = fft.complex.mag.max(-80)
val mel = MelFilter(mag, fsz/2, bands = 42)
DCT_II(mel.log, 42, 13, zero = 0)
}
- Value parameters:
- bands
number of filter bands output
- in
magnitudes of spectra, as output by
Real1FFT(..., mode = 1).complex.abs- maxFreq
upper frequency to sample. Will be clipped between
minFreq(inclusive) and Nyquist (exclusive).- minFreq
lower frequency to sample. Will be clipped between zero (inclusive) and Nyquist (exclusive).
- size
bands in input spectrum (assumed to be
fft-size / 2). lowest band corresponds to DC and highest to(size - 1)/size * sampleRate/2.
- Companion:
- object