ERBBands
standard mode | Spectral category
Inputs
- spectrum (vector_real) - the audio spectrum
Outputs
- bands (vector_real) - the energies/magnitudes of each band
Parameters
- highFrequencyBound (real ∈ [0, ∞), default = 22050) :
- an upper-bound limit for the frequencies to be included in the bands
- inputSize (integer ∈ (1, ∞), default = 1025) :
- the size of the spectrum
- lowFrequencyBound (real ∈ [0, ∞), default = 50) :
- a lower-bound limit for the frequencies to be included in the bands
- numberBands (integer ∈ (1, ∞), default = 40) :
- the number of output bands
- sampleRate (real ∈ (0, ∞), default = 44100) :
- the sampling rate of the audio signal [Hz]
- type (string ∈ {magnitude, power}, default = power) :
- use magnitude or power spectrum
- width (real ∈ (0, ∞), default = 1) :
- filter width with respect to ERB
Description
This algorithm computes energies/magnitudes in ERB bands of a spectrum. The Equivalent Rectangular Bandwidth (ERB) scale is used. The algorithm applies a frequency domain filterbank using gammatone filters. Adapted from matlab code in: D. P. W. Ellis (2009). 'Gammatone-like spectrograms', web resource [1].
- References:
[1] http://www.ee.columbia.edu/~dpwe/resources/matlab/gammatonegram/
[2] B. C. Moore and B. R. Glasberg, "Suggested formulae for calculating auditory-filter bandwidths and excitation patterns," Journal of the Acoustical Society of America, vol. 74, no. 3, pp. 750–753, 1983.
See also
ERBBands (streaming)