SpectrumToCent¶

standard mode | Spectral category

Inputs¶

spectrum (vector_real) - the input spectrum (must be greater than size one)

Outputs¶

bands (vector_real) - the energy in each band

frequencies (vector_real) - the central frequency of each band

Parameters¶

bands (integer ∈ [1, ∞), default = 720) :
number of bins to compute. Default is 720 (6 octaves with the default ‘centBinResolution’)

centBinResolution (real ∈ (0, ∞), default = 10) :
Width of each band in cents. Default is 10 cents

inputSize (integer ∈ (1, ∞), default = 32768) :
the size of the spectrum

log (bool ∈ {true, false}, default = true) :
compute log-energies (log2 (1 + energy))

minimumFrequency (real ∈ (0, ∞), default = 164) :
central frequency of the first band of the bank [Hz]

normalize (string ∈ {unit_sum, unit_max}, default = unit_sum) :
use unit area or vertex equal to 1 triangles.

sampleRate (real ∈ (0, ∞), default = 44100) :
the sampling rate of the audio signal [Hz]

type (string ∈ {magnitude, power}, default = power) :
use magnitude or power spectrum

Description¶

This algorithm computes energy in triangular frequency bands of a spectrum equally spaced on the cent scale. Each band is computed to have a constant wideness in the cent scale. For each band the power-spectrum (mag-squared) is summed.

Parameter “centBinResolution” should be and integer greater than 1, otherwise an exception will be thrown. TriangularBands is only defined for spectrum, which size is greater than 1.

Source code¶

C++ source code

C++ header file