SpectralWhitening

streaming mode | Spectral category

Inputs

  • spectrum (vector_real) - the audio linear spectrum
  • frequencies (vector_real) - the spectral peaks' linear frequencies
  • magnitudes (vector_real) - the spectral peaks' linear magnitudes

Outputs

  • magnitudes (vector_real) - the whitened spectral peaks' linear magnitudes

Parameters

  • maxFrequency (real ∈ (0, ∞), default = 5000) :
    max frequency to apply whitening to [Hz]
  • sampleRate (real ∈ (0, ∞), default = 44100) :
    the sampling rate of the audio signal [Hz]

Description

Performs spectral whitening of spectral peaks of a spectrum. The algorithm works in dB scale, but the conversion is done by the algorithm so input should be in linear scale. The concept of 'whitening' refers to 'white noise' or a non-zero flat spectrum. It first computes a spectral envelope similar to the 'true envelope' in [1], and then modifies the amplitude of each peak relative to the envelope. For example, the predominant peaks will have a value close to 0dB because they are very close to the envelope. On the other hand, minor peaks between significant peaks will have lower amplitudes such as -30dB.

The input "frequencies" and "magnitudes" can be computed using the SpectralPeaks algorithm.

An exception is thrown if the input frequency and magnitude input vectors are of different size.

References:
[1] A. Röbel and X. Rodet, "Efficient spectral envelope estimation and its application to pitch shifting and envelope preservation," in International Conference on Digital Audio Effects (DAFx’05), 2005.

See also

SpectralPeaks (standard) SpectralPeaks (streaming) SpectralWhitening (standard)

Streaming algorithms

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