Chromagram¶

Inputs¶

• frame (vector_real) - the input audio frame

Outputs¶

• chromagram (vector_real) - the magnitude constant-Q chromagram

Parameters¶

• binsPerOctave (integer ∈ [1, ∞), default = 12) :

  number of bins per octave

• minFrequency (real ∈ [1, ∞), default = 32.7) :

  minimum frequency [Hz]

• minimumKernelSize (integer ∈ [2, ∞), default = 4) :

  minimum size allowed for frequency kernels

• normalizeType (string ∈ {none, unit_sum, unit_max}, default = unit_max) :

  normalize type

• numberBins (integer ∈ [1, ∞), default = 84) :

  number of frequency bins, starting at minFrequency

• sampleRate (real ∈ [0, ∞), default = 44100) :

  FFT sampling rate [Hz]

• scale (real ∈ [0, ∞), default = 1) :

  filters scale. Larger values use longer windows

• threshold (real ∈ [0, 1), default = 0.01) :

  bins whose magnitude is below this quantile are discarded

• windowType (string ∈ {hamming, hann, hannnsgcq, triangular, square, blackmanharris62, blackmanharris70, blackmanharris74, blackmanharris92}, default = hann) :

  the window type

• zeroPhase (bool ∈ {true, false}, default = true) :

  a boolean value that enables zero-phase windowing. Input audio frames should be windowed with the same phase mode

Description¶

This algorithm computes the Constant-Q chromagram using FFT. See ConstantQ algorithm for more details.

Source code¶

• C++ source code

• C++ header file

See also¶

Chromagram (standard) ConstantQ (standard) ConstantQ (streaming) FFT (standard) FFT (streaming)