pyACA.FeatureSpectralFlux Namespace Reference

Functions
	FeatureSpectralFlux (X, f_s)
	computes the spectral flux from the magnitude spectrum

Function Documentation

FeatureSpectralFlux()

FeatureSpectralFlux	(		X,
			f_s )

computes the spectral flux from the magnitude spectrum

Parameters

X	spectrogram (dimension FFTLength X Observations)
f_s	sample rate of audio data

Returns

vsf: spectral flux

Definition at line 12 of file FeatureSpectralFlux.py.

def FeatureSpectralFlux(X, f_s):
 
    isSpectrum = X.ndim == 1
    if isSpectrum:
        X = np.expand_dims(X, axis=1)
 
    # difference spectrum (set first diff to zero)
    X = np.c_[X[:, 0], X]
 
    afDeltaX = np.diff(X, 1, axis=1)
 
    # flux
    vsf = np.sqrt((afDeltaX**2).sum(axis=0)) / X.shape[0]
 
    return np.squeeze(vsf) if isSpectrum else vsf