pyACA.NoveltyLaroche Namespace Reference

Functions
	NoveltyLaroche (X, f_s)
	computes the novelty measure intnroduced by Laroche

Function Documentation

NoveltyLaroche()

NoveltyLaroche	(		X,
			f_s )

computes the novelty measure intnroduced by Laroche

Parameters

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

Returns

d_lar: novelty measure

Definition at line 12 of file NoveltyLaroche.py.

def NoveltyLaroche(X, f_s):
 
    # difference spectrum (set first diff to zero)
    X = np.c_[np.sqrt(X[:, 0]), np.sqrt(X)]
 
    afDeltaX = np.diff(X, 1, axis=1)
 
    # half-wave rectification
    afDeltaX[afDeltaX < 0] = 0
 
    # flux
    d_lar = np.sum(afDeltaX, axis=0) / X.shape[0]
 
    return d_lar