pyACA.ToolInstFreq Namespace Reference

Functions
	ToolInstFreq (X_complex, iHopLength, f_s)
	computes instantaneous frequency utilizing phase of neighboring blocks of complex spectra
	princarg_I (phi)

Function Documentation

princarg_I()

princarg_I

(

phi

)

Definition at line 30 of file ToolInstFreq.py.

def princarg_I(phi):
 
    phase = np.mod(phi + np.pi, -2*np.pi) + np.pi
    return phase

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ToolInstFreq()

ToolInstFreq	(		X_complex,
			iHopLength,
			f_s )

computes instantaneous frequency utilizing phase of neighboring blocks of complex spectra

Parameters

X_complex	complex spectrogram (dimension FFTLength X Observations)
iHopLength	hop length of spectrogram computation
f_s	sample rate of audio data

Returns

f_I: instantaneous frequency (in Hz)

Definition at line 13 of file ToolInstFreq.py.

def ToolInstFreq(X_complex, iHopLength, f_s):
 
    # get phase
    phi = np.angle(X_complex)
    
    # phase offset
    omega = np.pi * iHopLength / X_complex.shape[1] * np.arange(0, X_complex.shape[1])
 
    # unwrapped difference
    delta_phi = omega + princarg_I(phi[1, :] - phi[0, :] - omega)
 
    # instantaneous frequency
    f_I = delta_phi / iHopLength / (2*np.pi) * f_s
    
    return f_I
 
 

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