pyACA.ToolMel2Freq Namespace Reference

Functions
	ToolMel2Freq (fMel, cModel='fant')
	helper function: convert Mel to Hz

Function Documentation

ToolMel2Freq()

ToolMel2Freq	(		fMel,
			cModel = 'fant' )

helper function: convert Mel to Hz

Parameters

fMel	Mel frequency
cModel	name of the model ('Fant' [default], 'Shaughnessy', 'Umesh')

Returns

f: frequency in Hz

Definition at line 10 of file ToolMel2Freq.py.

def ToolMel2Freq(fMel, cModel='fant'):
    def acaFant_I(m):
        # mel = 1000 * log2(1 + f / 1000);
        return 1000 * (2 ** (m / 1000) - 1)
 
    def acaShaughnessy_I(m):
        # mel = 2595 * log10(1 + f / 700);
        return 700 * (10 ** (m / 2595) - 1)
 
    def acaUmesh_I(m):
        # mel = f / (2.4e-4 * f + 0.741);
        return m * 0.741 / (1 - m * 2.4e-4)
 
 
    cModel = cModel.lower()
    if cModel == 'fant':
        return acaFant_I(fMel)
    elif cModel == 'shaughnessy':
        return acaShaughnessy_I(fMel)
    elif cModel == 'umesh':
        return acaUmesh_I(fMel)
    else:
        print('Invalid model type')