pyACA.ToolFreq2Mel Namespace Reference

Functions
	ToolFreq2Mel (fInHz, cModel='Fant')
	helper function: convert Hz to Mel scale

Function Documentation

ToolFreq2Mel()

ToolFreq2Mel	(		fInHz,
			cModel = 'Fant' )

helper function: convert Hz to Mel scale

Parameters

fInHz	frequency to be converted, can be scalar or vector
cModel	name of the model ('Fant' [default], 'Shaughnessy', 'Umesh')

Returns

fMel: Mel values

Definition at line 13 of file ToolFreq2Mel.py.

def ToolFreq2Mel(fInHz, cModel='Fant'):
    # Fant
    def acaFant_scalar(f):
        return 1000 * math.log2(1 + f/1000)
        
    # Shaughnessy
    def acaShaughnessy_scalar(f):
        return 2595 * math.log10(1 + f/700)
        
    # Umesh
    def acaUmesh_scalar(f):
        return f/(2.4e-4*f + 0.741)
 
    f = np.asarray(fInHz)
    if f.ndim == 0:
        if cModel == 'Shaughnessy':
            return acaShaughnessy_scalar(f)
        elif cModel == 'Umesh':
            return acaUmesh_scalar(f)
        else:
            return acaFant_scalar(f)
 
    fMel = np.zeros(f.shape)
    if cModel == 'Shaughnessy':
        for k, fi in enumerate(f):
            fMel[k] = acaShaughnessy_scalar(fi)
    elif cModel == 'Umesh':
        for k, fi in enumerate(f):
            fMel[k] = acaUmesh_scalar(fi)
    else:
        for k, fi in enumerate(f):
            fMel[k] = acaFant_scalar(fi)
            
    return fMel