cupyx.scipy.signal.gammatone#

cupyx.scipy.signal.gammatone(freq, ftype, order=None, numtaps=None, fs=None)[source]#

Gammatone filter design.

This function computes the coefficients of an FIR or IIR gammatone digital filter [1].

Parameters:

  • freq (float) – Center frequency of the filter (expressed in the same units as fs).

  • ftype ({'fir', 'iir'}) – The type of filter the function generates. If ‘fir’, the function will generate an Nth order FIR gammatone filter. If ‘iir’, the function will generate an 8th order digital IIR filter, modeled as as 4th order gammatone filter.

  • order (int, optional) – The order of the filter. Only used when ftype='fir'. Default is 4 to model the human auditory system. Must be between 0 and 24.

  • numtaps (int, optional) – Length of the filter. Only used when ftype='fir'. Default is fs*0.015 if fs is greater than 1000, 15 if fs is less than or equal to 1000.

  • fs (float, optional) – The sampling frequency of the signal. freq must be between 0 and fs/2. Default is 2.

Returns:

b, a – Numerator (b) and denominator (a) polynomials of the filter.

Return type:

ndarray, ndarray

Raises:

ValueError – If freq is less than or equal to 0 or greater than or equal to fs/2, if ftype is not ‘fir’ or ‘iir’, if order is less than or equal to 0 or greater than 24 when ftype='fir'

See also

firwin, iirfilter

References