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Module « scipy.signal »

Fonction findfreqs - module scipy.signal

Signature de la fonction findfreqs

def findfreqs(num, den, N, kind='ba') 

Description

help(scipy.signal.findfreqs)

Find array of frequencies for computing the response of an analog filter.

Parameters
----------
num, den : array_like, 1-D
    The polynomial coefficients of the numerator and denominator of the
    transfer function of the filter or LTI system, where the coefficients
    are ordered from highest to lowest degree. Or, the roots  of the
    transfer function numerator and denominator (i.e., zeroes and poles).
N : int
    The length of the array to be computed.
kind : str {'ba', 'zp'}, optional
    Specifies whether the numerator and denominator are specified by their
    polynomial coefficients ('ba'), or their roots ('zp').

Returns
-------
w : (N,) ndarray
    A 1-D array of frequencies, logarithmically spaced.

Examples
--------
Find a set of nine frequencies that span the "interesting part" of the
frequency response for the filter with the transfer function

    H(s) = s / (s^2 + 8s + 25)

>>> from scipy import signal
>>> signal.findfreqs([1, 0], [1, 8, 25], N=9)
array([  1.00000000e-02,   3.16227766e-02,   1.00000000e-01,
         3.16227766e-01,   1.00000000e+00,   3.16227766e+00,
         1.00000000e+01,   3.16227766e+01,   1.00000000e+02])

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