Module « scipy.signal »

Fonction symiirorder2 - module scipy.signal

Signature de la fonction symiirorder2

Description

symiirorder2.__doc__

out = symiirorder2(input, r, omega, precision=-1.0)

    Implement a smoothing IIR filter with mirror-symmetric boundary conditions
    using a cascade of second-order sections.  The second section uses a
    reversed sequence.  This implements the following transfer function::

                                  cs^2
         H(z) = ---------------------------------------
                (1 - a2/z - a3/z^2) (1 - a2 z - a3 z^2 )

    where::

          a2 = (2 r cos omega)
          a3 = - r^2
          cs = 1 - 2 r cos omega + r^2

    Parameters
    ----------
    input : ndarray
        The input signal.
    r, omega : float
        Parameters in the transfer function.
    precision : float
        Specifies the precision for calculating initial conditions
        of the recursive filter based on mirror-symmetric input.

    Returns
    -------
    output : ndarray
        The filtered signal.