Module « scipy.signal »

Fonction lp2hp_zpk - module scipy.signal

Signature de la fonction lp2hp_zpk

def lp2hp_zpk(z, p, k, wo=1.0) 

Description

lp2hp_zpk.__doc__

    Transform a lowpass filter prototype to a highpass filter.

    Return an analog high-pass filter with cutoff frequency `wo`
    from an analog low-pass filter prototype with unity cutoff frequency,
    using zeros, poles, and gain ('zpk') representation.

    Parameters
    ----------
    z : array_like
        Zeros of the analog filter transfer function.
    p : array_like
        Poles of the analog filter transfer function.
    k : float
        System gain of the analog filter transfer function.
    wo : float
        Desired cutoff, as angular frequency (e.g., rad/s).
        Defaults to no change.

    Returns
    -------
    z : ndarray
        Zeros of the transformed high-pass filter transfer function.
    p : ndarray
        Poles of the transformed high-pass filter transfer function.
    k : float
        System gain of the transformed high-pass filter.

    See Also
    --------
    lp2lp_zpk, lp2bp_zpk, lp2bs_zpk, bilinear
    lp2hp

    Notes
    -----
    This is derived from the s-plane substitution

    .. math:: s \rightarrow \frac{\omega_0}{s}

    This maintains symmetry of the lowpass and highpass responses on a
    logarithmic scale.

    .. versionadded:: 1.1.0