scipy.signal.dlti.bode¶

dlti.bode(w=None, n=100)[source]¶

Calculate Bode magnitude and phase data of a discrete-time system.

Returns a 3-tuple containing arrays of frequencies [rad/s], magnitude [dB] and phase [deg]. See dbode for details.

Examples

>>> from scipy import signal
>>> import matplotlib.pyplot as plt

Construct the transfer function \(H(z) = \frac{1}{z^2 + 2z + 3}\) with sampling time 0.5s:

>>> sys = signal.TransferFunction([1], [1, 2, 3], dt=0.5)

Equivalent: signal.dbode(sys)

>>> w, mag, phase = sys.bode()

>>> plt.figure()
>>> plt.semilogx(w, mag)    # Bode magnitude plot
>>> plt.figure()
>>> plt.semilogx(w, phase)  # Bode phase plot
>>> plt.show()