square(t, duty=0.5)
The square wave has a period 2*pi
, has value +1 from 0 to 2*pi*duty
and -1 from 2*pi*duty
to 2*pi
. :None:None:`duty` must be in the interval [0,1].
Note that this is not band-limited. It produces an infinite number of harmonics, which are aliased back and forth across the frequency spectrum.
The input time array.
Duty cycle. Default is 0.5 (50% duty cycle). If an array, causes wave shape to change over time, and must be the same length as t.
Output array containing the square waveform.
Return a periodic square-wave waveform.
A 5 Hz waveform sampled at 500 Hz for 1 second:
>>> from scipy import signal
... import matplotlib.pyplot as plt
... t = np.linspace(0, 1, 500, endpoint=False)
... plt.plot(t, signal.square(2 * np.pi * 5 * t))
... plt.ylim(-2, 2)
A pulse-width modulated sine wave:
>>> plt.figure()See :
... sig = np.sin(2 * np.pi * t)
... pwm = signal.square(2 * np.pi * 30 * t, duty=(sig + 1)/2)
... plt.subplot(2, 1, 1)
... plt.plot(t, sig)
... plt.subplot(2, 1, 2)
... plt.plot(t, pwm)
... plt.ylim(-1.5, 1.5)
The following pages refer to to this document either explicitly or contain code examples using this.
scipy.signal._waveforms.square
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