cupyx.scipy.signal.windows.boxcar#

cupyx.scipy.signal.windows.boxcar(M, sym=True)[source]#

Return a boxcar or rectangular window.

Also known as a rectangular window or Dirichlet window, this is equivalent to no window at all.

Parameters:

M (int) – Number of points in the output window. If zero or less, an empty array is returned.
sym (bool, optional) – Whether the window is symmetric. (Has no effect for boxcar.)

Returns:

w – The window, with the maximum value normalized to 1.

Return type:

ndarray

Examples

Plot the window and its frequency response:

>>> from cupyx.scipy.signal.windows import boxcar
>>> import cupy
>>> from cupy.fft import fft, fftshift
>>> import matplotlib.pyplot as plt

>>> window = boxcar(51)
>>> plt.plot(cupy.asnumpy(window))
>>> plt.title("Boxcar window")
>>> plt.ylabel("Amplitude")
>>> plt.xlabel("Sample")

>>> plt.figure()
>>> A = fft(window, 2048) / (len(window)/2.0)
>>> freq = cupy.linspace(-0.5, 0.5, len(A))
>>> response = 20 * cupy.log10(cupy.abs(fftshift(A / cupy.abs(A).max())))
>>> plt.plot(cupy.asnumpy(freq), cupy.asnumpy(response))
>>> plt.axis([-0.5, 0.5, -120, 0])
>>> plt.title("Frequency response of the boxcar window")
>>> plt.ylabel("Normalized magnitude [dB]")
>>> plt.xlabel("Normalized frequency [cycles per sample]")