Module « scipy.signal »

Fonction boxcar - module scipy.signal

Signature de la fonction boxcar

def boxcar(*args, **kwargs) 

Description

boxcar.__doc__

Return a boxcar or rectangular window.

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

    .. warning:: scipy.signal.boxcar is deprecated,
                 use scipy.signal.windows.boxcar instead.

    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 : ndarray
        The window, with the maximum value normalized to 1.

    Examples
    --------
    Plot the window and its frequency response:

    >>> from scipy import signal
    >>> from scipy.fft import fft, fftshift
    >>> import matplotlib.pyplot as plt

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

    >>> plt.figure()
    >>> A = fft(window, 2048) / (len(window)/2.0)
    >>> freq = np.linspace(-0.5, 0.5, len(A))
    >>> response = 20 * np.log10(np.abs(fftshift(A / abs(A).max())))
    >>> plt.plot(freq, 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]")