signal.py 文件源码

def cw(fc, duration, fs, window=None):
    """Generate a sinusoidal pulse.

    :param fc: frequency of the pulse in Hz
    :param duration: duration of the pulse in s
    :param fs: sampling rate in Hz
    :param window: window function to use (``None`` means rectangular window)

    For supported window functions, see documentation for :func:`scipy.signal.get_window`.

    >>> import arlpy
    >>> x1 = arlpy.signal.cw(fc=27000, duration=0.5, fs=250000)
    >>> x2 = arlpy.signal.cw(fc=27000, duration=0.5, fs=250000, window='hamming')
    >>> x3 = arlpy.signal.cw(fc=27000, duration=0.5, fs=250000, window=('kaiser', 4.0))
    """
    n = int(round(duration*fs))
    x = _np.sin(2*_np.pi*fc*time(n, fs))
    if window is not None:
        w = _sig.get_window(window, n)
        x *= w
    return x