    def __init__(self, screen, signal=None, jitter=6, **kwargs):
        """
        :param screen: The Screen being used for the Scene.
        :param signal: The renderer to use as the 'signal' in the white noise.
        :param jitter: The amount that the signal will jump when there is noise.

        Also see the common keyword arguments in :py:obj:`.Effect`.
        """
        super().__init__(screen, **kwargs)
        self._signal = signal
        self._strength = 0.0
        self._step = 0.0
        self._jitter = jitter
:param screen: The Screen being used for the Scene.
:param signal: The renderer to use as the 'signal' in the white noise.
:param jitter: The amount that the signal will jump when there is noise.

Also see the common keyword arguments in :py:obj:`.Effect`.
asciimatics/effects.py