def isUnivariate(signal):
    """ Returns True if `signal` contains univariate samples.

    Parameters
    ----------
    signal : np.array, shape (NUM_SAMPLES, NUM_DIMS)

    Returns
    -------
    is_univariate : bool
    """

    if len(signal.shape) == 1:
        return True
    if signal.shape[1] > 1:
        return False
    return True