def increase_frequency(self, frequency=None):
        """
        Increases the frequency.

        :param frequency: the frequency to increase by, 1 if None
        :type frequency: int
        """
        if frequency is None:
            javabridge.call(self.jobject, "increaseFrequency", "()V")
        else:
            javabridge.call(self.jobject, "increaseFrequency", "(I)V", frequency)
Increases the frequency.

        :param frequency: the frequency to increase by, 1 if None
        :type frequency: int