def detect_head(self, min_head_length=None, max_head_length=None):
        """
        Detect the audio head, returning its duration, in seconds.

        :param min_head_length: estimated minimum head length
        :type  min_head_length: :class:`~aeneas.exacttiming.TimeValue`
        :param max_head_length: estimated maximum head length
        :type  max_head_length: :class:`~aeneas.exacttiming.TimeValue`
        :rtype: :class:`~aeneas.exacttiming.TimeValue`
        :raises: TypeError: if one of the parameters is not ``None`` or a number
        :raises: ValueError: if one of the parameters is negative
        """
        return self._detect(min_head_length, max_head_length, tail=False)
Detect the audio head, returning its duration, in seconds.

        :param min_head_length: estimated minimum head length
        :type  min_head_length: :class:`~aeneas.exacttiming.TimeValue`
        :param max_head_length: estimated maximum head length
        :type  max_head_length: :class:`~aeneas.exacttiming.TimeValue`
        :rtype: :class:`~aeneas.exacttiming.TimeValue`
        :raises: TypeError: if one of the parameters is not ``None`` or a number
        :raises: ValueError: if one of the parameters is negative