7. A method of operating a speech communications system in a vehicle, the method which comprises: detecting audio information with a microphone system provided in a vehicle interior, the microphone system including a first microphone array and a second microphone array, each of the microphone arrays including at least two microphones that do not operate as loudspeakers and that are not configured to be switched to an audio playback state, the at least two microphones of the first microphone array being disposed at respective positions which define a direction and a normal with respect to the direction such that the normal and the direction intersect at a center of the first microphone array, the at least two microphones of the second microphone array being disposed at respective positions which define a direction and a normal with respect to the direction such that the normal and the direction intersect at a center of the second microphone array, the center of the first microphone array and the center of the second microphone array being spaced from one another by a given spacing distance wherein the first microphone array is disposed on a first side of the vehicle interior and the second microphone array is disposed on a second side of the vehicle interior; running an interruptible text-to-speech operation based on a dialog context in order to provide a speech output; running a speech recognition operation for providing a speech recognition result; requesting voice information for a maximum number of times if insufficient voice information or no voice information is provided in response to the speech output provided by the interruptible text-to-speech operation; saving a dialog context of an unfinished speech interaction; determining a first sound source angle as a function of audio information provided by the first microphone array of the microphone system; determining a second sound source angle as a function of audio information provided by the second microphone array of the microphone system; and determining a positional sound source location based on the first sound source angle and the second sound source angle.
14. The method according to claim 7 , which comprises: determining a positional sound source location in the vehicle interior; and selectively enabling and disabling a user-controllable function in dependence on the positional sound source location.