14. A method for operating a speech recognition system, the method comprising: detecting a speech signal (SI) of a user; analyzing the speech signal to recognize speech information contained in the speech signal (SI); determining a reception quality value (SQ) or a noise value which represents a current reception quality; switching the speech recognition system over to a mode of operation, which is less sensitive to noise when the noise value exceeds a noise threshold or outputting an alert signal (SW) to the user when the reception quality value (SQ) drops below a given reception quality threshold, or both; and automatically resetting the speech recognition system to a previous mode of operation when the reception quality value (SQ) exceeds the reception quality threshold or when the noise value drops below the noise threshold.
17. The method of claim 14 , wherein the reception quality value or the noise value is determined on the basis of a background signal which is received prior to a beginning of an utterance, or in a speech pause of the user, or both.