6. The speech dialog system of claim 4 , where the speech dialog control unit is configured to generate an output message to instruct a user to neutralize a noise source when the noise component of the speech input signal is above a predetermined threshold.
4. The speech dialog system of claim 1 , where the signal pre-processor unit is configured to determine a noise component of the speech input signal; and where the analysis signal comprises information related to the noise component of the speech input signal.