33. A speech recognition system comprising: a first speech signal preprocessor to receive first input data representing a speech input signal and having first speech input signal preclassifying output data; a second speech signal preprocessor to receive second input data representing the speech input signal and having second speech input signal preclassifying output data; a mixer to receive the first and second speech input signal preclassifying output data and having output data represented by a selected mix of the first and second speech input signal preclassifying output data; a selection control circuit coupled to the mixer to determine when to include the first speech input signal, the second speech input signal, and a combination of the first and second speech input signals in the selected mix; a speech classifier to receive the selected mix and having output data to classify the speech input signal as recognized speech; and a noise level detector to provide a noise level parameter output signal to the selection control circuit.
33. A speech recognition system comprising: a first speech signal preprocessor to receive first input data representing a speech input signal and having first speech input signal preclassifying output data; a second speech signal preprocessor to receive second input data representing the speech input signal and having second speech input signal preclassifying output data; a mixer to receive the first and second speech input signal preclassifying output data and having output data represented by a selected mix of the first and second speech input signal preclassifying output data; a selection control circuit coupled to the mixer to determine when to include the first speech input signal, the second speech input signal, and a combination of the first and second speech input signals in the selected mix; a speech classifier to receive the selected mix and having output data to classify the speech input signal as recognized speech; and a noise level detector to provide a noise level parameter output signal to the selection control circuit. 34. The speech recognition system of claim 33 wherein the noise level detector comprises a noise level detection sensor to detect noise levels which may corrupt at least one of the first input data and the second input data.