20. A speech recognition system comprising: means for processing first speech input signal data to preclassify the speech input signal and produce first preclassification output data, wherein the first speech input signal data represents a speech input signal; means for processing second speech input signal data to preclassify the speech input signal and produce second preclassification output data; means, coupled to both means for processing, for determining 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 a preferred mix of the preclassification output data by determining an appropriate balance between speech recognition accuracy of the speech recognition system and a speech recognition processing speed of the speech recognition system; means, coupled to the means for determining, for mixing the first and second preclassification output data in accordance with the determined preferred mix; means, coupled to the means for mixing, for classifying the speech input signal based on the preferred mix of preclassification output data.
21. The speech recognition system of claim 20 further comprising means to provide a noise level parameter output signal to the means for determining.