14. The speech recognition system of claim 13 , wherein a first weighting factor is selected when the amount of change is less than a predetermined threshold and a second weighting factor is selected when the amount of change exceeds the predetermined threshold.
14. The speech recognition system of claim 13 , wherein a first weighting factor is selected when the amount of change is less than a predetermined threshold and a second weighting factor is selected when the amount of change exceeds the predetermined threshold. 15. The speech recognition system of claim 14 , wherein the first weighting factor is 0.2 and the second weighting factor is 0.6.