2. A method of recognizing speech according to claim 1, wherein the rejection factor comprises a threshold modeled as a polynomial in utterance length T, and wherein a separate rejection threshold v.sub.i, is derived for each interval representing the input utterance lengths.
2. A method of recognizing speech according to claim 1, wherein the rejection factor comprises a threshold modeled as a polynomial in utterance length T, and wherein a separate rejection threshold v.sub.i, is derived for each interval representing the input utterance lengths. 3. A method of recognizing speech according to claim 2, wherein said polynomial is approximated by a piecewise constant approximation.