3. The method as claimed in claim 1 , wherein identifying said constrained phoneme of said constrained speech recognition outside said recognition domain based on said confidence measures comprises: identifying phonemes of said constrained speech recognition with confidence measures that meet a given criterion.
3. The method as claimed in claim 1 , wherein identifying said constrained phoneme of said constrained speech recognition outside said recognition domain based on said confidence measures comprises: identifying phonemes of said constrained speech recognition with confidence measures that meet a given criterion. 4. The method as claimed in claim 3 , wherein identifying phonemes of said constrained speech recognition with confidence measures that meet a given criterion further include normalizing the constrained speech confidence measures by: computing instantaneous confidence scores as a temporal average of said confidence measures within a moving window; and identifying phonemes of said constrained speech recognition with instantaneous confidence scores that meet a first relation.