4. A system for reducing a search space for a recognition grammar used when interpreting natural language speech utterances, the system comprising: at least one input device that receives an utterance from a user and generates an electronic signal corresponding to the utterance; and a speech interpretation engine that receives the electronic signal corresponding to the utterance, the speech interpretation engine operable to: create a phonemic representation of acoustic elements associated with an acoustic speech model, the acoustic elements including at least an unstressed central vowel and plurality of phonemic elements; represent syllables associated with the acoustic speech model using the phonemic representation, each of the represented syllables including a series of acoustic elements; construct an acoustic grammar that contains transitions between the acoustic elements of the represented syllables, the transitions constrained according to phonotactic rules of the acoustic speech model; and use the unstressed central vowel as a linking element between sequential phonemic elements contained in the constructed acoustic grammar.
4. A system for reducing a search space for a recognition grammar used when interpreting natural language speech utterances, the system comprising: at least one input device that receives an utterance from a user and generates an electronic signal corresponding to the utterance; and a speech interpretation engine that receives the electronic signal corresponding to the utterance, the speech interpretation engine operable to: create a phonemic representation of acoustic elements associated with an acoustic speech model, the acoustic elements including at least an unstressed central vowel and plurality of phonemic elements; represent syllables associated with the acoustic speech model using the phonemic representation, each of the represented syllables including a series of acoustic elements; construct an acoustic grammar that contains transitions between the acoustic elements of the represented syllables, the transitions constrained according to phonotactic rules of the acoustic speech model; and use the unstressed central vowel as a linking element between sequential phonemic elements contained in the constructed acoustic grammar. 6. The system of claim 4 , the unstressed central vowel including a schwa acoustic element.