demiphone acoustic models that said speech recognition engine utilizes to perform speech recognition procedures, said demiphone acoustic models each having three states that collectively form a preceding demiphone and a succeeding demiphone; and

an acoustic model generator that analyzes speech context information to configure each of said demiphone acoustic models as either a succeeding-dominant demiphone acoustic model or a preceding-dominant dominant demiphone acoustic model, a contextual dominance for each demiphone state from a given one of said demiphone acoustic models being determined by analyzing predominant contextual information in a triphone decision tree corresponding to said each demiphone state.