1. A system for implementing a speech recognition engine, comprising: 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 demiphone acoustic model.