15. A system that enhances a speech database for speech synthesis, comprising: a primary speech database; a secondary speech database; and a speech database enhancement module that labels audio files in the primary speech database and the secondary speech database, wherein the primary speech database and the secondary speech database are associated with the same language, enhances the primary speech database by placing the labeled audio files from the secondary speech database into the primary speech database, and stores the enhanced primary speech database for use in unit selection concatenative speech synthesis.
15. A system that enhances a speech database for speech synthesis, comprising: a primary speech database; a secondary speech database; and a speech database enhancement module that labels audio files in the primary speech database and the secondary speech database, wherein the primary speech database and the secondary speech database are associated with the same language, enhances the primary speech database by placing the labeled audio files from the secondary speech database into the primary speech database, and stores the enhanced primary speech database for use in unit selection concatenative speech synthesis. 17. The system of claim 15 , wherein the enhanced primary speech database includes speech segments that are one of syllables, phones, half-phones, diphones, triphones, phonemes, half-phonemes, demi-syllables, and polyphones.