17. A speech segment database enhancing system to increase feature variation comprising: a system according to claim 15 to generate compound speech units from a text corpus; and a database engine for creating a database of compound speech units.
17. A speech segment database enhancing system to increase feature variation comprising: a system according to claim 15 to generate compound speech units from a text corpus; and a database engine for creating a database of compound speech units. 18. A speech segment database enhancing system according to claim 17 , wherein a single set of acoustic features is stored for each speech waveform segment referenced by the speech segment database and wherein at least one speech waveform segment has two or more associated linguistic feature vectors.