4. The system of claim 1 , wherein the module configure to control the processor to adjust boundaries of the unit labels using spectral boundary correction further: combines HMM-based segmentation with spectral features to reduce misalignments between target unit boundaries and boundaries assigned by the HMM-based segmentation.
1. A system that concatenates speech units to produce synthetic speech, the system comprising: a processor; a module configured to control the processor to train a set of Hidden Markov Models (HMMs) using seed data in a first iteration; a module configured to control the processor to align the set of HMMs to produce segmented unit labels; and a module configured to control the processor to adjust boundaries of the unit labels using spectral boundary correction, wherein the unit labels having adjusted boundaries are used to concatenate speech units to synthesize speech.