Text-to-Speech Synthesis with Dynamically-Created Virtual Voices

Text-to-speech synthesis performed by deriving from a voice dataset a sequence of speech frames corresponding to a text, wherein any of the speech frames is represented in the voice dataset by a parameterized vocal tract component, glottal pulse parameters, and an aspiration noise level, transforming the speech frames in the sequence by applying a voice transformation to any of the parameterized vocal tract component, glottal pulse parameters, and aspiration noise level representing the speech frames, wherein the voice transformation is applied in accordance with a virtual voice specification that includes at least one voice control parameter indicating a value for at least one of timbre, glottal tension and breathiness, and producing a digital audio signal of synthesized speech from the transformed sequence of speech frames.