16. The system of claim 12 , wherein extracting speech features from the plurality of recorded reference speech utterances of the reference speaker comprises decomposing the recorded reference speech utterances of the reference speaker into reference temporal frames of parameterized reference speech units, wherein each reference temporal frame corresponds to a respective reference-speaker vector of speech features that include at least one of spectral envelope parameters, aperiodicity envelope parameters, fundamental frequencies, or voicing, of a respective reference speech unit, and wherein extracting speech features from the recorded colloquial speech utterances of the respective colloquial speaker comprises decomposing the recorded colloquial speech utterances of the respective colloquial speaker into colloquial temporal frames of parameterized colloquial speech units, wherein each colloquial temporal frame corresponds to a respective colloquial-speaker vector of speech features that include at least one of spectral envelope parameters, aperiodicity envelope parameters, fundamental frequencies, or voicing, of a respective colloquial speech unit.
16. The system of claim 12 , wherein extracting speech features from the plurality of recorded reference speech utterances of the reference speaker comprises decomposing the recorded reference speech utterances of the reference speaker into reference temporal frames of parameterized reference speech units, wherein each reference temporal frame corresponds to a respective reference-speaker vector of speech features that include at least one of spectral envelope parameters, aperiodicity envelope parameters, fundamental frequencies, or voicing, of a respective reference speech unit, and wherein extracting speech features from the recorded colloquial speech utterances of the respective colloquial speaker comprises decomposing the recorded colloquial speech utterances of the respective colloquial speaker into colloquial temporal frames of parameterized colloquial speech units, wherein each colloquial temporal frame corresponds to a respective colloquial-speaker vector of speech features that include at least one of spectral envelope parameters, aperiodicity envelope parameters, fundamental frequencies, or voicing, of a respective colloquial speech unit. 19. The system of claim 16 , wherein the reference speech units each correspond to one of a phoneme or a triphone, and wherein the colloquial speech units each correspond to one of a phoneme or a triphone.