11. The non-transitory machine-readable medium of claim 6 , wherein each of the multiple source voice entries is associated with a different feature vector, each of the associated feature vectors includes values of a set of linguistic features for the codebook training speech segment for which the associated source voice entry models the prosodic component of the source voice, data for each of the source voice passage segments includes a feature vector that includes values of the set of linguistic features for that source voice passage segment, and operation (b) includes, for each source voice passage segment, (b1) identifying multiple candidate source voice entries based the transform coefficient comparisons, and (b2) selecting the identified target voice entry based on a comparison of the feature vector for the source voice passage segment with each of the feature vectors associated with the multiple candidate source voice entries identified in (b1).
11. The non-transitory machine-readable medium of claim 6 , wherein each of the multiple source voice entries is associated with a different feature vector, each of the associated feature vectors includes values of a set of linguistic features for the codebook training speech segment for which the associated source voice entry models the prosodic component of the source voice, data for each of the source voice passage segments includes a feature vector that includes values of the set of linguistic features for that source voice passage segment, and operation (b) includes, for each source voice passage segment, (b1) identifying multiple candidate source voice entries based the transform coefficient comparisons, and (b2) selecting the identified target voice entry based on a comparison of the feature vector for the source voice passage segment with each of the feature vectors associated with the multiple candidate source voice entries identified in (b1). 12. The non-transitory machine-readable medium of claim 11 , wherein the selecting in operation (b2) is also based on comparison of a duration of the source voice passage segment with durations of each of the candidate source voice entries identified in (b1).