20. A non-transitory computer readable medium which stores a text-to-speech component comprising executable code that directs a client computing device to perform a process comprising: receiving text comprising a sequence of words; and assembling an audio presentation corresponding to the text, the audio presentation comprising a sequence of speech segments, wherein the sequence of speech segments is based at least in part on the sequence of words, and wherein assembling the audio presentation comprises: retrieving a first compressed speech segment; applying two decompression techniques to the first compressed speech segment to obtain a first speech segment; retrieving a second compressed speech segment; applying two decompression techniques to the second compressed speech segment to obtain a second speech segment; concatenating the first speech segment and the second speech segment.
20. A non-transitory computer readable medium which stores a text-to-speech component comprising executable code that directs a client computing device to perform a process comprising: receiving text comprising a sequence of words; and assembling an audio presentation corresponding to the text, the audio presentation comprising a sequence of speech segments, wherein the sequence of speech segments is based at least in part on the sequence of words, and wherein assembling the audio presentation comprises: retrieving a first compressed speech segment; applying two decompression techniques to the first compressed speech segment to obtain a first speech segment; retrieving a second compressed speech segment; applying two decompression techniques to the second compressed speech segment to obtain a second speech segment; concatenating the first speech segment and the second speech segment. 21. The non-transitory computer readable medium of claim 20 , wherein the first speech segment corresponds to a word or subword unit.