Unit-selection synthesis, searching

Once we have found the units by our search, the actual S5mthesis process is often trivial. In pure unit selection, we have stored our units as waveforms, and so a simple overlap and add technique at the waveform boundaries is sufiicient. If we have stored the units in a more parametric representation (e.g. LP coefiicients and residuals), these can be S5mthesized in the same way as with second generation diphone synthesis. Some systems perform spectral smoothing between units, but again this can be performed with the same techniques as with second generation systems. 

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