Source : Free On-Line Dictionary of Computing

speech synthesis
     
        The generation of an sound waveform of human speech from a
        textual or phonetic description.  See also {speech
        recognition}.
     
        There are demonstrations which {say a number
        (http://www.cs.yale.edu/cgi-bin/saynumber.au)} or {say a
        phrase (http://wwwtios.cs.utwente.nl/say/form/)}.