1. A speech producing apparatus comprising: input means for receiving a sequence of input data, said sequence of input data including a first part containing a sequence of phonological linguistic unit indicia and a second part including at least word boundary indicia indicative of word boundaries; control means connected to said input means for converting said sequence of input data into a sequence of speech identifying data by (1) substituting internal phonological linguistic unit indicia for word final phonological linguistic unit indicia occurring at word endings where vocalic phonological lignuistic unit indicia are beginning the next word, and (2) substituting shorter strong vowel phonological linguistic unit indicia for long strong vowel phonological linguistic unit indicia occurring in nonfinal word positions; and speech synthesis means connected to said control means for generating one or more audible words of human language corresponding to said sequence of speech identifying data.