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A computer program for the automatic translation of any text of Italian into naturally fluent synthetic speech is presented. The program, or Phonological Processor (hence FP) maps into prosodic structures the phonological rules of Italian. Structural information is provided by such hierarchical prosodic constituents as Syllable (S), Metrical Foot (HF), Phonological Word (PW), Intonational Group (IG). Onto these structures, phonological rules are applied such as the " l e t t e r - t o sound" rules, automatic word stress rules,internal stress hierarchy rules indicating secondary stress,external sandhi rules, phonological focus assignment rules, logical focus assignment rules | Rodolfo Delmonte Centro Linguistico Interíacoltà ưniversità degli Studi di Venezia Ca Garzoni-Moro - s. Marco 3417 ABSTRACT A computer program for the automatic translation of any text of Italian into naturally fluent synthetic speech is presented. The program or Phonological Processor hence FP maps into prosodic structures the phonological rules of Italian. Structural information is provided by such hierarchical prosodic constituents as Syllable s Metrical Foot MF Phonological Word PW Intonational Group IG . Onto these structures phonological rules are applied such as the letter-to-sound rules automatic word stress rules internal stress hierarchy rules indicating secondary stress external sandhi rules phonological focus assignment rules logical focus assignment rules. The FP constitutes also a model to simulate the reading process aloud and the psycholinguistics and cognitive aspects related will be discussed in the computational model of the FP . At present Logical Focus assignment rules and the computational model are work in progress still to be implemented in the FP. Recorded samples of automatically produced synthetic speech will be presented at the conference to illustrate the functioning of the rules. 0. Introduction The FP which we shall describe in detail in the following pages is the terminal section of a system of speech synthesis by rule without vocabulary restrictions implemented at the Centre of Computational Sonology of the University of Padua. From the linguistic point of view the fP is a model to simulate the operations carried out by an Italian speaker when reading aloud any text. To this end the speaker shall use the rules of his internal grammar to translate graphic signs into natural speech. These rules will have to be implemented in the FP together with a computational mechanism simulating the psychological and cognitive functions of the reading process. 1. The Phonological Rules At the phonological level the FP has to account for low level