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Speech Synthesis by dyads concatenation produces an intelligible speech, but the lack of prosodic features like rythm and intonation gives the speech an unnatural and unpleasant sound. Having regard to the short-dated applied objectives, It's proving necessary to find a simple set of intonation patterns without taking the complexity of syntactic sentence structuration and the many derived rules into account. Intrinsic characteristics of each dyad are stored and a very simplified grammar is used to surimpose them automatically a pitch pattern, function of the following parameters: Type of sentences, End of each kind of syntagms, words boundaries, and words position inside a sentence.