1. A process of voice recognition, comprising the steps of: performing a coarse recognition of acquired samples, said coarse recognition being based on searching a syntax base, supplying the N best phrases recognized after comparing results of said coarse recognition with stored acoustic references, determining phonetic components of said acquired samples by performing an acoustico-phonetic decoding on said acquired samples, choosing a most appropriate phrase from said N best phrases by comparing said N best phrases with models of probable dialogues and with said phonetic components, and updating said syntax base as a function of a history of most appropriate phrases chosen in said choosing step.