An algorithm for the Italian atomic time scale

During the past twenty years, the time scale at the IEN has been realized by a commercial cesium clock, selected from an ensemble of five, whose rate has been continuously steered towards UTC to maintain a long term agreement within 3 x 10(exp -13). A time scale algorithm, suitable for a small clock ensemble and capable of improving the medium and long term stability of the IEN time scale, has been recently designed taking care of reducing the effects of the seasonal variations and the sudden frequency anomalies of the single cesium clocks. The new time scale, TA(IEN), is obtained as a weighted average of the clock ensemble computed once a day from the time comparisons between the local reference UTC(IEN) and the single clocks. It is foreseen to include in the computation also ten cesium clocks maintained in other Italian laboratories to further improve its reliability and its long term stability. To implement this algorithm, a personal computer program in Quick Basic has been prepared and it has been tested at the IEN time and frequency laboratory. Results obtained using this algorithm on the real clocks data relative to a period of about two years are presented

A search and retrieval framework for the management of copyrighted audiovisual content

This paper presents a search and retrieval framework that enables the management of Intellectual Property in the World Wide Web. This twofold framework helps users to detect digital rights infringements of their copyrighted content. In order to detect possible copyright infringments, first the system crawls the Web to search replicas of user’s images, and later evaluates if the copies have been taken respecting the terms stated by the owner. On the other hand, this framework also helps users in finding something interesting in the Web. It will provide copyrighted content to users according to their preferences and to intellectual property rights integrating search and retrieval with digital rights management tools

Method apparatus and system for robust video transmission

La tecnica proposta è finalizzata a migliorare l’efficienza di codifica di un codificatore video standard quando la trasmissione avviene su canale rumoroso soggetto a perdite di pacchetti. Un flusso di dati secondario viene affiancato al flusso principale al fine di correggere gli errori introdotti dalle perdite e di arrestare la propagazione temporale degli stessi. Tale flusso secondario viene codificato secondo tecniche mediate dalla codifica di sorgenti distribuite