Orange S.A.

About: Orange S.A. is a company organization based out in Paris, France. It is known for research contribution in the topics: Terminal (electronics) & Signal. The organization has 6735 authors who have published 9190 publications receiving 156440 citations. The organization is also known as: Orange SA & France Télécom.

Fault Detection and Diagnosis in Distributed Systems: An Approach by Partially Stochastic Petri Nets

Abstract: We address the problem of alarm correlation in large distributed systems. The key idea is to make use of the concurrence of events in order to separate and simplify the state estimation in a faulty system. Petri nets and their causality semantics are used to model concurrency. Special partially stochastic Petri nets are developed, that establish some kind of equivalence between concurrence and independence. The diagnosis problem is defined as the computation of the most likely history of the net given a sequence of observed alarms. Solutions are provided in four contexts, with a gradual complexity on the structure of observations.

Voice synthesis system

Abstract: A voice synthesis system for interactive voice services comprises a voice server connected to a packet network dispensing a voice service to a user terminal by executing a service file associated with the voice service. An HTTP client in the voice server transmits a request containing a text to be synthesized during execution of the service file. The service file includes an address designating a resource in a voice synthesis server connected to the packet network and a command responsive to the audio format for commanding the transmitting of the request to the voice synthesis server. An HTTP server in the voice synthesis server transmits to the voice server an audio response including the text that has been synthesized by the voice synthesis server independently of the voice server.

Method for a maximum likelihood decoding of a convolutional code with decision weighting, and corresponding decoder

Abstract: A method for the decoding of digital data obtained according to a convolutional coding and transmitted on a noise-ridden channel aimed at improving the methods of maximum likelihood decoding such as the Viterbi algorithm consisting in associating, with each estimation s(t) of the corresponding source digital element a(t), a weighting coefficient m(t) representing the reliability of the estimation s(t), the estimation s(t) taking account of the values of a first series of L received samples, and the weighting m(t) taking account of the values of a second series of N samples received, N being strictly greater than L. In a preferred embodiment, a second trellis is associated with the standard first decoding trellis, a trace-back being done in the second trellis on two concurrent paths, used to revise the weighting coefficients obtained at output of the first trellis.

A new contactless smart card IC using an on-chip antenna and an asynchronous microcontroller

Abstract: This paper describes a new generation of contactless smart card chip which integrates an on-chip coil connected to a power reception system and an emitter/receiver module compatible with the ISO 14443 standard, together with an asynchronous quasi-delay insensitive (QDI) 8-bit microcontroller. Beyond the contactless smart card application field, this new chip demonstrates that system-on-chip integrating power reception and management, radio-frequency communication, and signal processing is feasible. It associates analog/digital parts as well as synchronous/asynchronous logics and has been fabricated in a CMOS six metal layers 0.25-/spl mu/m technology from STMicroelectronics.