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.

A Spatio-Temporal Auto Regressive Model for Frame Rate Upconversion

Abstract: This paper proposes a spatio-temporal auto regressive (STAR) model for frame rate upconversion. In the STAR model, each pixel in the interpolated frame is approximated as the weighted combination of a sample space including the pixels within its two temporal neighborhoods from the previous and following original frames as well as the available interpolated pixels within its spatial neighborhood in the current to-be-interpolated frame. To derive accurate STAR weights, an iterative self-feedback weight training algorithm is proposed. In each iteration, first the pixels of each training window in the interpolated frames are approximated by the sample space from the previous and following original frames and the to-be-interpolated frame. And then the actual pixels of each training window in the original frame are approximated by the sample space from the previous and following interpolated frames and the current original frame with the same weights. The weights of each training window are calculated by jointly minimizing the distortion between the interpolated frames in the current and previous iterations as well as the distortion between the original frame and its interpolated one. Extensive simulation results demonstrate that the proposed STAR model is able to yield the interpolated frames with high performance in terms of both subjective and objective qualities.

Noise Cancellation using Two Closely Spaced Microphones: Experimental Study witha Specific Model and Two Adaptive Algorithms

Abstract: We consider the speech enhancement problem in a moving car through a blind source separation scheme involving two closely spaced microphones. We propose the use of a double fast Newton transversal filter algorithm (DFNTF) to estimate and suppress coherent noise components from speech, and a model of signal mixtures able to represent correctly the effect of microphones spacing. We also consider the realistic case where the noises at the sensor inputs contain non-coherent components. The simulation results show that the DFNTF algorithm, when controlled by a voice activity detector (VAD), is able to fully cancel the correlated noise components from speech

A Survey of Finite Algebraic Geometrical Structures Underlying Mutually Unbiased Quantum Measurements

Abstract: The basic methods of constructing the sets of mutually unbiased bases in the Hilbert space of an arbitrary finite dimension are discussed and an emerging link between them is outlined. It is shown that these methods employ a wide range of important mathematical concepts like, e.g., Fourier transforms, Galois fields and rings, finite and related projective geometries, and entanglement, to mention a few. Some applications of the theory to quantum information tasks are also mentioned.

Method and system for artificial spatialisation of digital audio signals

Abstract: A method and a system for artificial spatialization of audio-digital signals x(k) making it possible to effect on elementary signals xi(k), replicas of the audio-digital signal, different delays creating delayed elementary signals (seri) summed after weighting with the signal x(k) in order to create the spatialized audio-digital signal y(k). A plurality of linear combinations of the signals (seri) as combined delayed elementary signals (serci) is summed with the elementary signals xi(k). So as to simulate a late reverberation, the linear combinations are effected by a unit loopback, and an attenuation hi(ω), a decaying monotonic function of the reverberation time Tr(ω) to be simulated and proportional to the delay, is effected with each delay. A spectral correction before weighted summation satisfying the relation: ##EQU1## is effected, τi designating the value of each delay, increased by the phase delay due to the attenuation.

Telecommunication network with fixed and mobile subscribers

Abstract: The invention concerns a network comprising access switches (10) each including a table (TAB) containing fixed subscribers-related service data, and at least a nominal database (14) for mobile subscribers accessing the network through several access switches. The nominal database contains, for each of the mobile subscribers, service data of the same type as the fixed subscribers-related service data and mobility management data. The service data table of each access switch via which mobile subscribers can access the network is designed to receive, besides the fixed subscribers-related service data, service data concerning mobile subscribers connected to the network via said access switch, which have been uploaded from the nominal database during procedures locating said mobile subscribers with the access switch.