Search results for "processeur"

showing 3 items of 3 documents

Echo cancellation system for iso-frequency repeaters : contribution to the development of a new generation digital repeater

2014

On-frequency repeaters are a cost-effective solution to extend coverage and enhance wireless communications, especially in shadow areas. However, coupling between the receiving antenna and the transmitting antenna, called radio frequency echo, increases modulation errors and creates oscillations in the system when the echo power is high. According to the communication standards, extremely weak echoes decrease the transmission rate, while strong echoes damage electroni ccircuits because of power peaks. This thesis aims at characterizing the echo phenomenon under different modulations, and proposing an optimized solution directly integrated to industry. We have turned to digital solutions esp…

CoverageRépéteurFiltre adaptatifCouverturePrédistorsion[ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processingEcho cancellationAdaptive filteringMicroprocesseurMicroprocessorDétectionOn-frequencyRepeater[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processingPredistortionIso-fréquenceAnnulation d’échoFPGA[SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
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Extensions matérielles pour processeurs embarqués de traitement d'images.

2007

12p; Le marché des imageurs embarqués est entré dans une ère nouvelle avec l'avènement des téléphones portables munis d'appareils photographiques et de caméras. Il est attendu qu'à l'horizon 2009, leur nombre dépassera celui de l'ensemble des appareils photos vendus depuis l'invention de la photographie, et ce qu'ils soient numériques ou non. Le marché des imageurs électroniques embarqués est donc un secteur porteur, notamment au travers de la téléphonie et de la visiophonie mobile. Les applications ne sont plus limitées à la simple photographie ou la transmission de vidéo ; les lecteurs de codes matrices, la reconnaissance de visages, la biométrie, ou la vision 3D sont des exemples parmi l…

[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR][INFO.INFO-AR] Computer Science [cs]/Hardware Architecture [cs.AR]embarquéCMOSprocesseur[ INFO.INFO-AR ] Computer Science [cs]/Hardware Architecture [cs.AR]imageaméliorationC.1 C.3 C.4 I.4
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Conception d'un outil de prototypage rapide sur le FPGA pour des applications de traitement d'images

2011

This manuscript presents work to propose a development cycle to establish RISP processors in a reprogrammable chip (FPGA). After a description of the various possible solutions to produce image processing prototypes, this document describes a method which consists in generating hardware models of processor target to image processing, with operators just for a given application. Test with a set of common algorithm makes evaluate the performances of the design cycle proposed. Rapid prototyping of a contact less biometric system, based on palmprint recognition, is also realized on the test platform.

[INFO.INFO-OH] Computer Science [cs]/Other [cs.OH]Processeurs RISPTraitement d’images[INFO.INFO-OH]Computer Science [cs]/Other [cs.OH][ INFO.INFO-OH ] Computer Science [cs]/Other [cs.OH]Prototypage rapideNo english keywordsFPGAUn flot de conception
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