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Les codages d'une information binaire en Infomatique Industrielle
Dossier complet sur les codages d'une information binaire en Infomatique Industrielle (RZ, NRZ, NRZI, MANCHESTER, MANCHESTER différentiel, Miller, CMI, MLT3, Bipolaire simple et entrelacé, HDBn, ainsi que les codes à transformation de Valence
Réalisé dans le cadre de l'IUT, 1ère année

Abstract
Coding is the operation witch realizes the correspondence between a logical state and a physical value. The applications of the industrial data processing, in Internet and other networks, required the use of new methods of coding adapted to this various employment and their own needs. There are two principal categories of coding, the binary codes and the codes on multiple levels. But there are two sub-groups in those categories, which not use the same kind of coding. One's, the coding by levels, makes correspond in a logical state, a level of voltage whereas the other, the coding by transition, uses a jump of voltage to code data. The transition is used to reduce the error rate at the time of the reception. Moreover, certain codes use the output signal to remake the clock. A lot of problems can deteriorate the quality of a code, they are mainly induced by the characteristics of the physical support. An electric signal, current, frequency, and voltage can be parasitized, attenuated, or filtered by his surroundings. With a coding by level of voltage, the use of the null voltage is doubtful for the receiver because the tension received at the time of a loss of transmission, is null too. Moreover, when a continuation from several 0 or 1 occurs, the receiver cannot distinguish the clock into the signal. However the method of coding by transition reduce the maximum flow, so it's not better. The risk of inversion of wire was also studied, and others codings known as differential were conceived. The purpose of the codes with transformation of valence is coding several bits by front of clock.

Screenshot

Author
Julien Michot
Size
529ko
Date of creation
2003
Downloads
Report 291
       

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