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{\title Dans l\'92espace suivant de l\'92exposition Cybermonde, vous allez pouvoir comparer les donn\'e9es de type analogique et num\'e9rique :}{\author MMLT}{\operator MMLT}{\creatim\yr1998\mo10\dy3\min15}{\revtim\yr1998\mo10\dy3\min15}{\version2}
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\par 
\par }\pard \qj\ri850\nowidctlpar\widctlpar\adjustright {
\par 
\par 
\par Dans l\rquote espace suivant de l\rquote exposition Cybermonde, vous allez pouvoir comparer les donn\'e9es de type analogique et num\'e9rique\~:
\par 
\par 
\par 
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\dpfillfgcr255\dpfillfgcg255\dpfillfgcb255\dpfillbgcr0\dpfillbgcg0\dpfillbgcb255\dpfillpat1\dplinehollow}}}}{\f18\fs48\cf2 Analogique ou num\'e9rique\~:
\par }{
\par Sur le premier panneau, \'e0 droite de la partie \ldblquote \~ La transmission de l"information\~\rdblquote , tu vas trouver deux panneaux expliquant la diff\'e9rence entre un signal (sonore ou visuel) transcrit de mani\'e8re analogique ou de mani\'e8
re num\'e9rique.
\par 
\par 
\par 
\par }{\fs28\cf5 Un signal analogique}{ ressemble \'e0 l'\'e9l\'e9ment naturel qui l'a cr\'e9\'e9 (exemple du son avec la voix, de l\rquote image sur la photo avec ses taches plus ou moins fonc\'e9es).
\par 
\par 
\par }{\fs28\cf6 Le signal num\'e9rique}{ est une fa\'e7on de traduire le signal analogique en valeurs math\'e9matiques que certaines machines savent lire ensuite.
\par 
\par 
\par 
\par Il t\rquote est propos\'e9 d\rquote ailleurs d\rquote effectuer une petite exp\'e9rience sur 2 postes de t\'e9l\'e9vision utilisant 3 sc\'e8nes diff\'e9rentes\~avec les deux modes de transmission\~: analogique ou num\'e9rique.
\par 
\par 
\par }{\ul Lexique:}{ des images ou signaux sonores compress\'e9s peuvent l'\'eatre quand ils sont transform\'e9s en codes math\'e9matiques . La compression se fait par des op\'e9rations math\'e9matiques complexes.
\par }{\f18\fs48\cf2 
\par 
\par }}

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