Restitution of an analog signal by filtering

Details Restitution of an analog signal by filtering Restitution of an analog signal by filtering

H - Electricity

03

M

350/82, 354/97

H03M 1/00 (2006.01) H04B 14/04 (2006.01) H04N 1/40 (2006.01)

Patent

CA 1196421

ABREGE Selon l'invention le signal pseudoanalogique Y obtenu par double conversion analogique/numérique, numérique/ analogique d'un signal analgique est applique à un filtre actif dont l'impédance est commandée par la dérivée absolue de la valeur positive dudit signal pseudoanalogique Y, dérivée obtenue au moyen d'un circuit comprenant un dérivateur RC recevant le signal pseudoanalogique Y et une mémoire M effectuant la commande de la valeur de l'impédance dudit filtre. L'invention s'applique notamment à la restitution de documents graphiques ou iconographiques préalablement encodés par méthodes numériques.

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