Device for correcting the amplitude/frequency characteristic...

H - Electricity – 04 – B

Patent

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H04B 3/14 (2006.01)

Patent

CA 2197236

A device (1) for correcting the amplitude/frequency characteristic of an input signal (FI) having minimum frequency f1, centre frequency f0 and maximum frequency f2, as well as an attenuation characteristic dependent on the frequency increase between f1 and f2. The correcting device (1) provides a corrected output signal (FI). Said correcting device comprises two cascaded filters (41, 42) of which the first receives the input signal (FI) and outputs a filtered signal (SFI) to the second filter, while the second filter provides the corrected output signal (FI). One of said filters is a band rejector filter (41) having centre frequency f3, where f3 is no higher than f1, and the other filter is a band-pass filter (42) having centre frequency f4, where f4 is no lower than f2. Centre frequencies f3 and f4 have the following relationship: f3 x f4 = f0<2>. The filters (41, 42) are of the same order and their overvoltage coefficients are adjusted by a control signal (SC) from a control device (43). The correcting device is particularly suitable for signals from communication cables (40).

L'invention concerne un dispositif de correction (1) de la caractéristique amplitude/fréquence d'un signal d'entrée (FI) de fréquence minimale f1, de fréquence centrale f0 et de fréquence maximale f2, ce signal d'entrée (FI) présentant une caractéristique d'atténuation en fonction de la fréquence croissante entre f1 et f2, le dispositif de correction (1) fournissant un signal de sortie corrigé (FI). Selon l'invention, ce dispositif de correction comporte deux filtres (41, 42) en cascade, le premier des filtres recevant le signal d'entrée (FI) et fournissant un signal filtré (SFI) au second des filtres, le second des filtres fournissant le signal de sortie corrigé (FI). L'un des filtres est un filtre réjecteur de bande (41) de fréquence centrale f3, avec f3 inférieur ou égal à f1, l'autre des filtres étant un filtre passe-bande (42) de fréquence centrale f4, avec f4 supérieur ou égal à f2. Les fréquences centrales f3 et f4 respectent la relation: f3 x f4 - f0 2. Les filtres (41, 42) sont de même ordre et leurs coefficients de surtension sont réglés par un signal de commande (SC) issu d'un dispositif de commande (43). L'invention s'applique notamment aux signaux issus de câbles de transmission (40).

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