Digital filter

G - Physics – 06 – K

Patent

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Details

G06K 7/08 (2006.01) G01S 13/74 (2006.01) G01S 13/75 (2006.01)

Patent

CA 2226897

In a bandpass filter, a first cyclical analogue signal V3 at a centre frequency divided by integer N in divider (44) and the divided signal supplied to a digital filter (48) as its system clock; a second cyclical analogue signal at a frequency to be measured, differing by a small amount from the centre frequency, is delayed by N cycles by a dynamic store (54); a subtractor (56) subtracts the second signal from the delayed second signal and supplies any difference to the digital filter (48); the output of the digital filter is related to the frequency of the second signal, but the centre frequency is suppressed. The filter may be used in an interrogation for an electronic detection system in which an interrogation signal is modified in frequency by a small amount, characteristic of a device to be detected.

Dans un filtre passe-bande, un premier signal analogique cyclique (V3) dont la fréquence centrale est divisée par un nombre entier N dans le diviseur (44). Le signal divisé est fourni à un filtre numérique (48) en tant qu'horloge système dudit filtre. Un second signal analogique cyclique, transmis à une fréquence à mesurer qui diffère légèrement de la fréquence centrale, est retardée de N cycles par une mémoire dynamique (54). Un soustracteur (56) soustrait le second signal au second signal différé et transmet toute différence au filtre numérique (48); le signal de sortie du filtre numérique dépend de la fréquence du second signal, mais la fréquence centrale est supprimée. Ce filtre peut être utilisé pour interroger un système de détection électronique où la fréquence d'un signal d'interrogation est modifiée à un faible niveau caractéristique d'un dispositif qui doit être détecté.

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