Tap antenna unit

Details Tap antenna unit Tap antenna unit

H - Electricity

04

N

H04N 7/10 (2006.01) H04N 7/173 (2006.01) H04N 5/44 (2006.01) H04N 5/775 (2006.01) H04H 1/00 (2006.01) H04H 1/02 (2006.01)

Patent

CA 2318877

The tap antenna unit includes signal splitting circuitry (12), coupled to a coaxial cable (14) which is servicing a consumer electronic device, such as a television set, for splitting off a signal from the coaxial cable (14); a filter (16) coupled to an output of the signal splitting circuitry (12) for selecting a low-level sharp frequency band in the energy spectrum of the coaxial cable; circuitry for demodulating (20) a signal carried by the low- level frequency band; circuitry for modulating (22) the output signal onto a carrier in an unlicensed frequency band; and an output antenna (28 or 52) which is coupled to the modulating circuitry (22) and which is capable of transmitting the output modulated signal over a limited transmitting-receiving area.

Cette antenne de dérivation comprend un circuit séparateur de signaux (12), couplé à un câble coaxial (14) alimentant un dispositif électronique de consommateur tel qu'un téléviseur, et qui sépare un signal du câble coaxial (14); un filtre (16) relié à une sortie du circuit séparateur de signaux (12) qui sélectionne une bande de fréquence nette de faible puissance dans le spectre énergétique du câble coaxial; un circuit de démodulation (20) du signal transmis par la bande de faible puissance; un circuit de modulation (22) permettant de moduler le signal de sortie sur une porteuse dans une bande de fréquence non protégée; et une antenne de sortie (28 ou 52) raccordée au circuit de modulation (22) et capable de transmettre le signal modulé de sortie à l'intérieur d'une zone limitée d'émission-réception.

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