Triax transmitter and receiver interfaces and transmission...

Details Triax transmitter and receiver interfaces and transmission... Triax transmitter and receiver interfaces and transmission...

H - Electricity

04

N

H04N 5/38 (2006.01) H04N 5/40 (2006.01) H04N 5/455 (2006.01) H04N 7/015 (2006.01)

Patent

CA 2511329

A triax transmitter interface (3) for transmitting a video signal on a triax cable (11) comprises a video signal input port (2), a first modulator (4) for modulating a luminance component ([Y]) of a video signal received at said input port (2) onto a first carrier and a second modulator (5) for modulating a chrominance component ([B-Y], [R-Y]) of the video signal onto a second carrier, and a triax output port (10) for outputting said modulated carriers to a triax cable (11). The first modulator (4) is a quadrature modulator (4) adapted to modulate luminance components of two video image lines simultaneously and in quadrature onto said first carrier. A receiver interface (18) has a quadrature demodulator (26) for restoring the luminance component ([Y]).

Une interface de transmetteur (3) qui permet de transmettre un signal vidéo sur un câble triaxial (11) comprend les éléments qui suivent. Un point d'entrée de signal vidéo (2), un premier modulateur (4) pour moduler une composante de luminance (¬Y|) d'un signal vidéo reçu audit point d'entrée (2) sur une première porteuse, et un second modulateur (5), pour moduler une composante de chrominance (¬B-Y|, ¬R-Y|) du signal vidéo sur une seconde porteuse, et un point de sortie triaxial (10) pour appliquer lesdites porteuses modulées à un câble triaxial (11). Le premier modulateur (4) est un modulateur en quadrature (4) adapté pour moduler simultanément les composantes de luminance de deux images vidéo et en quadrature sur ladite première porteuse. Une interface de récepteur (18) comprend un démodulateur en quadrature (26) pour restituer la composante de luminance (¬Y|).

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