transmitter, receiver and system for triax cable video transmission with hdtv option

摘要

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]).