A wired television broadcasting system is disclosed in which a plurality of programme signals are made available on separate conductive paths to each of a plurality of programme selectors controllable by respective subscribers to the system, the conductive paths defining channels. In order to reduce cross-view coupling, the channels are arranged in one or more groups divided into a plurality of pairs of channels, each channel operating at the same nominal carrier frequency with the two channels of each said pair operating at carrier frequencies offset relative to each other by an odd integral multiple of half the line frequency, and the phase of the carriers on the two channels of any one said pair being the same with the phase of any two pairs in the group differing by an integral multiple of 90.degree..
A dynamic audio-video interconnection system for connecting together at least one television receiver and a plurality of peripheral units in home audio-visual installations. By means of a remote-control keyboard, the user transmits interconnection orders which are processed by a microprocessor in order to actuate electronic switches which effect the desired interconnection.
