Wide band communication system transmitting video and audio signals among a plurality of users
First Claim
1. In a wide band communication system in which a plurality of users employing work stations are each connected to a switching node via communication lines, the work stations receiving and/or transmitting audio signals, video signals and data, the switching node comprising:
- control means, responsive to signals produced by said work stations on said communication lines, for generating signaling messages identifying the presence of a video signal on a said communication line;
coupling means, responsive to said signalling messages generated by said control means, for selectively coupling a communication line to a selected one of a plurality of internodal lines connected to a selected additional switching node, said coupling means selecting a video path within said node between a said communication line and a said internodal line when the presence of a video signal is identified by said control means; and
coding means, disposed in said video path, for selectively concentrating or expanding said video signal.
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Accused Products
Abstract
It is described a wide band communication system suitable to allow the exchange of audio signals, video signals and data among a plurality of users (U1, U2, . . . , Ui), either the same are abutted to a same switching node (NC) or to switching nodes distant among them from the geographical point of view.
Solutions suitable to allow a particularly simple and economic realization of the means for the control of the signalling relevant to the video link, suitable to allow a particularly simple and cheap realization of the switching matrix, as well as to align audio signals to video signals are foreseen (FIG. 2).
80 Citations
7 Claims
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1. In a wide band communication system in which a plurality of users employing work stations are each connected to a switching node via communication lines, the work stations receiving and/or transmitting audio signals, video signals and data, the switching node comprising:
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control means, responsive to signals produced by said work stations on said communication lines, for generating signaling messages identifying the presence of a video signal on a said communication line; coupling means, responsive to said signalling messages generated by said control means, for selectively coupling a communication line to a selected one of a plurality of internodal lines connected to a selected additional switching node, said coupling means selecting a video path within said node between a said communication line and a said internodal line when the presence of a video signal is identified by said control means; and coding means, disposed in said video path, for selectively concentrating or expanding said video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification