Arrangement for the transmission of digital television signals

H - Electricity – 04 – N

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350/41

H04N 9/04 (2006.01) H04N 9/64 (2006.01)

Patent

CA 2005335

PHD 88 261 10-5-1989 ABSTRACT: Arrangement for the transmission of digital television signals. In an arrangement for transmitting digital television signals from a plurality of signal sources to at least one signal sink an interconnection of several video signal sources which are of a simple structure and simple to operate and can be used universally and reliably for different operating modes is enabled by - a picture signal line group (7) for the transmission of luminance and color signals encoded as digital picture data from always one optional signal source of the signal sources (1, 2, 3, 4), - a synchronizing signal line group (8) for the transmission of a picture data clock signal and a line synchronizing signal from a clock signal source (45) - and also an access-control (9) having for each signal source (1, 2, 3, 4) an access-control circuit (13, 23, 33, 43) which supplies an inhibit signal from an output (15, 25, 35, 45) when an inhibit signal is applied to an input (14, 24, 34, 44) or when a signal from the associated signal source (1, 2, 3, 4) is available there for transmission and which when an inhibit signal is present at its input (14, 24, 34, 44) inhibits the associated signal source (1, 2, 3, 4) for the supply of digital picture data in a predetermined temporal correlation with the picture data clock signal and enables it in like manner after the inhibiting signal has disappeared, all the access-control circuits (13, 23, 33, 43) having their inputs (14, 24, 34, 44) and their outputs (15, 25, 35, 45) incorporated in a chain circuit which determines the priority of the signal sources (1, 2, 3, 4) for the transmission. Figure.

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