Simultaneous transmission system for digital data and television - uses time compression of colour and brightness components prior to multiplexing

摘要

The simultaneous transmission system for digital data and television signals uses line by line sampling of the successive television images. A synchronisation signal and a black level signal are transmitted during the line changing intervals, with multiplexing of the time compressed colour and brightness components outside the line changing intervals. The brightness component is compressed by a factor of at least two thirdse and the colour component is compressed by a factor of more than 3, so that the whole line is not filled, the remainder used for a digital data salve. Pref. the colour component is compressed by a factor of 6. USE - For high quality satellite transmissions.