Synchronising digital signals

摘要

Data transmission apparatus for transmitting a digital signal as a bitstream of successive data bits organised as a plurality of data channels comprises: means for transmitting portions of data from each of the plurality of data channels in a cyclic sequence of data channels; means,(Fig 7 not shown) generating a pseudorandom synchronisation signal; and means 10 for transmitting data portions of the pseudorandom synchronisation at positions in the transmitted bit stream separated by predetermined intervals and having a predetermined displacement with respect to data portions from the plurality of data channels.