REDUNDANT TRANSMISSION OF PROGRAMMES

摘要

A compression system 110 compresses a programme into a first and second sequence of corresponding blocks. A transmission system 120 transmits blocks of the second sequence according to a predetermined real-time delivery schedule. The transmission system transmits the blocks of the first sequence earlier than corresponding blocks of the second sequence. A receiver 135 receives blocks of the second sequence and the first sequence. A buffer 140 temporarily stores blocks of the first sequence that correspond to blocks of the second sequence for which the delivery schedule has not yet expired. A controller 160 directs to the output 155 for each time interval of the delivery schedule a representation of a block of the second sequence if such a block was received successfully for the time interval or, otherwise, a representation of a corresponding block stored in the buffer.