Robust reception of digital broadcast transmission

摘要

A method and apparatus for improving the reception of digitally modulated signals. A main signal and a supplemental signal are provided in the transmitter. The main signal contains both high priority and low priority data and the supplemental signal contains high priority data. The supplemental signal is advanced in time with respect to the main signal. The main and supplemental signals are sent from the transmitter to the receiver modulated on a signal. At the receiver, the supplemental signal is stored in a buffer. If the main signal is undesirably changed during transmission, corresponding portions of the high priority data of the supplement signal are substituted for the undesired portions of the main signal.