US Patent 7685498 Digital broadcasting system and digital broadcast transmission and reception method

A digital broadcasting system transmitting and receiving a broadcast stream created from a broadcast source. The system includes a hierarchical coding unit (2) coding the broadcast source depending on a characteristic of the broadcast source and generating, from the coded broadcast source, a first layer code and a second layer code which can respectively be used for reproduction of the broadcast source and includes a synthesis unit (5) generating data bursts, each including the generated first and second layer code. The system also includes a multiplexing unit (7) creating the broadcast stream by multiplexing the generated data bursts, a transmission unit (9) transmitting the created broadcast stream to the network, a tuning/demodulation unit (301) receiving the transmitted broadcast stream, a synchronization unit (302) extracting, from the received broadcast stream, at least one of the first layer code and the second layer codes and a TS decoder (303) reproducing the broadcast source using the extracted code.