Teletext data change detection and noiseless data compression

Full Channel teletext system is a high speed data broadcasting system. Pages of information are broadcast in a cyclic mariner. The detection of data change in the information pages is necessary for data analysis, database update and retransmission. Lossless data compression is also necessary to enhance the data throughput in rebroadcasting and to reduce the storage requirement. Performing data change detection and data compression in real time using a software approach in a small machine is impossible for such high speed data. In this paper, we describe the algorithms that are suitable for hardware implementation for both data change detection and noiseless data compression. © 1995 IEEE