| 摘要 |
A data compression system implementing expansion protection employs one or more pairs of FIFOs to compare the lengths of raw and processed versions of a block of received data. A data compression system includes a data compressor (11), a controller (19), a FIFO (13) for compressed data, and another FIFO (15) for uncompressed data. The FIFOs (13 and 15) are used to compare the length of a data block processed by the data compressor (11) with the raw version of the data block. The shorter version is transmitted so that the data transmitted by the data compression system is at most negligibly expanded relative to the system input. A code injector (17) inserts a code into the output stream to indicate the beginning of the transmission of a raw data block so that a receiving or retrieving system can determine whether the data following needs to be decompressed or not. Further codes can be injected to indicate a switch from raw data to processed data in the output of the compression system. |
