Patent ID: 6067381
Filing Date: 2000-05-23
Classification: H03M

Abstract:
A method of reinitializing dictionaries in a data transmission system using data compression, said system comprising a transmit device and a receive device and wherein strings of characters have to be transmitted in a compressed form from said transmit device to said receive device, said transmit device having a transmit dictionary storing codewords associated with said strings of characters which are transmitted instead of said strings of characters from said transmit device to said receive device, said receive device having a receive dictionary storing codewords associated with said strings of characters, and said transmit and receive dictionaries being updated each time a new string of characters has to be transmitted so that the contents of both dictionaries remain identical;said method comprising the following steps:(a) saving at least the addresses of the parts of said transmit or receive dictionary which have to be modified by a dictionary updating operation;(b) building a CRC check message based upon the contents of said transmit dictionary updated by said dictionary updating operation, and transmitting it from said transmit device to said receive device; and(c) deleting in said transmit and receive dictionaries the parts which are determined by said saved addresses in case said CRC check message does not correspond to the contents of the updated receive dictionary, whereby both transmit and receive dictionaries are reinitialized in an intermediate state without being reset.