Data compression system with expansion protection

Details Data compression system with expansion protection Data compression system with expansion protection

1987-10-19

1989-09-26

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

With error detection or correction

341 51, 364900, 3649263, H03M 730

Patent

active

048704156

ABSTRACT:
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. 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 is inserted in 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.

REFERENCES:
patent: 4145686 (1979-03-01), McMurray et al.
patent: 4486784 (1984-12-01), Abraham et al.
patent: 4654877 (1987-03-01), Shimoni et al.
patent: 4719514 (1988-01-01), Kurahayashi et al.
patent: 4772955 (1988-09-01), Kurahayashi et al.

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