Device for real-time correction of errors in data recorded on a magnetic medium
AssigneeThomson-CSF
InventorTristan de Couasnon
Life of this patent
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Abstract
The error-correcting device for processing data in parallel on a plurality of tracks provides two levels of correction on the basis of redundancy bits added to the transmitted data, namely bits resulting from coding in blocks of serial data on each channel by means of a shortened Fire code (200, 180), and parity bits each relating to one-half of the parallel tracks. An array of decoders delivers the data corrected on the basis of the bits resulting from the Fire code which are substituted when necessary for the data stored in a memory. When the errors in a block of one of the tracks are too long to be corrected in this manner, two parity computers associated with multiplexers permit determination of the erroneous bits.
Claims7
A device for encoding data to provide redundancy bits and parity bits on data recorded on a multitrack medium comprising:
- means for processing data in the form of a sequence of data by dividing said sequence into a plurality of parallel data blocks each to be recorded on a track of said medium and each bit of said blocks having a corresponding parallel bit on the other tracks;
- first means for coding on at least one of said tracks a sequence of parity bits in sequential blocks produced by operation on the corresponding parallel bits to be recorded on tracks as blocks;
- and
- second means for coding each of data blocks and said blocks of parity bits with a plurality of n serial redundancy bits in the form of the shortened Fire code type in each block of N serial bits.
Dependencies are inferred from the claim text.