US PATENT SUBCLASS 714 / 752
.~ Forward correction by block code

Current as of: June, 1999
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714 /   HD   ERROR DETECTION/CORRECTION AND FAULT DETECTION/RECOVERY

746  DF  DIGITAL DATA ERROR CORRECTION {5}
752.~ Forward correction by block code {18}
753  DF  .~.~> Double error correcting with single error correcting code
754  DF  .~.~> Error correction during refresh cycle
755  DF  .~.~> Double encoding codes (e.g., product, concatenated) {1}
757  DF  .~.~> Parallel generation of check bits
758  DF  .~.~> Error correcting code with additional error detection code (e.g, cyclic redundancy character, parity)
759  DF  .~.~> Look-up table encoding or decoding
760  DF  .~.~> Threshold decoding (e.g., majority logic)
761  DF  .~.~> Random and burst error correction
762  DF  .~.~> Burst error correction
763  DF  .~.~> Memory access {8}
774  DF  .~.~> Adaptive error-correcting capability
775  DF  .~.~> Synchronization
776  DF  .~.~> For packet or frame multiplexed data
777  DF  .~.~> Hamming code
778  DF  .~.~> Nonbinary data (e.g., ternary)
779  DF  .~.~> Variable length data
780  DF  .~.~> Using symbol reliability information (e.g., soft decision)
781  DF  .~.~> Code based on generator polynomial {4}

DEFINITION

Classification: 714/752

Forward correction by block code:

(under subclass 746) Subject matter in which a grouping of symbols (i.e., a block of data or a data word) is transformed

into a code word having an increased number of symbols in order to provide an increased minimum distance between code words relative to the minimum distance of the corresponding data words in order to provide for forward correction of the encoded data in the event that an error or erasure is subsequently imposed on the encoded data.

(1) Note. This subclass includes both forward error correction, per se, (i.e., the receiver corrects the error without requiring any further information from the sender, which requires a minimum amount of redundancy in the transmission since not only must an error be detected, but its location must be determined) and forward error correction with the assistance of symbol reliability information.

(2) Note. Forward error correction (FEC) is an error-correcting technique that avoids the need for any reverse channel by enabling self-correction of errors at the receiver by adding information (at the expense of throughput) to enable the receiver to determine what the error was and the correct information to substitute for said error.

SEE OR SEARCH THIS CLASS, SUBCLASS:

786, for convolutional codes in which each check bit is generated as a function of a different plurality of information bits and is interspersed among the information bits at predetermined intervals with no natural beginning point or ending point.