Method of and/or apparatus for encoding and decoding sequential

Details Method of and/or apparatus for encoding and decoding sequential Method of and/or apparatus for encoding and decoding sequential

1984-03-01

1987-06-02

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375114, 371 47, H04L 702

Patent

active

046708901

ABSTRACT:
The specification discloses a method and apparatus for encoding and decoding a variable length augmented code for use in the transmission of sequential information as an indefinite length string of data. Both binary and alternate character code sets are discussed for transmitting and translating information. The variable length code symbols are self synchronizing, and will automatically reestablish synchronization within two characters if a bit or number of bits is lost through noise or faulty transmission. The resynchronization is automatic and occurs by virtue of the construction of the variable length augmented codes. In addition, a method and means of creating a fixed length depleted code for use in digital processors and digital storage media is also disclosed. Inasmuch as most digital processors utilize fixed length words, it is desirable to be able to convert the variable length augmented code into a fixed length depleted code, and to be able to reconvert from the depleted code back to the augmented code without necessity of resorting to an extensive lookup table for each of the characters. In creating the augmented set of self synchronizing variable length code symbols, the original character set C.sup.0 is augmented 9 times until the C.sup.q =2.sup.q(n-1) +1 wherein n represents the number of distinct elements in the original character set C.sup.0 that was augmented, and .vertline.C.sup.q .vertline. is equal to the number of symbols derived in the final augmented set C.sup.q, and is equal to or greater than the desired number of characters to be used in the data handling and communication.

REFERENCES:
patent: 3716851 (1973-02-01), Neumann

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