Data scrambler and descrambler capable of preventing continuous

Details Data scrambler and descrambler capable of preventing continuous Data scrambler and descrambler capable of preventing continuous

1991-11-01

1993-01-12

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

380 2, 380 42, H04K 100

Patent

active

051795922

ABSTRACT:
A data scrambler, which transmits a data sequence, includes circuitry to suppress consecutive occurrences of a predetermined number of data sequence bits having the same value. The number of consecutive occurrences of bits having the same value are counted. When the number of consecutive occurrences of bits having the same value reaches a predetermined number, at least one of the bits of the transmitted data sequence is inverted. Complementary circuitry is included in a data descrambler so that the bits that were inverted by the data scrambler can be re-inverted to their original value by the descrambler.

REFERENCES:
patent: 4109856 (1978-08-01), Van Beveren et al.
patent: 4519083 (1985-05-01), Hanson
patent: 4802220 (1989-01-01), Marker, Jr.

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