Data scrambler

Details Data scrambler Data scrambler

1965-08-25

1981-12-08

Birmiel, Howard A.

Telegraphy

Systems

Printing

178 2214, 178 2219, H04L 900

Patent

active

043049621

ABSTRACT:
Binary digital data signal patterns containing either no transitions, periodically recurring transitions or both are randomized by constructing a key signal from a summation of selected stored digits of the data pattern and combining such key signal with the data signal to form a scrambled line signal for transmission. The line signal so constructed is free of signal energy concentrated at particular frequencies and provides signal transitions adequate in number to assure reliable recovery of synchronization information. Descrambling of the received line signal is accomplished by precisely the inverse of the scrambling operation. The system is self-synchronizing because the key signals constructed by each of the scrambler and descrambler are derived from the same line signal.

REFERENCES:
patent: 3162837 (1964-12-01), Meggitt
patent: 3421146 (1969-01-01), Zegers
patent: 4187392 (1980-02-01), Safford
Golomb et al., "On the Factorization of Trinomials Over GF(2)", Memorandum No. 20-189, Jet Propulsion Lab., Jul. 1959, Pasadena.
Peterson, Error Correcting Codes, 1961, MIT Press, Chapters 7, 8 and 12.
Golomb et al., Digital Communications with Space Applications, 1964, Prentice-Hall, Ch. 1 & 2 & Appendix 3.
Huffman, "The Synthesis of Linear Sequential Coding Networks", Linear Sequential Switching Circuits, Selected Technical Papers, Holden-Day, 1965, pp. 1-19.

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