EMI suppression coding

Details EMI suppression coding EMI suppression coding

1992-10-21

1994-02-01

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 380 46, 380 49, H04L 2730

Patent

active

052838072

ABSTRACT:
EMI suppression technique that pseudorandomizes the positive or negative going transitions that are used to represent one binary state in a transmitted digital signal such as in an MTL-3 data format. By pseudorandomizing the selection of these transitions, substantial spreading of the spectral energy occurs. Descrambling need not occur since each transition is recognized as the encoded binary state. Thus, the data sender can encode the data and suppress EMI without any changes to the receiver's equipment.

REFERENCES:
patent: 3409831 (1968-11-01), Walker
patent: 3984624 (1976-10-01), Waggener
patent: 4231113 (1980-10-01), Blasbalg
patent: 4329711 (1982-05-01), Cheung
patent: 4438519 (1984-03-01), Bose
patent: 4468792 (1984-08-01), Baker et al.
patent: 4607375 (1986-08-01), Lee
Digital Transmission Systems, David R. Smith, published by Van Nostrand Reinhold Company, New York (1985).

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