Two-bit tri-level forced transition encoding

Details Two-bit tri-level forced transition encoding Two-bit tri-level forced transition encoding

2007-05-23

2009-02-17

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from multi-level codes

C341S068000

Reexamination Certificate

active

07492287

ABSTRACT:
An encoding technique is disclosed for mitigating against the effects of Intersymbol Interference (ISI) and DC creep by forcing data transitions at least every two data bits. Two consecutive bits of data in the original non-return-to-zero (NRZ) data stream are grouped and are converted by an encoding circuit into two new consecutive data bits of the same duration as the original bits. The new encoded bits in each group will necessarily transition between two of three possible data states, and specifically will transition between ‘−1’ and ‘0’ logic states, or ‘+1’ and ‘0’ logic states. Pursuant to this encoding scheme, no more than two consecutive encoded bits will ever be of the same logic state, which prevents any particular data state from predominating and causing DC creep.

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