Efficient data-directed scrambler for noise-shaping...

Details Efficient data-directed scrambler for noise-shaping... Efficient data-directed scrambler for noise-shaping...

2007-04-17

2007-04-17

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from packed format

C341S080000

Reexamination Certificate

active

10127903

ABSTRACT:
An efficient data-directed scrambler is provided for processing digital signals having an unequally-weighted code. The data-directed scrambler includes inputs for receiving unequally-weighted bits of an input signal, outputs for supplying N scrambled bits of an output signal, and two or more scrambler columns connected in series between the inputs and the outputs. One or more of the scrambler columns includes a swapper cell and a digital fanout. Least significant bits in the unequally-weighted code are input to a swapper cell, and higher order bits in the unequally-weighted code are input to respective digital fanouts. In the other embodiments, an efficient data-directed scrambler is provided for processing digital signals having an equally-weighted code.

REFERENCES:
patent: 5631649 (1997-05-01), Nakamura
patent: 6137430 (2000-10-01), Lyden et al.
patent: 6326980 (2001-12-01), Worley, III

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