Method of secondary modulation of a train of recorded data

Details Method of secondary modulation of a train of recorded data Method of secondary modulation of a train of recorded data

1993-02-11

1994-07-05

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

341 68, 341 52, H03M 500

Patent

active

053271246

ABSTRACT:
A secondary modulation method which replaces any bit excluding the leading bit of consecutive five or more ones in an odd-numbered bit pattern of a train of RLL-modulated data, with a zero to provide a modulated bit pattern having no consecutive zeros. It is therefore possible to form marks of a given width on a disk without any mark edge shift, thus preventing the level of the waveform of a signal read from a disk from falling below the slice level at the position where the waveform of the read signal should show "1". This can ensure the proper data reproduction.

REFERENCES:
patent: 4413251 (1983-11-01), Adler et al.
patent: 4617552 (1986-10-01), Kojima et al.
patent: 4626826 (1986-12-01), Fukuda et al.
patent: 5012240 (1991-04-01), Takahashi et al.
patent: 5047767 (1991-09-01), Weathers et al.
patent: 5200979 (1993-04-01), Harris

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