Signal modulation method employing multilevel run length limit c

Details Signal modulation method employing multilevel run length limit c Signal modulation method employing multilevel run length limit c

1997-07-22

1999-04-06

Young, Brian

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 58, H03M 700

Patent

active

058924671

ABSTRACT:
A signal modulation method used for a digital channel of digital recording media and digital communication. The method includes the steps of (a) receiving data in a first data unit of a first bit length and RLL encoding the received data into a (d,k) code word; and (b) receiving data in a second data unit of a second bit length and RLL encoding the received data if a number of consecutive zeroes is less than d when two codes words encoded in said step (a) are concatenated. Therefore, a higher resolution than that of other modulation codes is achieved, for a minimum time interval, 4T (diffraction limit). The DC component of a modulated code can be suppressed by controlling merging bits.

REFERENCES:
patent: 4760378 (1988-07-01), Iketani et al.
patent: 5400023 (1995-03-01), Ino et al.
patent: 5532694 (1996-07-01), Mayers et al.
patent: 5537112 (1996-07-01), Tsang
patent: 5781133 (1998-07-01), Tsang

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