Modulation code encoder and/or decoder

Details Modulation code encoder and/or decoder Modulation code encoder and/or decoder

1996-07-19

1998-06-16

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 95, H03M 700

Patent

active

057677980

ABSTRACT:
Modulation code encoder/decoder for a (2,9) RLL modulation code are provided. The modulation code encoder includes a serial-to-parallel converter, a controller, an inverter, a first and second memory and a multiplexer, and the modulation code decoder includes a serial-to-parallel converter, a controller, an inverter, a first and second memory, a first multiplexer, a delay circuit, a selection signal output portion, a second multiplexer and a parallel-to-serial converter. The modulation code encoder/decoder can be applied to a magneto-optical disk, magnetic tape and hard disk drive (HDD) in which high-density recording is required since the error correction capacity is enhanced by providing a decoder which performs an overlapped decoding operation with respect to the (2,9) RLL modulation code.

REFERENCES:
patent: 4413251 (1983-11-01), Adler et al.
patent: 4672362 (1987-06-01), Furukawa et al.
patent: 5184215 (1993-02-01), Weng
patent: 5400023 (1995-03-01), Ino et al.
patent: 5486828 (1996-01-01), Mikami
patent: 5579003 (1996-11-01), Hirayama et al.

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