Data coding for fast start-up of PRML receivers

Details Data coding for fast start-up of PRML receivers Data coding for fast start-up of PRML receivers

1990-08-10

1993-08-31

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 95, 341102, H03M 514, H03M 700, H03M 746

Patent

active

052413098

ABSTRACT:
In recording systems using partial-response maximum-likelihood detection (PRML) techniques, data sequences are preceded by a preamble consisting of all ones. Coding schemes are disclosed which allow to keep the number of consecutive ones occurring in the coded data sequences at a minimum, while simultaneously restricting the number of consecutive zeros in full and partial data sequences to a low value which is important for improving receiver operation. The disclosed coding schemes and apparatus enable a faster and more reliable discrimination between timing preambles and data sequences, thus allowing to use shorter timing preambles which results in faster receiver start-up and in a reduction of storage overhead for the preambles.

REFERENCES:
patent: 4617552 (1986-10-01), Kojima et al.
patent: 4644564 (1987-02-01), Dolivo et al.
patent: 4707681 (1987-11-01), Eggenberger et al.
patent: 4786890 (1988-11-01), Marcus et al.
patent: 4870414 (1989-09-01), Karabed et al.
patent: 4890299 (1989-12-01), Dolivo et al.
patent: 5001482 (1991-03-01), Chung et al.
patent: 5040191 (1991-08-01), Forney, Jr. et al.
IBM Technical Disclosure Bulletin, Jan. 31, 1989, No. 8, Armonk, NY, "Rate 16/17 (0,6/6) Code", pp. 21-23.
IBM Technical Disclosure Bulletin, vol. 28, No. 3, Aug. 1985, pp. 1048-1051. "Run Length Restriction On The Output of PR4 Channels".

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