8/9 Coding apparatus and method of same

Details 8/9 Coding apparatus and method of same 8/9 Coding apparatus and method of same

1997-07-01

1999-02-09

Young, Brian

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

341 58, H03M 700

Patent

active

058700404

ABSTRACT:
An 8/9 coding apparatus which suppresses the DC component of input data to be recorded on a magnetic tape by converting the 8-bit input data to 9-bit coded data, provided with a CDSc table for the CDSc data, that is, the data of the complement of 2 of the cumulative value of bits in a symbol included in coded data based on the input data. In a DSVc adder, CDSc data is cumulatively added by a polarity in accordance with polarity data, DSVc data indicating the complement of 2 of the cumulative value of the bits for every sector is generated, and an MSB bit thereof is output as MSB data to a table selector. The table selector outputs a table switching signal generated based on the polarity data and the MSB data to a data table, a polarity table, and the CDSc table. The tables are selectively used based on this switching signal.

REFERENCES:
patent: 4775985 (1988-10-01), Busby

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