Data processing apparatus

Details Data processing apparatus Data processing apparatus

1986-11-17

1989-05-23

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 55, 341 58, 341 63, 341 95, 341106, H03M 740

Patent

active

048334715

ABSTRACT:
There is provided a data processing apparatus for encoding or decoding binary data such as a magnetic disk or an optical disk in which a binary data sequence is converted to a binary code sequence which is suitable for a data processes. This data processing apparatus comprises: a code converter for converting the m-bit data in the binary data sequence to the n-bit code corresponding thereto; output means for outputting the n-bit code sequence corresponding to the binary data sequence; and DC-freeing means for restricting the DC component of the code sequence which is outputted from the output means. The code converter has a ROM table to store the data for code conversion and a register for converting the m-bit serial data to the parallel data and can be easily constituted by a programmable array logic.

REFERENCES:
patent: 4337458 (1982-06-01), Cohn
patent: 4387364 (1983-06-01), Shirota
patent: 4499454 (1985-02-01), Shimada
patent: 4520346 (1985-03-01), Shimada
patent: 4523181 (1985-06-01), Tazaki
patent: 4577180 (1986-03-01), Fukuda
patent: 4617552 (1986-10-01), Kojima et al.

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