Method and apparatus for implementing a set rate code for data c

Details Method and apparatus for implementing a set rate code for data c Method and apparatus for implementing a set rate code for data c

1997-02-03

1998-07-21

Elms, Richard T.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341 59, H03M 700

Patent

active

057840105

ABSTRACT:
A data encoding method and apparatus are provided for implementing a predefined rate code, such as a 16/17 rate code for a data detection channel in a direct access storage device. A binary data stream is received and sequential symbols of the received binary data stream are identified. Sequential alternate symbols of the binary data stream are encoded into first codewords. Sequential alternate other symbols are encoded into second codewords. The alternating first and second codewords are sequentially combined. For a rate 16/17 rate code, the first codewords include 9-bit codewords and the second codewords include 8-bit codewords. The second 8-bit codewords are either raw symbols of the received binary data stream or remapped symbols of the received binary data stream. All likely error events are limited to within three consecutive bytes in a user data stream with a 16/17 rate code of the preferred embodiment.

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