Channel encoder

Details Channel encoder Channel encoder

1987-06-15

1988-10-18

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

360 40, 371 55, 371 56, H03M 714

Patent

active

047790725

ABSTRACT:
On the basis of n-bit words presented, the described channel encoder generates DC-free and run length limited m-bit (m>n) code words having (1+D).sup.-1 or (1+D.sup.1).sup.-1 precoder properties. The m-bit code words are formed each time by appending (m-n) bits to the n-bit words presented. For the determination of the (m-n) bits to be added, the amplitude density function as well as the distribution of the run length and the digital sum variation of the code words is calculated.

REFERENCES:
patent: 4499454 (1985-02-01), Shimada
patent: 4598267 (1986-07-01), Fukuda

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