Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
1995-02-01
1997-12-16
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
341 95, 341 94, H03M 500
Patent
active
056990626
ABSTRACT:
A method and apparatus are described for coding a frame of N-bit bytes into a frame of coded M-bit bytes wherein M>N>0 and wherein said frame has a frame boundary including the steps of storing a frame of M-bit bytes; providing a code containing a set of M-bit bytes which is a subset of all possible M-bit bytes; for each of the 2.sup.N possible N-bit bytes there is a corresponding member in the set; each of the members of the code has a sequence of bits having a binary state selected from one of three values such that if the state of one of the bits is changed, a resulting M-bit byte is not a member of the code; one of the members of the code is a comma used to identify the frame boundary; the comma has a sequence of bits having a binary state selected from a first and second value such that the bit sequence of the comma is confined to one of the members of the code and the bit sequence of the comma does not occur across a boundary between any combination of any other members of the code; assigning to each of said N-bit bytes in the frame the corresponding member from the code to form a coded frame corresponding to the frame; and storing the coded frame.
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Hoff Marc S.
International Business Machines - Corporation
Morris Daniel P.
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