Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
1995-02-15
1997-06-24
Young, Brian K.
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
H03M 500
Patent
active
056421133
ABSTRACT:
A sequence of m-bit information words is converted to a modulated binary signal. For each received information word from the sequence an n-bit code word is delivered. The delivered code words are converted to the modulated signal. When one of the code words is assigned to an information word to be converted, this code word is selected from a set of code words that depends on a coding state which is related to a digital sum value at the end of the modulated signal that corresponds to the previously delivered code word. From at least one of the digital sum values, a first or a second coding state of a pair of coding states of a first type is determined. Which of the two coding state of the pair is determined depends on the information word that corresponds to the previous delivered code word. The sets of code words belonging to the pairs of coding states of the first type contain no code word whatsoever in common. Because of this, the number of unique bit combinations that can be established by the code words in the sequence is increased.
REFERENCES:
patent: 4387364 (1983-06-01), Shirota
patent: 5136436 (1992-08-01), Kahlman
U.S. Philips Corporation
Weiss Richard A.
Young Brian K.
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