Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Patent
1995-02-08
1997-12-09
Young, Brian K.
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
341 95, H03M 700
Patent
active
056965052
ABSTRACT:
A a series of m-bit information words is converted to a modulated signal. For each information word from the series, an n-bit code word is delivered. The delivered code words are converted to the modulated signal. The code words are distributed over at least one group of a first type and at least one group of a second type. When a code word belonging to a group of the first type is delivered, its group establishes a coding state of a first type. When a code word belonging to an group of the second type is delivered, a coding state of a second type is established which is determined by the information word which is to be converted to the delivered code word. When one of the code words is assigned to the received information word, this code word is selected from a set of code words which depends on the coding state established. The sets of code words belonging to the coding states of the second type are disjunct. In this coding method, the number of unique bit combinations that may be established by the code words in the series are enlarged.
The modulated signal obtained may be reconverted to information words by first converting the modulated signal to a series of code words and then assigning an information word to each of the code words from the series in dependence on the code word to be converted and also in dependence on the logical values of the bit string bits which are situated at predetermined positions relative to the code word.
REFERENCES:
patent: 4517552 (1985-05-01), Shirota et al.
patent: 4520346 (1985-05-01), Shimada
patent: 4683572 (1987-07-01), Baggen et al.
patent: 4833470 (1989-05-01), Iketani
patent: 4855742 (1989-08-01), Verboom
patent: 5048003 (1991-09-01), Baggen et al.
Jean-Pierre Peguy
U.S. Philips Corporation
Weiss Richard A.
Young Brian K.
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