Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
1994-10-25
1997-02-11
Young, Brian K.
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
360 40, G11B 509
Patent
active
056025475
ABSTRACT:
A data conversion apparatus which converts an m-bit data into plural n-bit codes having different CDS values to obtain an intense spectrum at frequencies with a period of p bits has a CDS control signal generator which generates data of a known CDS in codeword with one period which is the least common multiple (q) of n and p, an error detector which detects differences between values of charge in codeword at intervals of (r) bits (where r is the greatest common divisor of n and p) and the data of the known CDS in codeword and detects a sum of absolute values (.DELTA.CDS) of the differences, and a minimum value hold circuit which selects a code having the smallest sum of absolute values (.DELTA.CDS), from the plural n-bit codes having different CDS values.
REFERENCES:
patent: 5196848 (1993-03-01), Sakazaki
patent: 5365232 (1994-11-01), Ido et al.
patent: 5432651 (1995-07-01), Maeno
Ido Kihei
Kosaka Hideaki
Maeno Kenji
Jean-Pierre Peguy
Mitsubishi Denki & Kabushiki Kaisha
Young Brian K.
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