Coded data generation or conversion – Digital code to digital code converters
Patent
1997-08-25
1999-06-22
Williams, Howard L.
Coded data generation or conversion
Digital code to digital code converters
341 50, H03M 700
Patent
active
059146788
ABSTRACT:
A triplet decoding method capable of decoding operation in a short time is provide, in which a triplet data Y is defined as Y=9M1+3M2+M3. A first decimal value -9 is subtracted from a decimal value Y to generate a first subtraction result. A second decimal value -18 is subtracted from the value of Y to generate a second subtraction result. A third decimal value -27 is subtracted from Y to generate a third subtraction result. Then, whether each of the first, second, and third subtraction results has a negative polarity is judged to know M1. A provisional triplet data Y' is calculated by subtracting 9M1 from Y. Further, the first value -9 is subtracted from a value of Y' to generate a fourth subtraction result. The second value -18 is subtracted from the value of Y' to generate a fifth subtraction result. The third value -27 is subtracted from the value of Y' to generate a sixth subtraction result. Then, whether each of the fourth, fifth, and sixth subtraction results has a negative polarity or not is judged to know the second decimal number M2. The third decimal number M3 is calculated by substracting a value of 3M2 from the value of the provisional triplet data Y'.
REFERENCES:
patent: 3956578 (1976-05-01), de Loye et al.
NEC Corporation
Williams Howard L.
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