Aiken code
The Aiken code is a complementary binary-coded decimal code . A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table . The code was developed by Howard Hathaway Aiken and is still used today in digital clocks , pocket calculators and similar devices.
The Aiken code differs from the BCD code in that the Aiken code does not weight the 4th digit as 8 with the BCD code but with 2.
The following weighting is obtained for the Aiken code: 2-4-2-1
One might think that double codes are possible for a number, For example 1011 and 0101 could represent 5. However, here one makes sure that the digits 0 to 4 are mirror image complementary to the numbers 5 to 9.
| Example of Aiken code | ||||
|---|---|---|---|---|
| Decimal- digit |
Aiken- code |
BCD- code | ||
| 0 | 0 0 0 0 | 0 0 0 0 | ||
| 1 | 0 0 0 1 | 0 0 0 1 | ||
| 2 | 0 0 1 0 | 0 0 1 0 | ||
| 3 | 0 0 1 1 | 0 0 1 1 | ||
| 4 | 0 1 0 0 | 0 1 0 0 | ||
| 5 | 1 0 1 1 | 0 1 0 1 | ||
| 6 | 1 1 0 0 | 0 1 1 0 | ||
| 7 | 1 1 0 1 | 0 1 1 1 | ||
| 8 | 1 1 1 0 | 1 0 0 0 | ||
| 9 | 1 1 1 1 | 1 0 0 1 | ||
See also
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