Coding
Set of rules defining a one-one correspondence between information and its representation of characters, symbols or signal components.
Error correcting code
Code which allows, in addition to detection, automatic correction of some faults detected.
Gray code
It is a numeric code unweighted. Its main property is that two successive code words differ only by a bit cell, which avoids the generation of hazards (states Parasites) And take advantage of this adjacency coding to streamline functions.
Called also reflected binary code it is built simply: we copy the code words of departure, preceded by a 0 followed by the words of the same code, taken in reverse order, preceded by a 1.
Example 4 bits:
0 0000
1 0001
2 0011
3 0010
4 0110
5 0111
6 0101
7 0100
Numeric Code unweighted
In these types of code, no weight is assigned to the position a bit. It should be simply a table of correspondences between objects in coding and representation.
Example: Gray code.
Cons-example: binary code.
|
