A parity bit is one of the most

common ways to achive

error detection when

binary information is

transmitted from one location to

another location. If an

error occur, and one of the bits

change from 0 to 1 or

vice versa. An extra pit is included with the message to make the total number of 1's transmitted either

odd or

even. If an odd parity is adopted, the parity bit is chosen such that the total number of 1's is odd. If an even parity is adopted, the parity bit is chosen such as the total number of 1's is even.

Example:

Odd Parity: (NBCD)

0000 1

0001 0

0011 1

0100 0

0101 1

0110 1

0111 0

1000 0

1001 1

Even Parity (NBCD)

0000 0

0001 1

0011 0

0100 1

0101 0

0110 0

0111 1

1000 1

1001 0