gopi
Answered On : Jun 1st, 2005
During transmission, input signals may get affected by noices. parity generator will generate the parity bit for input signals.
They will transmit the input signals along with parity bits. In output side, they will check the parity bit to find out the noice impact on signals.
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prakhar
Answered On : Apr 19th, 2006
parity generation is used for checking whether the data received by transmission is correct or not
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Ramachandran P.R
Answered On : Apr 30th, 2006
First of all understand the question correctly,what is parity generation? not why parity generation?Ans :parity generation is generation of code word according to number of 1's present in that particular word,(example:10001010 for odd:0 or for even:1)
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A parity bit offers a small amount of error checking, to help detect data corruption that might occur during transmission [ can be noise]. [ But its not fully error free]
We can set odd parity or even parity
If Even Parity chosen --> if the number of '1's in the data bits are even then a zero is set in the parity register ex: 1100 0101 ; in this 1's are 4 it is even so 0 is set in parity register
If the number of '1's in the data bits are "odd" then a one is set in the parity register ex: 1001 0001 ; in this 1's are 3 it is odd so 1 is set.
If Odd Parity chosen --> if the number of 1's in the data bits are odd then zero is set
ex: 1101 0110 (has 5 1's so odd) then zero is set in the parity register
If the number of 1's in the data bits are even then one is set
ex: 1101 0111 (has 6 1's so even) then one is set in the parity register
This will give us an idea that the data obtained is not lost, i.e no.of bits. BUT we do not know if the data has been scrambled due to noise so this part we cannot find.
ex: if data is 1111 1010 and @ even parity ==> we get parity bit as 0, so we infer data is true
but if data is 1111 1010 @ even parity ; BUT the data we obtained got changed to 1111 0110 => we still get parity bit as 0, this is an error.
but to some extent this will help us reduce the errors.
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sherina
Answered On : Sep 18th, 2011
Parity bits are extra signals which are added to a data word to enable error checking. There are two types of Parity - even and odd.
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Atul
Answered On : Oct 18th, 2011
In digital communications, an extra bit is sometimes appended to the message to make the logic high bit count even or odd. This extra bit is know as parity bit and used for error detection.
Reference :- http://www.fullchipdesign.com/parity_generation_checking.htm
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