true though!

very old ian :P

There are 10 types of people in this world, those who understand binary and those who do not.

binary gives you cancer - FACT.

Give a written description and Venn diagrams to explain hom an eighth-bit could be used to provide both a SEC (Single Error Correction) and DED (Double Error Detection) code for the Hamming coded 4-bit data word.

sorry for not being clear.

I need it in english not in code ;)

here is waht i have found so far.

The reliability of computer storage and computations are an essential part of why they have become ubiquitous. A commonly used method to check on the accuracy of memory is to store an extra parity bit.

The extra parity bit can be used to detect (but not correct) single bit errors in a byte.

There are two conventions. In even parity, it is always the case that the total number of 1 bits is even - if necessary by setting the parity bit to be 1. In odd parity, it is always the case that the total number of 1 bits is odd.

Which is better? Neither - they are equally good but unfortunately unstandardized conventions.

Sometimes we need more than detecting errors. By adding extra parity bits, we can correct single-bit and even larger errors. For example, CD-ROMS use very sophisticated error-correcting mechanisms to compensate for scratches.

Parity also becomes an issue with transmitting data from one computer to another via a modem. It is important that both computers agree on whether to use even, odd, or no parity so the bits can be received properly.

I've just explained how it works for a 4 bit word... :boggle:

Tim - i dont need the actual code itself (thanx anyway) all i need to know is how the 8th bit works for the hamming coded 4bit data word :D

tim i dont think you know what your on about

By changing from 3 check bits to 4 check bits, you increase the Hamming distance (d) from 3 to 4 (2^d = gap between valid codes)...

When you use for both detection AND correction, d = t (correct) + s (detect) + 1... So the 8th bit enables you to either do TED (d = 0 + 3 + 1)

or

DED AND SEC (d = 1 + 2 + 1)...

yeah mate it is the extra parity bit. But i need to know HOW ITS USED etc...

argh...

snowy you doing binary? looks like it i think? I've done it like twice now and still doesnt stick cause its so borring, wasnt it something about an extra bit used for error correction? or 'parity bit' ? argh i dunno, :)

cheers mate, BUT i have pretty much all that info anyway.

Thanx for trying tho :thumbs:

i could always ask the bloke who is being tried at the court im sitting on the jury for he stole loads of network parts from his employer and i'll tell him i 'll say not guilty lol

duno if this is any use or not

http://cnx.rice.edu/content/m0097/latest/

OK hiya i cant find anything that will explain this too me :( i have tries google and whatis.com

HELP ME PLEASE...

Part 2
B)

Give a written description and Venn diagrams to explain hom an eighth-bit could be used to provide both a SEC (Single Error Correction) and DED (Double Error Detection) code for the Hamming coded 4-bit data word.

HELP ME PRETTY PLEASE...

Steve :wave: