**NETWORK COMPUTER PEOPLE** {i need your help} - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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SteveW

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Registered: 15th Jul 02
Location: Up in the clouds
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24th Nov 03 at 21:13

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

PaulW

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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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24th Nov 03 at 21:18

duno if this is any use or not

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

Cole

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Registered: 11th Nov 02
Location: eastbourne Drives:zafira sold now a qashqai
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24th Nov 03 at 21:20

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

SteveW

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Registered: 15th Jul 02
Location: Up in the clouds
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24th Nov 03 at 21:21

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

Thanx for trying tho

willay

Moderator
Organiser: South East, National Events
Premium Member

Registered: 10th Nov 02
Location: Roydon, Essex
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24th Nov 03 at 21:34

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,

SteveW

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Registered: 15th Jul 02
Location: Up in the clouds
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24th Nov 03 at 21:37

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

argh...

Tim

Site Administrator

Registered: 21st Apr 00
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24th Nov 03 at 21:54

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)...

Steve

Premium Member

Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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24th Nov 03 at 21:55

tim i dont think you know what your on about

SteveW

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Registered: 15th Jul 02
Location: Up in the clouds
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24th Nov 03 at 22:01

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

Tim

Site Administrator

Registered: 21st Apr 00
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24th Nov 03 at 22:05

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

SteveW

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Registered: 15th Jul 02
Location: Up in the clouds
User status: Offline

24th Nov 03 at 22:13

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.

SteveW

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Registered: 15th Jul 02
Location: Up in the clouds
User status: Offline

24th Nov 03 at 22:15

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.

willay

Moderator
Organiser: South East, National Events
Premium Member

Registered: 10th Nov 02
Location: Roydon, Essex
User status: Offline

24th Nov 03 at 22:16

binary gives you cancer - FACT.

Ian

Site Administrator