A special system of multiple parity bits (e.g. Hamming parity) that allows not only error detection but limited error correction.
Parity
ECC error correction code because 98% of errors are single bit
A single bit error is when only one bit within a given data string is in error. It affects only one character within a message
The major drawback of the single bit parity check method for error detection is its inability to detect errors when an even number of bits are flipped. For example, if two bits in a data unit change, the parity may still appear correct, leading to undetected errors. Additionally, it can only indicate whether an error has occurred, not the location or nature of the error, limiting its effectiveness in error correction.
The weakness of a parity bit is that it can only detect single-bit errors, meaning if two bits are flipped, the parity will remain unchanged, leading to undetected errors. Additionally, it provides no information about which bit is erroneous, making it less effective for error correction. This limitation makes parity insufficient for systems requiring higher reliability and error detection capabilities.
Error-Correcting Code or EEC
Kermit was (is) a protocol for transferring data between computers via a 7-bit serial link. It has good error correction. It was named after the Jim Henson Muppet creation Kermit the Frog.
ECC (error correction code) memory can detect 2 bit errors (per 64 bits) but can only correct 1 bit errors (per 64 bits)
Hamming code has several disadvantages, including limited error correction capability, as it can only correct single-bit errors and detect two-bit errors. Its efficiency decreases with increased data size, leading to a higher overhead due to the added parity bits. Additionally, Hamming code requires precise synchronization, making it less effective in environments with variable latency or noise. Finally, it may not be suitable for applications requiring correction of multi-bit errors, necessitating more robust error-correcting codes.
channel encoder inserts additional information to the transmitted bit stream to facilitate error detection and correction at the receiver. channel decoder is quite opposite to the channel encoder which transmits desired data after the error detection and correction .
In computing, parity refers to a method of error detection used in data transmission and storage. It involves adding an extra bit, known as the parity bit, to a binary number to indicate whether the number of 1s is odd or even. This allows systems to detect single-bit errors; for example, in even parity, if the number of 1s is odd, the parity bit is set to 1 to make it even. While useful for basic error checking, parity cannot correct errors and is often used alongside more robust error detection and correction methods.
The term single bit error suggest that only one bit in the given data unit sush as byte is in error.this means that only one bit will change from 1 to 0 or 0 to 1.. In case of burst error,if two or more bits from a data unit such as bte change from 1 to 0 or from 0 to 1 then burst errors are said to have occured.the lenghth of burst is measured from the first corrupted bit to last corrupted bit