parity check
Học thuậtThân thiện
Definition
Noun: A method for verifying the integrity of data, especially during transmission or storage in a computer system. It involves adding an extra bit (the parity bit) to a set of binary data to make the total number of 1-bits either always even (even parity) or always odd (odd parity). The system checks this count to detect errors.
Usage
A parity check is a fundamental error-detection technique. It is used to ensure data has not been corrupted. The system performs a parity check by counting the bits in a received data unit and comparing the count to the expected parity (even or odd).
Examples
- The simple communication protocol used a parity check on each byte of data.
- After the data transfer, the receiver performed a parity check and found an error in the third packet.
- The memory module's reliability was increased by using a parity check for every write operation.
Advanced Usage
- Longitudinal parity check (LRC): A more advanced form where a parity bit is calculated for each bit position across a block of bytes, creating a parity byte for the entire block.
- While effective for detecting single-bit errors, a simple parity check cannot correct errors and may fail to detect errors involving an even number of changed bits.
Variants and Related Words
- Parity Bit (n): The extra bit added to data to make the parity (even or odd) correct.
- The system appended a parity bit to each 7-bit character before transmission.
- Parity Error (n): An error that is identified when a parity check fails.
- The console displayed a "parity error" message, indicating corrupted data.
Synonyms
- Redundancy check: A broader term for any error-detection method that adds extra (redundant) data.
- Error-checking: The general process of detecting errors in data.
Related Phrases
- To run a parity check: To execute the parity verification process.
- The technician decided to run a parity check on the entire hard disk.
- To fail a parity check: To be identified as containing an error by the parity verification process.
- The data packet failed the parity check and was automatically retransmitted.
Noun
- a system of checking for errors in computer functioning