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Combinational Logic Circuits - Technical MCQs

Q1:

Select one of the following statements that best describes the parity method of error detection:

A Parity checking is best suited for detecting single-bit errors in transmitted codes.

B Parity checking is best suited for detecting double-bit errors that occur during the transmission of codes from one location to another.

C Parity checking is not suitable for detecting single-bit errors in transmitted codes.

D Parity checking is capable of detecting and correcting errors in transmitted codes.

ANS:A - Parity checking is best suited for detecting single-bit errors in transmitted codes.

Parity is a bit checker so if Even no.of error occur it won't ditinguish.
EX: Data to b transmitted= 1010101
Even parity of 1010101 is '0' (if odd parity '1')
Let the data transmitted as
1. 1000101 - single bit error; parity is '1'
2. 1001101 - two bits error; parity is '0'

Therefore in 1 (ie single bit error) parity is missmatch

[Parity is calculated by just adding no.of ones; if we follow even parity then over count shd be 0, if not we shd set ie make parity as 1]