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Which error detection method consists of just one redundant bit per data unit?

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Which error detection method consists of just one redundant bit per data unit?

(a) Simple parity check

(b) Two-dimensional parity check

(c) CRC

(d) Checksum

The question was asked in examination.

Origin of the question is Parity Generators/Checkers topic in chapter Combinational Circuits of Digital Circuits

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Right answer is (a) Simple parity check

Explanation: A parity checker is an error detection method used for the purpose of detecting errors that may have been incorporated during transmission. Simple parity check method consists of just one redundant bit per data unit. It is again classified as even parity and odd parity.

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