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Which waveform has the feature of error detection?

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Which waveform has the feature of error detection?

(a) NRZ-L

(b) RZ-AMI

(c) Manchester coding

(d) Duobinary

The question was asked in exam.

I need to ask this question from Baseband Transmission-2 topic in division Formatting and Baseband Modulation of Digital Communications

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Correct option is (d) Duobinary

Explanation: Duobinary scheme does error detection without introducing any additional error bits into the data sequence.

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