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In differential encoding the _________ different between two wave forms is measured.

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In differential encoding the _________ different between two wave forms is measured.

(a) Magnitude

(b) Frequency

(c) Phase

(d) Time period

This question was addressed to me in an internship interview.

My query is from Coherent Detection topic in division Bandpass Modulation and Detection of Digital Communications

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The correct answer is (c) Phase

The explanation is: In differential encoding, the phase of the present signal waveform is compared with the phase of the previous signal.

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