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In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?

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In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?

(a) Unipolar RZ

(b) Bipolar RZ

(c) RZ-AMI

(d) Manchester coding

I had been asked this question in final exam.

I'd like to ask this question from Baseband Transmission in section Formatting and Baseband Modulation of Digital Communications

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The correct answer is (b) Bipolar RZ

To elaborate: In bipolar return to zero waveform ones and zeroes are represented by opposite level pulses one half bit wide pulses.

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