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Pulse shaping is done by which block or system?

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Pulse shaping is done by which block or system?

(a) Encoder

(b) Baseband modulator

(c) Pulse code modulator

(d) Demodulator

I have been asked this question during an online interview.

The query is from Digital Communication Signal Processing in portion Signals and Spectra of Digital Communications

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Right choice is (c) Pulse code modulator

For explanation I would say: Pulse code modulator does filtering process to build pulses that occupy more than one bit time.

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