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What the main advantage of PCM?

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What the main advantage of PCM?

(a) can travel small distances

(b) higher bandwidth

(c) lower noise

(d) good reception

I have been asked this question by my school teacher while I was bunking the class.

Query is from Modulation of VSB Modulated Wave in division VSB Modulation of Analog Communications

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The correct option is (c) lower noise

The explanation: Pulse Code Modulation is a technique in which the amplitude of an analogue signal is converted to a binary value represented as a series of pulses. It is less prone to noise and can travel through long distances without loss of data.

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