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What type of digital modulation is widely used for digital data transmission?

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What type of digital modulation is widely used for digital data transmission?

(a) Pulse amplitude modulation

(b) Pulse width modulation

(c) Pulse position modulation

(d) Pulse code modulation

I have been asked this question during an interview.

The doubt is from Pulse Modulation topic in chapter Digital Communication Techniques of Avionics

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Right choice is (d) Pulse code modulation

To explain: The most widely used technique for digitizing information signals for electronic data transmission is pulse code modulation. It has uniform transmission quality and also can be used when the signal traffic is high.

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