Which one of the following scheme is a digital modulation technique ?

This question was previously asked in
ESE Electronics 2011 Paper 2: Official Paper
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  1.  Pulse code modulation
  2. On-off keying
  3. Pulse width modulation
  4. Delta modulation

Answer (Detailed Solution Below)

Option 2 : On-off keying
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Detailed Solution

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All given options are digital modulation schemes but the most appropriate option amongst them is ON-OFF keying which is also known as ASK.

Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave.

we can understand it by the given diagram

F1 Shraddha Neha 22.01.2021 D 4

Important Points

Analog Modulation:

In this scheme, input needs to be in analog (continuous format)

Digital modulation:

In this scheme, input needs to be in digital format.

F1 Shraddha Neha 22.01.2021 D 5

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