Which modulation technique is applied to a binary signal in figure (i) to achieve figure (ii)?
Which modulation technique is applied to a binary signal in figure (i) to achieve figure (ii)?
Figure (i): a binary digital signal (bits 0 1 0 1 1 0 0 1 0 0 1 0 0).
Figure (ii): a sine wave of constant amplitude whose frequency is higher where the input bit is 1 and lower where the input bit is 0.
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Correct answer: (B) Frequency modulation
Explanation
The carrier's frequency changes with the bit value (higher for 1, lower for 0) while the amplitude stays the same, which is frequency modulation (FSK).