Which modulation technique is applied to a binary signal in figure (A) to achieve figure (B)?
Which modulation technique is applied to a binary signal in figure (A) to achieve figure (B)?
Figure (A): a binary digital signal (bits 0 1 0 1 1 0 0 1 0 0 1 0 0).
Figure (B): a sinusoidal carrier that is present only during the intervals where the bit is 1 and absent where the bit is 0.
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Correct answer: (A) Amplitude modulation
Explanation
The carrier is sent for bit 1 and switched off for bit 0. This is on-off keying, a form of amplitude shift keying, i.e. amplitude modulation of the binary signal.