In amplitude modulation:
- AAmplitude remains constant but frequency changes.
- BBoth amplitude and frequency do not change.
- CBoth amplitude and frequency change.
- DAmplitude of the carrier wave changes according to the information signal.
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$A$ message signal of frequency $f_m$ is used to modulate a carrier of frequency $f_c$. If the sidebands are $f_1$ and $f_2$, then the ratio $\frac{f_c}{f_m}$ is:
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While tuning in a certain broadcast station with a receiver,we are actually
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