Question

If a carrier wave of amplitude $10mV$ is modulated by an audio signal of amplitude $2mV$, then amplitude of LSF or USF is given by

• A. $0.2mV$
• B. $0.5mV$
• C. $1mV$
• D. $2mV$

Answer 1

The correct option is C $1mV$

We have the modulation index as $m=\frac{E_m}{E_c}=\frac{2}{10}=0.2$.

Thus, we get the amplitude of LSF and USF as $\frac{m{E}_c}{2}=\frac{0.2\times 10}{2}=1mV$